Zone Forecast Product
Issued by NWS St. Louis, MO
Issued by NWS St. Louis, MO
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753 FPUS53 KLSX 131828 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 128 PM CDT Thu Aug 13 2026 ILZ100-101-MOZ061-063-064-140200- 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 128 PM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Partly sunny. Hot with highs in the mid 90s. South winds around 5 mph. Heat index values up to 112. .TONIGHT...Mostly clear in the evening, then becoming partly cloudy. Humid with lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 111 early in the evening. .FRIDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Hot with highs in the upper 90s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 112. .FRIDAY NIGHT...Mostly clear. Humid with lows in the upper 70s. South winds around 5 mph. Heat index values up to 112 early in the evening. .SATURDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 110. .SATURDAY NIGHT...Mostly clear. Lows in the upper 70s. Heat index values up to 110 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 110. .SUNDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy with a slight chance of showers after midnight. Lows in the lower 70s. Chance of rain 50 percent. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 30 percent. .MONDAY NIGHT...Partly cloudy. Lows in the upper 60s. .TUESDAY AND TUESDAY NIGHT...Mostly clear. Highs in the upper 80s. Lows in the lower 70s. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100. $$ MOZ049-050-140200- Osage MO-Callaway MO- Including the city of Fulton 128 PM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Mostly sunny. Hot. Near steady temperature in the mid 90s. South winds 5 to 10 mph. Heat index values up to 108. .TONIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 106 early in the evening. .FRIDAY...Sunny, hot with highs in the upper 90s. South winds 5 to 10 mph. Heat index values up to 108 in the afternoon. .FRIDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 107 early in the evening. .SATURDAY...Mostly sunny. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 106 in the afternoon. .SATURDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 70s. Heat index values up to 105 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 105 in the afternoon. .SUNDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy with a slight chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 40 percent. Heat index values up to 100 early in the evening. .MONDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the mid 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy. Lows in the upper 60s. .TUESDAY AND TUESDAY NIGHT...Mostly clear. Highs in the upper 80s. Lows in the lower 70s. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. $$ MOZ042-140200- Audrain MO- Including the city of Mexico 128 PM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Mostly sunny. Highs in the lower 90s. South winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 106. .TONIGHT...Mostly clear. Humid with lows in the mid 70s. Southeast winds 5 to 10 mph. Heat index values up to 104 early in the evening. .FRIDAY...Sunny with highs in the lower 90s. South winds 5 to 10 mph. Heat index values up to 105 in the afternoon. .FRIDAY NIGHT...Mostly clear. 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 104 early in the evening. .SATURDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the lower 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent. Heat index values up to 103 in the afternoon. .SATURDAY NIGHT AND SUNDAY...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. .SUNDAY NIGHT...Mostly cloudy. A chance of showers and thunderstorms, mainly in the evening. Lows in the upper 60s. Chance of rain 40 percent. .MONDAY AND MONDAY NIGHT...Partly cloudy. Highs in the mid 80s. Lows in the mid 60s. .TUESDAY...Sunny. Highs in the mid 80s. .TUESDAY NIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 20 percent. .WEDNESDAY...Partly sunny. Highs in the upper 80s. $$ MOZ041-047-048-140200- Boone MO-Moniteau MO-Cole MO- Including the cities of Columbia and Jefferson City 128 PM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Sunny, hot with highs in the upper 90s. South winds 5 to 10 mph. Heat index values up to 108. .TONIGHT...Mostly clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 107 early in the evening. .FRIDAY...Sunny, hot with highs in the upper 90s. South winds 5 to 10 mph. Heat index values up to 109 in the afternoon. .FRIDAY NIGHT...Mostly clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 108 early in the evening. .SATURDAY...Mostly sunny. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 107 in the afternoon. .SATURDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 70s. Heat index values up to 105 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 105 in the afternoon. .SUNDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the upper 60s. .TUESDAY...Sunny. Highs around 90. .TUESDAY NIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 105 in the afternoon. $$ ILZ095>097-MOZ018-019-026-027-140200- Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Including the cities of Quincy, Mount Sterling, Pittsfield, and Hannibal 128 PM CDT Thu Aug 13 2026 .THIS AFTERNOON...Partly sunny. Highs in the lower 90s. Southeast winds 5 to 10 mph. Heat index values up to 107. .TONIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. East winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 107 early in the evening. .FRIDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Humid with highs in the lower 90s. Southeast winds around 5 mph. Chance of rain 20 percent. Heat index values up to 107 in the afternoon. .FRIDAY NIGHT...Mostly clear in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. Southeast winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 108 early in the evening. .SATURDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent. Heat index values up to 106 in the afternoon. .SATURDAY NIGHT...Partly cloudy in the evening, then mostly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .SUNDAY AND SUNDAY NIGHT...Mostly cloudy. A chance of showers and thunderstorms. Highs in the upper 80s. Lows in the upper 60s. Chance of rain 50 percent. Heat index values up to 100. .MONDAY...Mostly sunny. Highs in the mid 80s. .MONDAY NIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows in the mid 60s. .TUESDAY...Mostly sunny. Highs in the upper 80s. .TUESDAY NIGHT...Mostly clear in the evening, then partly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows around 70. Chance of rain 30 percent. .WEDNESDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20 percent. $$ MOZ034>036-140200- Monroe MO-Ralls MO-Pike MO- Including the city of Bowling Green 128 PM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Mostly sunny. Highs in the lower 90s. South winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 106. .TONIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. Southeast winds around 5 mph. Chance of rain 20 percent. Heat index values up to 107 early in the evening. .FRIDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Humid with highs in the mid 90s. South winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 107 in the afternoon. .FRIDAY NIGHT...Mostly clear. 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 107 early in the evening. .SATURDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 90s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent. Heat index values up to 105. .SATURDAY NIGHT...Partly cloudy. 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 AND SUNDAY NIGHT...Mostly cloudy. A chance of showers and thunderstorms. Highs around 90. Lows in the upper 60s. Chance of rain 40 percent. Heat index values up to 105. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 60s. .TUESDAY...Sunny. Highs in the upper 80s. .TUESDAY 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. .WEDNESDAY...Partly sunny. Highs around 90. $$ ILZ069-074-140200- Clinton IL-Washington IL- 128 PM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Partly sunny. Highs in the mid 90s. South winds around 5 mph. Heat index values up to 113. .TONIGHT...Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 110 early in the evening. .FRIDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Hot with highs in the mid 90s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 114 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 111 early in the evening. .SATURDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 112 in the afternoon. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Hot. Lows in the mid 70s. Highs in the mid 90s. Heat index values up to 110. .SUNDAY NIGHT...Partly cloudy. A chance of showers and 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. .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 upper 80s. Chance of rain 30 percent. .MONDAY NIGHT...Partly cloudy. Lows in the upper 60s. .TUESDAY AND TUESDAY NIGHT...Mostly clear. Highs in the upper 80s. Lows in the lower 70s. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 105 in the afternoon. $$ ILZ070-140200- Marion IL- Including the cities of Centralia and Salem 128 PM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Partly sunny. Near steady temperature around 90. South winds around 5 mph. Heat index values up to 107. .TONIGHT...Mostly clear in the evening, then becoming partly cloudy. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 105 early in the evening. .FRIDAY...Mostly sunny. A chance of showers and thunderstorms in the morning. Humid with highs in the mid 90s. Southeast winds around 5 mph, becoming southwest in the afternoon. Chance of rain 30 percent. Heat index values up to 109. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. Southeast winds around 5 mph. Heat index values up to 107 early in the evening. .SATURDAY...Sunny, hot with highs in the mid 90s. Southwest winds around 5 mph. Heat index values up to 108. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Hot. Lows in the mid 70s. Highs in the mid 90s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Lows in the lower 70s. Chance of rain 50 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 30 percent. .MONDAY NIGHT...Partly cloudy. Lows in the upper 60s. .TUESDAY...Sunny. Highs in the mid 80s. .TUESDAY NIGHT...Mostly clear. A slight chance of showers after midnight. Lows in the upper 60s. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100 in the afternoon. $$ MOZ074-084-085-099-140200- Saint Francois MO-Iron MO-Madison MO-Reynolds MO- Including the city of Farmington 128 PM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Partly sunny. Hot. Near steady temperature in the mid 90s. South winds around 5 mph. Heat index values up to 107. .TONIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 104 early in the evening. .FRIDAY...Sunny, hot with highs in the upper 90s. South winds around 5 mph. Heat index values up to 107. .FRIDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 105 early in the evening. .SATURDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Hot. Lows in the mid 70s. Highs in the upper 90s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Lows in the lower 70s. Chance of rain 30 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 50 percent. Heat index values up to 100. .MONDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the upper 60s. Chance of rain 20 percent. .TUESDAY AND TUESDAY NIGHT...Mostly clear. Highs around 90. Lows around 70. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100 in the afternoon. $$ MOZ051-060-140200- Montgomery MO-Warren MO- 128 PM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Mostly sunny. Hot with highs in the mid 90s. South winds around 5 mph. Heat index values up to 110. .TONIGHT...Mostly clear in the evening, then becoming partly cloudy. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 109 early in the evening. .FRIDAY...Sunny, hot with highs in the mid 90s. South winds around 5 mph. Heat index values up to 110 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 110 early in the evening. .SATURDAY...Mostly sunny. Hot with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 108 in the afternoon. .SATURDAY NIGHT...Mostly clear. Lows in the lower 70s. Heat index values up to 110 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 105 in the afternoon. .SUNDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy with a slight chance of showers after midnight. Lows in the upper 60s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy. Lows in the mid 60s. .TUESDAY AND TUESDAY NIGHT...Mostly clear. Highs in the upper 80s. Lows around 70. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100 in the afternoon. $$ MOZ052-140200- Lincoln MO- 128 PM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Mostly sunny. Highs in the mid 90s. South winds around 5 mph. Heat index values up to 110. .TONIGHT...Mostly clear in the evening, then becoming partly cloudy. Humid with lows in the mid 70s. Southeast winds around 5 mph. Heat index values up to 110 early in the evening. .FRIDAY...Sunny. A slight chance of showers and thunderstorms in the morning. Hot with highs in the mid 90s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 110 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 110 early in the evening. .SATURDAY...Mostly sunny. Hot with highs in the mid 90s. Southwest winds around 5 mph. Heat index values up to 108 in the afternoon. .SATURDAY NIGHT...Mostly clear. Lows in the mid 70s. Heat index values up to 110 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 105. .SUNDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy with a slight chance of showers after midnight. Lows around 70. Chance of rain 40 percent. Heat index values up to 105 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. .MONDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the upper 60s. .TUESDAY...Sunny. Highs in the upper 80s. .TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows in the lower 70s. Highs in the lower 90s. Heat index values up to 100. $$ ILZ058-059-098-099-140200- Greene IL-Macoupin IL-Calhoun IL-Jersey IL- 128 PM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Mostly sunny. Highs in the lower 90s. South winds around 5 mph. Heat index values up to 107. .TONIGHT...Partly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Humid with lows in the lower 70s. Southeast winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 107 early in the evening. .FRIDAY...Sunny. A slight chance of showers and thunderstorms in the morning. Humid with highs in the mid 90s. Southeast winds around 5 mph. Chance of rain 20 percent. Heat index values up to 109 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. Southeast winds around 5 mph. Heat index values up to 107 early in the evening. .SATURDAY...Mostly sunny. Humid with highs in the mid 90s. Southwest winds 5 to 10 mph. Heat index values up to 107. .SATURDAY 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. .SUNDAY...Mostly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 50 percent. Heat index values up to 100 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy. Lows in the mid 60s. .TUESDAY...Sunny. Highs in the upper 80s. .TUESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 20 percent. .WEDNESDAY...Partly sunny. A slight chance of showers in the morning. Highs in the lower 90s. Chance of rain 20 percent. $$ ILZ060-064-065-140200- Montgomery IL-Bond IL-Fayette IL- Including the cities of Litchfield and Vandalia 128 PM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Partly sunny with a slight chance of showers and thunderstorms. Near steady temperature in the upper 80s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 106. .TONIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. Southeast winds around 5 mph. Chance of rain 20 percent. Heat index values up to 106 early in the evening. .FRIDAY...Mostly sunny. A chance of showers and thunderstorms in the morning. Humid with highs in the lower 90s. Southeast winds around 5 mph, becoming south in the afternoon. Chance of rain 50 percent. Heat index values up to 109 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. Southeast winds around 5 mph. Heat index values up to 108 early in the evening. .SATURDAY...Sunny with highs in the mid 90s. Southwest winds around 5 mph. Heat index values up to 108. .SATURDAY NIGHT...Mostly clear. Lows in the mid 70s. Heat index values up to 105 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy with a slight chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 50 percent. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent. .MONDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 60s. .TUESDAY...Sunny. Highs in the mid 80s. .TUESDAY NIGHT...Mostly clear. A slight chance of showers after midnight. Lows in the upper 60s. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. A slight chance of showers in the morning. Highs around 90. Chance of rain 20 percent. $$ ILZ079-MOZ075-140200- Randolph IL-Sainte Genevieve MO- Including the cities of Chester and Sparta 128 PM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Partly sunny. Hot. Near steady temperature in the mid 90s. South winds around 5 mph. Heat index values up to 113. .TONIGHT...Mostly clear. Humid with lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 109 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the upper 90s. South winds around 5 mph. Heat index values up to 112. .FRIDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 110 early in the evening. .SATURDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 110 in the afternoon. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Hot. Lows in the mid 70s. Highs in the upper 90s. Heat index values up to 110. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms in the evening, then a slight chance of showers after midnight. Lows in the lower 70s. Chance of rain 30 percent. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Not as warm with highs in the upper 80s. Chance of rain 40 percent. .MONDAY NIGHT...Partly cloudy. Lows in the upper 60s. .TUESDAY AND TUESDAY NIGHT...Mostly clear. Highs around 90. Lows around 70. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100. $$ MOZ059-062-072-073-140200- Gasconade MO-Franklin MO-Crawford MO-Washington MO- Including the cities of Washington, Union, and Sullivan 128 PM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Mostly sunny. Hot. Near steady temperature in the mid 90s. South winds around 5 mph. Heat index values up to 109. .TONIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 107 early in the evening. .FRIDAY...Sunny, hot with highs in the upper 90s. South winds around 5 mph. Heat index values up to 109. .FRIDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 108 early in the evening. .SATURDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 107. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Hot. Lows in the mid 70s. Highs in the upper 90s. Heat index values up to 105. .SUNDAY NIGHT AND MONDAY...Partly cloudy. A chance of showers and thunderstorms. Lows in the lower 70s. Highs in the upper 80s. Chance of rain 40 percent. Heat index values up to 105. .MONDAY NIGHT...Partly cloudy. Lows in the upper 60s. .TUESDAY AND TUESDAY NIGHT...Mostly clear. Highs around 90. Lows in the lower 70s. .WEDNESDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 100. $$ ILZ102-MOZ065-140200- Monroe IL-Jefferson MO- 128 PM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .THIS AFTERNOON...Partly sunny. Hot. Near steady temperature in the mid 90s. South winds around 5 mph. Heat index values up to 113. .TONIGHT...Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 110 early in the evening. .FRIDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Hot with highs in the upper 90s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 113. .FRIDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 111 early in the evening. .SATURDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 111. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Hot. Lows in the mid 70s. Highs in the upper 90s. Heat index values up to 110. .SUNDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy after midnight. Lows in the lower 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Not as warm with highs in the upper 80s. Chance of rain 30 percent. .MONDAY NIGHT...Partly cloudy. Lows in the upper 60s. .TUESDAY AND TUESDAY NIGHT...Mostly clear. Highs around 90. Lows in the lower 70s. .WEDNESDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 105 in the afternoon. $$