Zone Forecast Product
Issued by NWS St. Louis, MO
Issued by NWS St. Louis, MO
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039 FPUS53 KLSX 110318 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 1018 PM CDT Mon Aug 10 2026 ILZ100-101-MOZ061-063-064-111100- 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 1018 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Partly cloudy. Lows in the upper 70s. South winds 5 to 10 mph. .TUESDAY...Mostly sunny. A slight chance of showers in the morning. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent. Heat index values up to 111. .TUESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the upper 70s. Southwest winds 5 to 10 mph. Heat index values up to 109 early in the evening. .WEDNESDAY...Sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 110. .WEDNESDAY NIGHT...Mostly clear with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 50 percent. Heat index values up to 109 early in the evening. .THURSDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 110 in the afternoon. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms 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. A slight chance of showers in the morning. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105 in the afternoon. .FRIDAY NIGHT AND SATURDAY...Partly cloudy. Hot. Lows in the mid 70s. Highs in the upper 90s. Heat index values up to 110. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Hot. Lows in the upper 70s. Highs in the mid 90s. Heat index values up to 110. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 30 percent. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20 percent. $$ MOZ049-050-111100- Osage MO-Callaway MO- Including the city of Fulton 1018 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the upper 70s. South winds 5 to 10 mph. .TUESDAY...Sunny, hot with highs in the mid 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 107 in the afternoon. .TUESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 70s. Southwest winds 5 to 10 mph. Heat index values up to 106 early in the evening. .WEDNESDAY...Mostly sunny. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 108 in the afternoon. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 106 early in the evening. .THURSDAY...Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 105 in the afternoon. .THURSDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the mid 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 30 percent. Heat index values up to 100 early in the evening. .MONDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent. $$ MOZ042-111100- Audrain MO- Including the city of Mexico 1018 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the upper 70s. South winds 5 to 10 mph. Gusts up to 25 mph. .TUESDAY...Mostly sunny. Highs in the lower 90s. Southwest winds 10 to 15 mph with gusts up to 25 mph. Heat index values up to 104. .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. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Heat index values up to 104. .WEDNESDAY NIGHT...Partly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Humid with lows in the mid 70s. South winds 5 to 10 mph, becoming east after midnight. Chance of rain 40 percent. Heat index values up to 103 early in the evening. .THURSDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs around 90. Chance of rain 40 percent. Heat index values up to 100. .THURSDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 50 percent. .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 AND SATURDAY...Partly cloudy. Lows in the lower 70s. Highs in the lower 90s. Heat index values up to 100. .SATURDAY NIGHT...Mostly clear. Lows in the mid 70s. Heat index values up to 100 early in the evening. .SUNDAY...Mostly sunny. Highs around 90. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 30 percent. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 80s. Chance of rain 20 percent. $$ MOZ041-047-048-111100- Boone MO-Moniteau MO-Cole MO- Including the cities of Columbia and Jefferson City 1018 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the upper 70s. South winds 5 to 10 mph. .TUESDAY...Sunny, hot with highs in the mid 90s. Southwest winds 5 to 10 mph with gusts up to 25 mph. Heat index values up to 108 in the afternoon. .TUESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the upper 70s. Southwest winds around 5 mph. Heat index values up to 107 early in the evening. .WEDNESDAY...Mostly sunny. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 109 in the afternoon. .WEDNESDAY NIGHT...Mostly clear in the evening, then partly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the upper 70s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 107 early in the evening. .THURSDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Hot with highs in the upper 90s. Chance of rain 20 percent. Heat index values up to 110 in the afternoon. .THURSDAY 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 mid 70s. Chance of rain 50 percent. Heat index values up to 105 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 upper 90s. Lows in the upper 70s. Heat index values up to 105. .SUNDAY...Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 105 in the afternoon. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 30 percent. Heat index values up to 100 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20 percent. $$ ILZ095>097-MOZ018-019-026-027-034>036-111100- 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 1018 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the upper 70s. South winds 5 to 10 mph with gusts up to 25 mph. .TUESDAY...Mostly sunny. A slight chance of showers in the morning. Humid with highs in the mid 90s. Southwest winds 10 to 15 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 a slight chance of showers and thunderstorms in the evening, then mostly clear after midnight. Humid with lows in the mid 70s. Southwest winds 5 to 10 mph with gusts up to 20 mph, becoming south after midnight. Chance of rain 20 percent. Heat index values up to 108 early in the evening. .WEDNESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the lower 90s. South winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 106 in the afternoon. .WEDNESDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. East winds around 5 mph. Chance of rain 50 percent. Heat index values up to 105 early in the evening. .THURSDAY...Mostly cloudy in the morning, then becoming partly sunny. A chance of thunderstorms. Showers 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. Lows around 70. Chance of rain 80 percent. Heat index values up to 100 early in the evening. .FRIDAY...Mostly cloudy with a chance of showers and thunderstorms in the morning, then partly sunny in the afternoon. Highs in the upper 80s. Chance of rain 50 percent. .FRIDAY NIGHT AND SATURDAY...Partly cloudy. 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 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. A slight chance of showers and thunderstorms in the morning. Highs around 90. Chance of rain 20 percent. Heat index values up to 100. .SUNDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 40 percent. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 80s. Chance of rain 20 percent. $$ ILZ069-074-111100- Clinton IL-Washington IL- 1018 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Partly cloudy. Lows in the upper 70s. South winds 5 to 10 mph. .TUESDAY...Sunny. A slight chance of showers in the morning. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 113 in the afternoon. .TUESDAY NIGHT...Partly cloudy in the evening, then mostly clear with a slight chance of showers 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 109 early in the evening. .WEDNESDAY...Sunny. A chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Southwest winds around 5 mph. Chance of rain 30 percent. Heat index values up to 113 in the afternoon. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. Southwest winds around 5 mph. Chance of rain 50 percent. Heat index values up to 108 early in the evening. .THURSDAY...Mostly sunny with a slight chance of thunderstorms. A slight chance of showers in the morning, then a chance of showers in the afternoon. Highs in the mid 90s. Chance of rain 50 percent. Heat index values up to 110 in the afternoon. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms 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. 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 in the afternoon. .FRIDAY NIGHT...Partly cloudy. Lows in the mid 70s. Heat index values up to 105 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 110. .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. $$ ILZ070-111100- Marion IL- Including the cities of Centralia and Salem 1018 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Partly cloudy. Lows in the upper 70s. South winds 5 to 10 mph. .TUESDAY...Mostly sunny. A chance of showers with a slight chance of thunderstorms 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 108 in the afternoon. .TUESDAY NIGHT...Partly cloudy in the evening, then becoming mostly clear. A slight chance of thunderstorms. A chance of showers, mainly in the evening. Lows in the mid 70s. Southwest winds 5 to 10 mph. Chance of rain 30 percent. Heat index values up to 104 early in the evening. .WEDNESDAY...Mostly sunny. A chance of showers and thunderstorms in the afternoon. Humid with highs in the mid 90s. Southwest winds around 5 mph. Chance of rain 30 percent. Heat index values up to 108. .WEDNESDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Humid with lows in the mid 70s. South winds around 5 mph, becoming west after midnight. Chance of rain 50 percent. Heat index values up to 103 early in the evening. .THURSDAY AND THURSDAY NIGHT...Mostly cloudy. A chance of showers and thunderstorms. Highs in the lower 90s. Lows in the lower 70s. Chance of rain 50 percent. Heat index values up to 105. .FRIDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20 percent. Heat index values up to 100 in the afternoon. .FRIDAY NIGHT AND SATURDAY...Partly cloudy. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 105. .SATURDAY NIGHT AND SUNDAY...Mostly clear. 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. $$ MOZ074-084-085-099-111100- Saint Francois MO-Iron MO-Madison MO-Reynolds MO- Including the city of Farmington 1018 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. .TUESDAY...Sunny, hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 105. .TUESDAY NIGHT...Mostly clear. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 103 early in the evening. .WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 107. .WEDNESDAY NIGHT...Partly cloudy. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 103 early in the evening. .THURSDAY THROUGH FRIDAY...Partly cloudy. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .FRIDAY NIGHT THROUGH SUNDAY...Mostly clear. Hot. Lows in the mid 70s. Highs in the upper 90s. Heat index values up to 105. .SUNDAY NIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 100 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 30 percent. Heat index values up to 100. $$ MOZ051-060-111100- Montgomery MO-Warren MO- 1018 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the mid 70s. South winds 5 to 10 mph. .TUESDAY...Mostly 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 109 in the afternoon. .TUESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 108 early in the evening. .WEDNESDAY...Sunny, hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 108. .WEDNESDAY NIGHT...Partly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 108 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 slight chance of showers and thunderstorms in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Lows in the lower 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 AND SATURDAY...Partly cloudy. Hot. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 105. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the mid 70s. Highs in the mid 90s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 30 percent. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 20 percent. $$ MOZ052-111100- Lincoln MO- 1018 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the upper 70s. South winds around 5 mph. Gusts up to 20 mph. .TUESDAY...Mostly 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 110 in the afternoon. .TUESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 108 early in the evening. .WEDNESDAY...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 109. .WEDNESDAY NIGHT...Partly cloudy in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. South winds around 5 mph, becoming east after midnight. Chance of rain 40 percent. Heat index values up to 108 early in the evening. .THURSDAY...Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Highs in the lower 90s. Chance of rain 40 percent. Heat index values up to 105 in the afternoon. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 50 percent. Heat index values up to 105 early in the evening. .FRIDAY...Partly 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 in the afternoon. .FRIDAY NIGHT AND SATURDAY...Partly cloudy. Hot. Lows in the mid 70s. Highs in the mid 90s. Heat index values up to 105. .SATURDAY NIGHT...Mostly clear. Lows in the mid 70s. Heat index values up to 105 early in the evening. .SUNDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 30 percent. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 20 percent. $$ ILZ058-059-098-099-111100- Greene IL-Macoupin IL-Calhoun IL-Jersey IL- 1018 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Partly cloudy. Lows in the mid 70s. South winds 5 to 10 mph. .TUESDAY...Mostly sunny. A slight chance of showers in the morning, then a chance of showers in the afternoon. Hot with highs in the mid 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 30 percent. Heat index values up to 109 in the afternoon. .TUESDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly clear after midnight. Humid with lows in the mid 70s. Southwest winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 107 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 106. .WEDNESDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with 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 105 early in the evening. .THURSDAY...Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Highs in the lower 90s. Chance of rain 50 percent. Heat index values up to 100. .THURSDAY NIGHT...Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows around 70. Chance of rain 70 percent. Heat index values up to 100 early in the evening. .FRIDAY...Mostly cloudy with a slight chance of showers and thunderstorms in the morning, then partly sunny in the afternoon. Highs in the upper 80s. Chance of rain 20 percent. .FRIDAY NIGHT AND SATURDAY...Partly cloudy. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 105. .SATURDAY NIGHT...Mostly clear. Lows in the mid 70s. Heat index values up to 105 early in the evening. .SUNDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 30 percent. Heat index values up to 100 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 20 percent. $$ ILZ060-064-065-111100- Montgomery IL-Bond IL-Fayette IL- Including the cities of Litchfield and Vandalia 1018 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Partly cloudy. A slight chance of showers and thunderstorms. Near steady temperature in the upper 70s. South winds 5 to 10 mph. Chance of rain 20 percent. .TUESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Humid with highs in the mid 90s. Southwest winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 109 in the afternoon. .TUESDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly clear with a slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. Southwest winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 106 early in the evening. .WEDNESDAY...Mostly sunny. A chance of showers and thunderstorms in the afternoon. Humid with highs in the lower 90s. Southwest winds around 5 mph. Chance of rain 50 percent. Heat index values up to 107. .WEDNESDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Humid with lows in the lower 70s. Southeast winds around 5 mph. Chance of rain 50 percent. Heat index values up to 103 early in the evening. .THURSDAY...Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Highs around 90. Chance of rain 50 percent. Heat index values up to 105 in the afternoon. .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 slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20 percent. .FRIDAY NIGHT AND SATURDAY...Partly cloudy. Lows in the lower 70s. Highs in the lower 90s. Heat index values up to 105. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the mid 70s. Highs in the lower 90s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 30 percent. Heat index values up to 100 early in the evening. .MONDAY...Mostly 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. $$ ILZ079-111100- Randolph IL- Including the cities of Chester and Sparta 1018 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. .TUESDAY...Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 112 in the afternoon. .TUESDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. Southwest winds 5 to 10 mph. Heat index values up to 109 early in the evening. .WEDNESDAY...Sunny. A chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. Southwest winds around 5 mph. Chance of rain 30 percent. Heat index values up to 113 in the afternoon. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. Southwest winds around 5 mph. Chance of rain 30 percent. Heat index values up to 109 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...Mostly sunny. A slight chance of showers in the morning. Highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 110 in the afternoon. .FRIDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 70s. Heat index values up to 105 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 110. .SUNDAY NIGHT AND MONDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the lower 70s. Highs around 90. Chance of rain 20 percent. Heat index values up to 105. $$ MOZ075-111100- Sainte Genevieve MO- 1018 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the mid 70s. South winds 5 to 10 mph. .TUESDAY...Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 109 in the afternoon. .TUESDAY NIGHT...Mostly clear. Lows in the upper 70s. Southwest winds 5 to 10 mph. Heat index values up to 107 early in the evening. .WEDNESDAY...Sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 111 in the afternoon. .WEDNESDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 70s. Southwest winds 5 to 10 mph. Heat index values up to 107 early in the evening. .THURSDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. Chance of rain 20 percent. Heat index values up to 110 in the afternoon. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy. Hot. Lows in the mid 70s. Highs in the mid 90s. Heat index values up to 110. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the upper 70s. Heat index values up to 110. .SUNDAY NIGHT AND MONDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the mid 70s. Highs around 90. Chance of rain 20 percent. Heat index values up to 105. $$ MOZ059-062-111100- Gasconade MO-Franklin MO- Including the cities of Washington, Union, and Sullivan 1018 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the upper 70s. South winds around 5 mph. Gusts up to 20 mph. .TUESDAY...Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 109 in the afternoon. .TUESDAY NIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 108 early in the evening. .WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 109. .WEDNESDAY NIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 108 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 110. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 30 percent. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent. $$ MOZ072-073-111100- Crawford MO-Washington MO- 1018 PM CDT Mon Aug 10 2026 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the upper 70s. South winds around 5 mph. Gusts up to 20 mph. .TUESDAY...Sunny, hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 106. .TUESDAY NIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows in the upper 70s. Southwest winds around 5 mph. Heat index values up to 103 early in the evening. .WEDNESDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 107. .WEDNESDAY NIGHT...Partly cloudy. Lows in the upper 70s. Southwest winds around 5 mph. Heat index values up to 104 early in the evening. .THURSDAY THROUGH FRIDAY NIGHT...Partly cloudy. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the upper 70s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 100 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs around 90. Chance of rain 30 percent. $$ ILZ102-MOZ065-111100- Monroe IL-Jefferson MO- 1018 PM CDT Mon Aug 10 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM CDT WEDNESDAY... .OVERNIGHT...Mostly clear. Lows in the upper 70s. South winds around 5 mph. .TUESDAY...Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 112. .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 109 early in the evening. .WEDNESDAY...Sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 112. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 108 early in the evening. .THURSDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. Chance of rain 20 percent. Heat index values up to 110 in the afternoon. .THURSDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of showers and thunderstorms. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 110 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 110. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 110. .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. $$