Zone Forecast Product
Issued by NWS St. Louis, MO
Issued by NWS St. Louis, MO
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550 FPUS53 KLSX 102239 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 538 PM CDT Mon Aug 10 2026 ILZ100-101-MOZ061-063-064-110600- Madison IL-Saint Clair IL-Saint Charles MO-Saint Louis MO- Saint Louis City MO- Including the cities of Alton, Edwardsville, Belleville, Cahokia, Saint Charles, and Saint Louis 538 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy. Lows in the upper 70s. South winds 5 to 10 mph. Heat index values up to 105 early this evening. .TUESDAY...Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 110. .TUESDAY NIGHT...Partly cloudy. Lows in the upper 70s. Southwest winds around 5 mph. Heat index values up to 111 early in the evening. .WEDNESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 106. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 104 early in the evening. .THURSDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 110. .THURSDAY NIGHT...Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the mid 70s. Chance of rain 50 percent. Heat index values up to 105 early in the evening. .FRIDAY...Partly sunny. Highs in the lower 90s. Heat index values up to 105 in the afternoon. .FRIDAY NIGHT...Partly cloudy. Lows in the mid 70s. Heat index values up to 105 early in the evening. .SATURDAY AND SATURDAY NIGHT...Mostly clear. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SUNDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the lower 70s. Chance of rain 30 percent. Heat index values up to 100 early in the evening. .MONDAY...Partly sunny. A slight chance of showers in the morning. Highs in the mid 80s. Chance of rain 20 percent. $$ MOZ049-050-110600- Osage MO-Callaway MO- Including the city of Fulton 538 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy this evening, then clearing. Lows in the upper 70s. South winds 5 to 10 mph. Heat index values up to 102 early this evening. .TUESDAY...Sunny, hot with highs in the mid 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 106. .TUESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 107 early in the evening. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the mid 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent. Heat index values up to 105. .WEDNESDAY NIGHT...Partly cloudy. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 103 early in the evening. .THURSDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 105. .THURSDAY NIGHT...Partly cloudy with a slight chance of thunderstorms. A chance of showers, mainly in the evening. Lows in the mid 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs in the lower 90s. Lows in the mid 70s. Heat index values up to 105. .SATURDAY...Sunny, hot with highs in the mid 90s. .SATURDAY NIGHT...Mostly clear. A slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 100 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 90s. Chance of rain 20 percent. .SUNDAY NIGHT...Partly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the lower 70s. Chance of rain 40 percent. .MONDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 20 percent. $$ MOZ042-110600- Audrain MO- Including the city of Mexico 538 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy this evening, then clearing. Lows in the upper 70s. South winds 5 to 10 mph. Heat index values up to 100 early this evening. .TUESDAY...Sunny. Highs in the lower 90s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Heat index values up to 103. .TUESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 70s. Southwest winds 5 to 10 mph. Heat index values up to 104 early in the evening. .WEDNESDAY...Mostly sunny. A chance of showers and thunderstorms in the morning. Humid with highs around 90. Southwest winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 40 percent. Heat index values up to 100. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 100 early in the evening. .THURSDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 50 percent. .FRIDAY...Mostly sunny. Highs in the upper 80s. .FRIDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. .SATURDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100. .SATURDAY NIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 100 early in the evening. .SUNDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent. .SUNDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 60s. Chance of rain 40 percent. .MONDAY...Mostly cloudy with a slight chance of showers in the morning, then partly sunny in the afternoon. Highs around 80. Chance of rain 20 percent. $$ MOZ041-047-048-110600- Boone MO-Moniteau MO-Cole MO- Including the cities of Columbia and Jefferson City 538 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy this evening, then clearing. Lows in the upper 70s. South winds 5 to 10 mph. Heat index values up to 102 early this evening. .TUESDAY...Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph with gusts up to 25 mph. Heat index values up to 107. .TUESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the upper 70s. Southwest winds around 5 mph. Heat index values up to 108 early in the evening. .WEDNESDAY...Sunny. A slight chance of showers and thunderstorms in the morning. Hot with highs in the mid 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent. Heat index values up to 107. .WEDNESDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 106 early in the evening. .THURSDAY...Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 105 in the afternoon. .THURSDAY NIGHT...Partly cloudy with a slight chance of thunderstorms. A chance of showers, mainly in the evening. Lows in the mid 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 105 in the afternoon. .FRIDAY NIGHT...Partly cloudy in the evening, then mostly clear with a slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 100 early in the evening. .SATURDAY...Sunny, hot with highs in the mid 90s. Heat index values up to 105 in the afternoon. .SATURDAY NIGHT...Mostly clear. A slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 100. .SUNDAY NIGHT...Partly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the lower 70s. Chance of rain 40 percent. .MONDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 20 percent. $$ ILZ095>097-MOZ018-019-026-027-034>036-110600- Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Monroe MO-Ralls MO-Pike MO- Including the cities of Quincy, Mount Sterling, Pittsfield, Hannibal, and Bowling Green 538 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy this evening, then clearing. Lows in the upper 70s. South winds 5 to 10 mph. Heat index values up to 100 early this evening. .TUESDAY...Mostly sunny. Isolated showers and thunderstorms in the morning. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph with gusts up to 25 mph. Chance of rain 20 percent. Heat index values up to 107 in the afternoon. .TUESDAY NIGHT...Partly cloudy with isolated showers and thunderstorms. Humid with lows in the mid 70s. Southwest winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 108 early in the evening. .WEDNESDAY...Mostly sunny. A chance of showers and thunderstorms in the morning. Humid with highs around 90. Southwest winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 50 percent. Heat index values up to 102. .WEDNESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. Southeast winds around 5 mph. Chance of rain 50 percent. Heat index values up to 102 early in the evening. .THURSDAY...Partly sunny. Showers and thunderstorms likely, mainly in the morning. Highs in the upper 80s. Chance of rain 70 percent. Heat index values up to 100 in the afternoon. .THURSDAY NIGHT...Mostly cloudy with a chance of thunderstorms. Showers likely. Lows around 70. Chance of rain 70 percent. .FRIDAY...Mostly cloudy with a slight chance of showers and thunderstorms in the morning, then mostly sunny in the afternoon. Highs in the upper 80s. Chance of rain 20 percent. .FRIDAY NIGHT THROUGH SATURDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 70s. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 100. .SUNDAY...Mostly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the upper 80s. Chance of rain 30 percent. .SUNDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 60s. Chance of rain 40 percent. .MONDAY...Partly sunny. A slight chance of showers in the morning. Highs in the upper 70s. Chance of rain 20 percent. $$ ILZ069-074-110600- Clinton IL-Washington IL- 538 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy. Lows in the upper 70s. South winds 5 to 10 mph. Heat index values up to 103 early this evening. .TUESDAY...Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 111. .TUESDAY NIGHT...Partly cloudy. Isolated showers and thunderstorms after midnight. Humid with lows in the mid 70s. Southwest winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 110 early in the evening. .WEDNESDAY...Mostly sunny. Isolated showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Humid with highs in the mid 90s. Southwest winds around 5 mph. Chance of rain 40 percent. Heat index values up to 109. .WEDNESDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .THURSDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 110. .THURSDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. A slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the mid 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .FRIDAY...Partly sunny. Highs in the lower 90s. Heat index values up to 105 in the afternoon. .FRIDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 70s. Heat index values up to 105 early in the evening. .SATURDAY AND SATURDAY NIGHT...Mostly clear. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SUNDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 100 early in the evening. .MONDAY...A slight chance of thunderstorms in the morning. Partly sunny with a slight chance of showers. Highs in the mid 80s. Chance of rain 20 percent. $$ ILZ070-110600- Marion IL- Including the cities of Centralia and Salem 538 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy. Lows in the upper 70s. South winds 5 to 10 mph. Heat index values up to 102 early this evening. .TUESDAY...Mostly sunny. Hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 107. .TUESDAY NIGHT...Partly cloudy. Isolated showers and thunderstorms in the evening. Lows in the mid 70s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 106 early in the evening. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 103. .WEDNESDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. .THURSDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105. .THURSDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. A chance of showers. A chance of thunderstorms, mainly in the evening. Lows in the lower 70s. Chance of rain 50 percent. Heat index values up to 100 early in the evening. .FRIDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs around 90. Chance of rain 20 percent. Heat index values up to 100. .FRIDAY NIGHT...Partly cloudy in the evening, then mostly clear with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. .SATURDAY AND SATURDAY NIGHT...Mostly clear. Highs in the lower 90s. Lows in the mid 70s. Heat index values up to 105. .SUNDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100. .SUNDAY NIGHT...A slight chance of thunderstorms in the evening. Partly cloudy with a slight chance of showers. Lows in the lower 70s. Chance of rain 20 percent. .MONDAY...Partly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. $$ MOZ074-084-085-099-110600- Saint Francois MO-Iron MO-Madison MO-Reynolds MO- Including the city of Farmington 538 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Gusts up to 20 mph after midnight. .TUESDAY...Sunny, hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 104. .TUESDAY NIGHT...Mostly clear. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 103 early in the evening. .WEDNESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the mid 90s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 104. .WEDNESDAY NIGHT...Partly cloudy. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 100 early in the evening. .THURSDAY THROUGH FRIDAY...Partly cloudy. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .FRIDAY NIGHT THROUGH SUNDAY...Mostly clear. Hot. Lows in the mid 70s. Highs in the mid 90s. Heat index values up to 105. .SUNDAY NIGHT AND MONDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the lower 70s. Highs in the upper 80s. Chance of rain 20 percent. Heat index values up to 100. $$ MOZ051-060-110600- Montgomery MO-Warren MO- 538 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy this evening, then clearing. Lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 100 early this evening. .TUESDAY...Sunny with highs in the mid 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 108. .TUESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 109 early in the evening. .WEDNESDAY...Mostly sunny. A chance of showers and thunderstorms in the morning. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 105. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .THURSDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105 in the afternoon. .THURSDAY NIGHT...Partly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Lows in the lower 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs in the lower 90s. Lows in the lower 70s. Heat index values up to 105. .SATURDAY...Sunny. Highs in the mid 90s. Heat index values up to 105 in the afternoon. .SATURDAY NIGHT...Mostly clear. A slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 100. .SUNDAY NIGHT...Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 60s. Chance of rain 40 percent. .MONDAY...Partly sunny. A slight chance of showers in the morning. Cooler with highs in the lower 80s. Chance of rain 20 percent. $$ MOZ052-110600- Lincoln MO- 538 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy this evening, then clearing. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 102 early this evening. .TUESDAY...Sunny, hot with highs in the mid 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 108. .TUESDAY NIGHT...Partly cloudy. Humid with lows in the upper 70s. Southwest winds around 5 mph. Heat index values up to 110 early in the evening. .WEDNESDAY...Mostly sunny. A chance of showers and thunderstorms, mainly in the morning. Humid with highs in the lower 90s. Southwest winds around 5 mph. Chance of rain 40 percent. Heat index values up to 105. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .THURSDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105. .THURSDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers. A chance of thunderstorms, mainly in the evening. Lows in the lower 70s. Chance of rain 50 percent. Heat index values up to 105 early in the evening. .FRIDAY THROUGH SATURDAY...Partly cloudy. Highs in the lower 90s. Lows in the lower 70s. Heat index values up to 105. .SATURDAY NIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .SUNDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 100. .SUNDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with a chance of showers after midnight. Lows around 70. Chance of rain 40 percent. .MONDAY...Partly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. $$ ILZ058-059-098-099-110600- Greene IL-Macoupin IL-Calhoun IL-Jersey IL- 538 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 101 early this evening. .TUESDAY...Sunny with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 108. .TUESDAY NIGHT...Partly cloudy. Isolated showers and thunderstorms in the evening. Humid with lows in the mid 70s. Southwest winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 107 early in the evening. .WEDNESDAY...Mostly sunny. A chance of showers and thunderstorms, mainly in the morning. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 102. .WEDNESDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Humid with lows in the lower 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 101 early in the evening. .THURSDAY...Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Highs around 90. Chance of rain 40 percent. Heat index values up to 100. .THURSDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows around 70. Chance of rain 50 percent. Heat index values up to 100 early in the evening. .FRIDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20 percent. .FRIDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. .SATURDAY...Sunny. Highs in the lower 90s. Heat index values up to 105. .SATURDAY NIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 100 early in the evening. .SUNDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs around 90. Chance of rain 20 percent. .SUNDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of thunderstorms in the evening. A chance of showers. Lows in the upper 60s. Chance of rain 40 percent. .MONDAY...Partly sunny with a 20 percent chance of showers. Highs in the lower 80s. $$ ILZ060-064-065-110600- Montgomery IL-Bond IL-Fayette IL- Including the cities of Litchfield and Vandalia 538 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 102 early this evening. .TUESDAY...Mostly sunny. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Heat index values up to 108. .TUESDAY NIGHT...Partly cloudy. Scattered showers and thunderstorms, mainly in the evening. Humid with lows in the mid 70s. Southwest winds around 5 mph. Chance of rain 50 percent. Heat index values up to 107 early in the evening. .WEDNESDAY...Mostly sunny with a chance of showers and thunderstorms. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 104. .WEDNESDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Humid with lows in the lower 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 100 early in the evening. .THURSDAY...Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Highs in the upper 80s. Chance of rain 40 percent. Heat index values up to 105. .THURSDAY NIGHT...Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the lower 70s. Chance of rain 70 percent. Heat index values up to 100 early in the evening. .FRIDAY...Partly sunny. A chance of showers with a slight chance of thunderstorms in the morning. Highs in the upper 80s. Chance of rain 50 percent. .FRIDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. .SATURDAY AND SATURDAY NIGHT...Mostly clear. Highs in the lower 90s. Lows in the lower 70s. Heat index values up to 105. .SUNDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs around 90. Chance of rain 20 percent. Heat index values up to 100. .SUNDAY NIGHT...A slight chance of thunderstorms in the evening. Partly cloudy with a chance of showers. Lows in the upper 60s. Chance of rain 40 percent. .MONDAY...Partly sunny with a 20 percent chance of showers. Highs in the lower 80s. $$ ILZ079-110600- Randolph IL- Including the cities of Chester and Sparta 538 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Mostly clear this evening, then becoming partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 105 early this evening. .TUESDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 111. .TUESDAY NIGHT...Partly cloudy. Humid with lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 110 early in the evening. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 109. .WEDNESDAY NIGHT...Partly cloudy. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 106 early in the evening. .THURSDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Hot with highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 110 in the afternoon. .THURSDAY NIGHT...Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the mid 70s. Chance of rain 30 percent. Heat index values up to 105 early in the evening. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs in the mid 90s. Lows in the lower 70s. Heat index values up to 105. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 105. .SUNDAY NIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Not as warm with highs in the upper 80s. Chance of rain 20 percent. $$ MOZ075-110600- Sainte Genevieve MO- 538 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Mostly clear this evening, then becoming partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 103 early this evening. .TUESDAY...Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 108. .TUESDAY NIGHT...Mostly clear. Lows in the mid 70s. Southwest winds 5 to 10 mph. Heat index values up to 107 early in the evening. .WEDNESDAY...Mostly sunny. A chance of showers and thunderstorms, mainly in the morning. Hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Chance of rain 30 percent. Heat index values up to 107. .WEDNESDAY NIGHT...Partly cloudy. Lows in the mid 70s. Southwest winds 5 to 10 mph. Heat index values up to 104 early in the evening. .THURSDAY AND THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms. Hot. Highs in the mid 90s. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 110. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 105. .SUNDAY NIGHT AND MONDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the lower 70s. Highs in the upper 80s. Chance of rain 20 percent. Heat index values up to 105. $$ MOZ059-062-110600- Gasconade MO-Franklin MO- Including the cities of Washington, Union, and Sullivan 538 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy this evening, then becoming mostly clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 102 early this evening. .TUESDAY...Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 107. .TUESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 109 early in the evening. .WEDNESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the mid 90s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 106. .WEDNESDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 105 early in the evening. .THURSDAY...Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 105. .THURSDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SATURDAY AND SATURDAY NIGHT...Mostly clear. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SUNDAY...Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the lower 70s. Chance of rain 40 percent. Heat index values up to 100 early in the evening. .MONDAY...Partly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Not as warm with highs in the mid 80s. Chance of rain 20 percent. $$ MOZ072-073-110600- Crawford MO-Washington MO- 538 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Mostly clear. Lows in the upper 70s. South winds around 5 mph. Gusts up to 20 mph after midnight. Heat index values up to 102 early this evening. .TUESDAY...Sunny, hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 105. .TUESDAY NIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows in the upper 70s. Southwest winds around 5 mph. Heat index values up to 104 early in the evening. .WEDNESDAY...Sunny. A chance of showers and thunderstorms, mainly in the morning. Hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Chance of rain 30 percent. Heat index values up to 103. .WEDNESDAY NIGHT...Partly cloudy. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 100 early in the evening. .THURSDAY...Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 105. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 100 early in the evening. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SATURDAY AND SATURDAY NIGHT...Mostly clear. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SUNDAY...Mostly sunny. Hot with highs in the mid 90s. .SUNDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs in the mid 80s. Chance of rain 20 percent. $$ ILZ102-MOZ065-110600- Monroe IL-Jefferson MO- 538 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .TONIGHT...Partly cloudy. Lows in the upper 70s. South winds 5 to 10 mph. Heat index values up to 102 early this evening. .TUESDAY...Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 110. .TUESDAY NIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows in the upper 70s. Southwest winds around 5 mph. Heat index values up to 110 early in the evening. .WEDNESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the mid 90s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 107. .WEDNESDAY NIGHT...Partly cloudy. Humid with lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 105 early in the evening. .THURSDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Hot with highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 110. .THURSDAY NIGHT...Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the mid 70s. Chance of rain 30 percent. Heat index values up to 105 early in the evening. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SATURDAY AND SATURDAY NIGHT...Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 110. .SUNDAY...Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Not as warm with highs in the mid 80s. Chance of rain 20 percent. $$