Zone Forecast Product
Issued by NWS St. Louis, MO
Issued by NWS St. Louis, MO
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625 FPUS53 KLSX 130628 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 127 AM CDT Thu Aug 13 2026 ILZ100-101-MOZ061-063-064-131400- 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 127 AM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Near steady temperature in the mid 70s. Southeast winds around 5 mph. Chance of rain 30 percent. .THURSDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Hot with highs in the mid 90s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 114 in the afternoon. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Humid with lows in the mid 70s. Southeast winds around 5 mph. Chance of rain 20 percent. Heat index values up to 113 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the upper 90s. South winds around 5 mph. Heat index values up to 114 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the upper 70s. South winds around 5 mph. Heat index values up to 114 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the upper 70s. Heat index values up to 110. .SUNDAY NIGHT...Mostly clear in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows in the mid 70s. Chance of rain 50 percent. Heat index values up to 110 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 50 percent. .MONDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the upper 60s. Chance of rain 20 percent. .TUESDAY...Mostly sunny. Highs in the upper 80s. .TUESDAY NIGHT...Mostly clear. A slight chance of showers 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 100 in the afternoon. $$ MOZ049-050-131400- Osage MO-Callaway MO- Including the city of Fulton 127 AM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Partly cloudy. Near steady temperature in the mid 70s. Southeast winds around 5 mph. .THURSDAY...Mostly sunny. Hot with highs in the upper 90s. South winds 5 to 10 mph. Heat index values up to 110 in the afternoon. .THURSDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 109 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the upper 90s. South winds 5 to 10 mph. Heat index values up to 110 in the afternoon. .FRIDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 109 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 50 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Not as warm with highs in the mid 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 20 percent. .TUESDAY...Mostly sunny. Highs in the upper 80s. .TUESDAY NIGHT...Partly cloudy in the evening, then mostly clear with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. $$ MOZ042-131400- Audrain MO- Including the city of Mexico 127 AM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Near steady temperature in the mid 70s. Southeast winds around 5 mph. Chance of rain 20 percent. .THURSDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. 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. .THURSDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. A slight chance of showers and thunderstorms. Humid with lows in the mid 70s. Southeast winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 106 early in the evening. .FRIDAY...Mostly sunny. Humid with highs in the mid 90s. South winds 5 to 10 mph. Heat index values up to 106 in the afternoon. .FRIDAY NIGHT...Mostly clear. A slight chance of showers after midnight. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 106 early in the evening. .SATURDAY...Mostly sunny. 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. 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 100. .SUNDAY NIGHT...Mostly cloudy with a chance of showers and thunderstorms. Lows in the upper 60s. Chance of rain 50 percent. Heat index values up to 100 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs in the lower 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the mid 60s. Chance of rain 20 percent. .TUESDAY...Mostly sunny. Highs in the mid 80s. .TUESDAY NIGHT...Partly cloudy in the evening, then mostly clear with a slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs in the upper 80s. $$ MOZ041-047-048-131400- Boone MO-Moniteau MO-Cole MO- Including the cities of Columbia and Jefferson City 127 AM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Partly cloudy. Near steady temperature in the upper 70s. Southeast winds around 5 mph. .THURSDAY...Mostly sunny. Hot with highs in the upper 90s. South winds 5 to 10 mph. Heat index values up to 111 in the afternoon. .THURSDAY NIGHT...Mostly clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 110 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the upper 90s. South winds around 5 mph. Heat index values up to 110 in the afternoon. .FRIDAY NIGHT...Mostly clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 109 early in the evening. .SATURDAY AND SATURDAY NIGHT...Mostly clear. Hot. Highs in the upper 90s. Lows in the upper 70s. Heat index values up to 110. .SUNDAY...Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 105 in the afternoon. .SUNDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 50 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 20 percent. .TUESDAY...Mostly sunny. Highs in the upper 80s. .TUESDAY NIGHT...Partly cloudy in the evening, then mostly clear with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100 in the afternoon. $$ ILZ095>097-MOZ018-019-026-027-131400- Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Including the cities of Quincy, Mount Sterling, Pittsfield, and Hannibal 127 AM CDT Thu Aug 13 2026 .REST OF TONIGHT...Mostly cloudy with a chance of showers and thunderstorms. Near steady temperature in the lower 70s. East winds around 5 mph. Chance of rain 30 percent. .THURSDAY...Mostly cloudy with a chance of showers and thunderstorms in the morning, then mostly sunny with a slight chance of showers and thunderstorms in the afternoon. Humid with highs in the lower 90s. Southeast winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 109 in the afternoon. .THURSDAY NIGHT...Mostly clear with a slight chance of showers and thunderstorms in the evening, then partly cloudy with 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 109 early in the evening. .FRIDAY...Mostly sunny. A chance of showers with a slight chance of thunderstorms in the morning. Humid with highs in the lower 90s. Southeast winds around 5 mph. Chance of rain 40 percent. Heat index values up to 109 in the afternoon. .FRIDAY NIGHT...Partly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Humid with lows in the mid 70s. Southeast winds around 5 mph. Chance of rain 50 percent. Heat index values up to 109 early in the evening. .SATURDAY THROUGH SUNDAY...Partly cloudy with a slight chance of showers and thunderstorms. Highs in the lower 90s. Lows in the mid 70s. 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 50 percent. Heat index values up to 100 early in the evening. .MONDAY THROUGH TUESDAY...Partly cloudy. Highs in the mid 80s. Lows in the mid 60s. .TUESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs in the upper 80s. $$ MOZ034>036-131400- Monroe MO-Ralls MO-Pike MO- Including the city of Bowling Green 127 AM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Mostly cloudy with a chance of showers and thunderstorms. Near steady temperature in the lower 70s. East winds around 5 mph. Chance of rain 30 percent. .THURSDAY...Mostly sunny. A chance of showers and thunderstorms in the morning. Humid with highs in the lower 90s. South winds 5 to 10 mph. Chance of rain 30 percent. Heat index values up to 108 in the afternoon. .THURSDAY NIGHT...Mostly clear 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. Humid with lows in the mid 70s. Southeast winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 109 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 around 5 mph. Chance of rain 20 percent. Heat index values up to 109 in the afternoon. .FRIDAY NIGHT...Mostly clear in the evening, then partly cloudy with 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 40 percent. Heat index values up to 109 early in the evening. .SATURDAY...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 105 in the afternoon. .SATURDAY NIGHT AND SUNDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the mid 70s. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105. .SUNDAY NIGHT...Mostly cloudy with a chance of showers and thunderstorms. Lows around 70. 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 AND TUESDAY...Partly cloudy. Lows in the upper 60s. Highs in the mid 80s. .TUESDAY NIGHT...Partly cloudy in the evening, then mostly clear with a slight chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs in the upper 80s. $$ ILZ069-074-131400- Clinton IL-Washington IL- 127 AM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Near steady temperature in the mid 70s. Southeast winds around 5 mph. Chance of rain 30 percent. .THURSDAY...Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Humid with highs in the mid 90s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 116 in the afternoon. .THURSDAY 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. Southeast winds around 5 mph. Chance of rain 20 percent. Heat index values up to 114 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the upper 90s. South winds around 5 mph. Heat index values up to 116 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 115 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the upper 70s. Heat index values up to 110. .SUNDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. A chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 40 percent. Heat index values up to 110 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 40 percent. .MONDAY NIGHT AND TUESDAY...Partly cloudy. Lows in the upper 60s. Highs in the upper 80s. .TUESDAY NIGHT...Mostly clear. Lows around 70. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100. $$ ILZ070-131400- Marion IL- Including the cities of Centralia and Salem 127 AM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Near steady temperature in the mid 70s. Light and variable winds. Chance of rain 30 percent. .THURSDAY...Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Humid with highs in the lower 90s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 110 in the afternoon. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Humid with lows in the mid 70s. Southeast winds around 5 mph. Chance of rain 20 percent. Heat index values up to 108 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the mid 90s. South winds around 5 mph. Heat index values up to 111 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. Southeast winds around 5 mph. Heat index values up to 108 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the mid 90s. Lows in the upper 70s. Heat index values up to 110. .SUNDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. A chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 40 percent. .MONDAY NIGHT...Partly cloudy. Lows in the upper 60s. .TUESDAY AND TUESDAY NIGHT...Mostly clear. Highs in the mid 80s. Lows in the upper 60s. .WEDNESDAY...Mostly sunny. Highs around 90. $$ MOZ074-084-085-099-131400- Saint Francois MO-Iron MO-Madison MO-Reynolds MO- Including the city of Farmington 127 AM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Mostly cloudy. Near steady temperature in the upper 70s. South winds around 5 mph. .THURSDAY...Mostly sunny. Hot with highs in the mid 90s. Southwest winds around 5 mph. Heat index values up to 108. .THURSDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 105 early in the evening. .FRIDAY...Sunny, hot with highs in the upper 90s. Southwest 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 106 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...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. .MONDAY AND MONDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms. Highs around 90. Lows in the upper 60s. Chance of rain 50 percent. Heat index values up to 105. .TUESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 20 percent. .TUESDAY NIGHT...Mostly clear. Lows around 70. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100 in the afternoon. $$ MOZ051-060-131400- Montgomery MO-Warren MO- 127 AM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Near steady temperature in the mid 70s. Southeast winds around 5 mph. Chance of rain 20 percent. .THURSDAY...Mostly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Hot with highs in the mid 90s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 112 in the afternoon. .THURSDAY NIGHT...Mostly clear with a slight chance of showers and thunderstorms in the evening, then partly cloudy after midnight. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 111 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the upper 90s. South winds around 5 mph. Heat index values up to 112 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 112 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 110. .SUNDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows around 70. Chance of rain 50 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Not as warm with highs in the mid 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the mid 60s. Chance of rain 20 percent. .TUESDAY...Mostly sunny. Highs in the mid 80s. .TUESDAY NIGHT...Partly cloudy in the evening, then mostly clear with a slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs around 90. Heat index values up to 100 in the afternoon. $$ MOZ052-131400- Lincoln MO- 127 AM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Near steady temperature in the mid 70s. Light and variable winds. Chance of rain 30 percent. .THURSDAY...Mostly sunny. A chance of showers and thunderstorms, mainly in the morning. Humid with highs in the mid 90s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 112 in the afternoon. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Humid with lows in the mid 70s. Southeast winds around 5 mph. Chance of rain 20 percent. Heat index values up to 111 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the mid 90s. Southeast winds around 5 mph, becoming southwest around 5 mph in the afternoon. Heat index values up to 112 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 112 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...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. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs in the mid 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the upper 60s. Chance of rain 20 percent. .TUESDAY...Mostly sunny. Highs in the mid 80s. .TUESDAY NIGHT...Mostly clear. A slight chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs around 90. $$ ILZ058-059-098-099-131400- Greene IL-Macoupin IL-Calhoun IL-Jersey IL- 127 AM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Near steady temperature in the lower 70s. Southeast winds around 5 mph. Chance of rain 30 percent. .THURSDAY...Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Humid with highs in the lower 90s. Southeast winds around 5 mph. Chance of rain 30 percent. Heat index values up to 109 in the afternoon. .THURSDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Humid with lows in the lower 70s. Southeast winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 108 early in the evening. .FRIDAY...Mostly sunny. Humid with highs in the mid 90s. Southeast winds around 5 mph, becoming south in the afternoon. Heat index values up to 111 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. Southeast winds around 5 mph. Heat index values up to 110 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 110. .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. .SUNDAY 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 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs in the mid 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the mid 60s. Chance of rain 20 percent. .TUESDAY...Sunny. Highs in the mid 80s. .TUESDAY NIGHT...Partly cloudy in the evening, then mostly clear with a slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs in the upper 80s. $$ ILZ060-064-065-131400- Montgomery IL-Bond IL-Fayette IL- Including the cities of Litchfield and Vandalia 127 AM CDT Thu Aug 13 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Near steady temperature in the lower 70s. Southeast winds around 5 mph. Chance of rain 30 percent. .THURSDAY...Partly sunny. A chance of showers and thunderstorms, mainly in the morning. Humid with highs in the lower 90s. Southeast winds around 5 mph. Chance of rain 30 percent. Heat index values up to 109 in the afternoon. .THURSDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Humid with lows in the lower 70s. East winds around 5 mph. Chance of rain 20 percent. Heat index values up to 107 early in the evening. .FRIDAY...Mostly sunny. Humid with highs in the lower 90s. Southeast winds around 5 mph, becoming south in the afternoon. Heat index values up to 111 in the afternoon. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. Southeast winds around 5 mph. Heat index values up to 110 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 110. .SUNDAY NIGHT...Mostly clear in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly 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 mid 60s. .TUESDAY AND TUESDAY NIGHT...Mostly clear. Highs in the mid 80s. Lows in the upper 60s. .WEDNESDAY...Mostly sunny. Highs in the upper 80s. $$ ILZ079-MOZ075-131400- Randolph IL-Sainte Genevieve MO- Including the cities of Chester and Sparta 127 AM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Mostly cloudy with a 20 percent chance of showers. Near steady temperature in the mid 70s. South winds around 5 mph. .THURSDAY...Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the mid 90s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 114 in the afternoon. .THURSDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 112 early in the evening. .FRIDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 114. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 113 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 110. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Lows in the lower 70s. Chance of rain 30 percent. Heat index values up to 110 early in the evening. .MONDAY...Partly sunny. A chance of showers and thunderstorms in the afternoon. Not as warm with highs in the upper 80s. Chance of rain 40 percent. Heat index values up to 100. .MONDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the upper 60s. Chance of rain 20 percent. .TUESDAY...Mostly sunny. Highs in the upper 80s. .TUESDAY NIGHT...Mostly clear. Lows around 70. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100. $$ MOZ059-062-072-073-131400- Gasconade MO-Franklin MO-Crawford MO-Washington MO- Including the cities of Washington, Union, and Sullivan 127 AM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Partly cloudy. Near steady temperature in the upper 70s. South winds around 5 mph. .THURSDAY...Mostly 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 110. .THURSDAY NIGHT...Mostly clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 109 early in the evening. .FRIDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 111. .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 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 with a chance of showers and thunderstorms. 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 50 percent. .MONDAY NIGHT AND TUESDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the upper 60s. Highs in the upper 80s. Chance of rain 20 percent. .TUESDAY NIGHT...Mostly clear. Lows around 70. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100 in the afternoon. $$ ILZ102-MOZ065-131400- Monroe IL-Jefferson MO- 127 AM CDT Thu Aug 13 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .REST OF TONIGHT...Mostly cloudy with a 20 percent chance of showers. Near steady temperature in the upper 70s. Southeast winds around 5 mph. .THURSDAY...Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the upper 90s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 115. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 112 early in the evening. .FRIDAY...Sunny, hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 115. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 113 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs around 100. Lows in the mid 70s. Heat index values up to 110. .SUNDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 40 percent. Heat index values up to 110 early in the evening. .MONDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Not as warm with highs in the upper 80s. Chance of rain 40 percent. Heat index values up to 100. .MONDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the upper 60s. Chance of rain 20 percent. .TUESDAY...Mostly sunny. Highs in the upper 80s. .TUESDAY NIGHT...Mostly clear. Lows around 70. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 105 in the afternoon. $$