Zone Forecast Product
Issued by NWS St. Louis, MO
Issued by NWS St. Louis, MO
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714 FPUS53 KLSX 122319 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 618 PM CDT Wed Aug 12 2026 ILZ100-101-MOZ061-063-064-130700- 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 618 PM CDT Wed Aug 12 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Mostly cloudy this evening, then becoming partly cloudy. Scattered showers and thunderstorms. Lows in the upper 70s. South winds around 5 mph. Chance of rain 50 percent. Heat index values up to 102 early this evening. .THURSDAY...Mostly sunny. Scattered showers and thunderstorms, 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 111 in the afternoon. .THURSDAY NIGHT...Partly cloudy. Isolated showers and thunderstorms in the evening. Humid with lows in the upper 70s. South winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 110 early in the evening. .FRIDAY...Mostly 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 upper 70s. South winds around 5 mph. Heat index values up to 111 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...Mostly clear in the evening, then partly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the lower 70s. Chance of rain 30 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly 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 upper 80s. Chance of rain 30 percent. .MONDAY NIGHT THROUGH TUESDAY NIGHT...Partly cloudy with a 20 percent chance of showers. Lows around 70. Highs in the upper 80s. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100. $$ MOZ049-050-130700- Osage MO-Callaway MO- Including the city of Fulton 618 PM CDT Wed Aug 12 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Partly cloudy with isolated showers and thunderstorms this evening, then mostly clear after midnight. Lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 103 early this evening. .THURSDAY...Mostly sunny. Hot with highs in the mid 90s. South winds 5 to 10 mph. Heat index values up to 108 in the afternoon. .THURSDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 106 early in the evening. .FRIDAY...Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 108 in the afternoon. .FRIDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 107 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy with a 20 percent chance of showers. Lows in the upper 60s. .TUESDAY...Mostly sunny. Highs in the upper 80s. .TUESDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the lower 70s. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. $$ MOZ042-130700- Audrain MO- Including the city of Mexico 618 PM CDT Wed Aug 12 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Partly cloudy. Isolated showers and thunderstorms after midnight. Lows in the mid 70s. Southeast winds 5 to 10 mph. Chance of rain 20 percent. .THURSDAY...Mostly sunny. Isolated 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 105 in the afternoon. .THURSDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Isolated showers and thunderstorms. Lows in the mid 70s. South winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 104 early in the evening. .FRIDAY...Mostly sunny. Highs in the lower 90s. Southwest winds 5 to 10 mph. Heat index values up to 104. .FRIDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. South winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 104 early in the evening. .SATURDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the mid 70s. Highs in the lower 90s. Heat index values up to 100. .SUNDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 40 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 mid 80s. Chance of rain 20 percent. .MONDAY NIGHT THROUGH TUESDAY NIGHT...Partly cloudy with a 20 percent chance of showers. Lows in the upper 60s. Highs in the mid 80s. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20 percent. $$ MOZ041-047-048-130700- Boone MO-Moniteau MO-Cole MO- Including the cities of Columbia and Jefferson City 618 PM CDT Wed Aug 12 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Partly cloudy this evening, then becoming mostly clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 104 early this evening. .THURSDAY...Mostly sunny. Hot with highs in the upper 90s. South winds 5 to 10 mph. Heat index values up to 108 in the afternoon. .THURSDAY NIGHT...Mostly clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 108 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 109 in the afternoon. .FRIDAY NIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the upper 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 108 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the upper 70s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent. .MONDAY NIGHT...Partly cloudy with a 20 percent chance of showers. Lows around 70. .TUESDAY...Mostly sunny. Highs around 90. .TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the lower 70s. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 100. $$ ILZ095>097-MOZ018-019-026-027-130700- Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Including the cities of Quincy, Mount Sterling, Pittsfield, and Hannibal 618 PM CDT Wed Aug 12 2026 .TONIGHT...Partly cloudy. Scattered showers and thunderstorms after midnight. Lows in the lower 70s. East winds around 5 mph. Chance of rain 40 percent. .THURSDAY...Partly sunny. Scattered showers and thunderstorms, mainly in the morning. Humid with highs in the lower 90s. East winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 105 in the afternoon. .THURSDAY NIGHT...Partly cloudy with isolated showers and thunderstorms in the evening, then mostly cloudy with scattered showers and thunderstorms after midnight. Humid with lows in the lower 70s. East winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .FRIDAY...Partly sunny. Isolated showers and thunderstorms in the morning. Humid with highs in the lower 90s. East winds around 5 mph, becoming south in the afternoon. Chance of rain 20 percent. Heat index values up to 106 in the afternoon. .FRIDAY NIGHT...Partly cloudy. A chance of showers and 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 105 early in the evening. .SATURDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105 in the afternoon. .SATURDAY NIGHT...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. 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 in the upper 60s. 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. .MONDAY NIGHT AND TUESDAY...Partly cloudy. A 20 percent chance of showers. Lows in the upper 60s. Highs in the mid 80s. .TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the upper 60s. Highs in the upper 80s. Chance of rain 20 percent. $$ MOZ034>036-130700- Monroe MO-Ralls MO-Pike MO- Including the city of Bowling Green 618 PM CDT Wed Aug 12 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Partly cloudy. Scattered showers and thunderstorms after midnight. Lows in the mid 70s. East winds around 5 mph. Chance of rain 30 percent. .THURSDAY...Mostly sunny. Scattered showers and thunderstorms in the morning. Humid with highs in the lower 90s. Southeast winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 107 in the afternoon. .THURSDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Isolated showers and thunderstorms. Humid with lows in the mid 70s. Southeast winds around 5 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...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 107 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. Highs in the lower 90s. Heat index values up to 105. .SUNDAY 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 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 AND TUESDAY...Partly cloudy. A 20 percent chance of showers. Lows in the upper 60s. Highs in the mid 80s. .TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the upper 60s. Highs in the upper 80s. Chance of rain 20 percent. $$ ILZ069-074-130700- Clinton IL-Washington IL- 618 PM CDT Wed Aug 12 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Mostly cloudy this evening, then becoming partly cloudy. Scattered showers and thunderstorms. Lows in the mid 70s. South winds around 5 mph. Chance of rain 40 percent. Heat index values up to 102 early this evening. .THURSDAY...Mostly sunny. Scattered 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 111 in the afternoon. .THURSDAY NIGHT...Partly cloudy. Isolated showers and thunderstorms in the evening. Humid with lows in the upper 70s. South winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 110 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the mid 90s. Southwest 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 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...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .MONDAY...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 upper 80s. Chance of rain 30 percent. .MONDAY NIGHT THROUGH TUESDAY NIGHT...Partly cloudy with a 20 percent chance of showers. Lows around 70. Highs in the upper 80s. .WEDNESDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100. $$ ILZ070-130700- Marion IL- Including the cities of Centralia and Salem 618 PM CDT Wed Aug 12 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Mostly cloudy with scattered showers and thunderstorms. Lows in the mid 70s. South winds around 5 mph. Chance of rain 40 percent. .THURSDAY...Partly sunny. Scattered showers and thunderstorms, mainly in the morning. Humid with highs in the lower 90s. Southeast winds around 5 mph, becoming southwest around 5 mph in the afternoon. Chance of rain 30 percent. Heat index values up to 106 in the afternoon. .THURSDAY NIGHT...Partly cloudy. Isolated showers and thunderstorms in the evening. Humid with lows in the mid 70s. Southeast winds around 5 mph. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the mid 90s. South winds around 5 mph. Heat index values up to 108. .FRIDAY NIGHT...Mostly clear. Humid with lows in the mid 70s. South winds around 5 mph. Heat index values up to 105 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105. .SUNDAY NIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny with a slight chance of thunderstorms. A slight chance of showers in the morning, then a chance of showers in the afternoon. Highs in the upper 80s. Chance of rain 30 percent. .MONDAY NIGHT THROUGH TUESDAY NIGHT...Partly cloudy with a 20 percent chance of showers. Lows in the upper 60s. Highs in the upper 80s. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs around 90. Chance of rain 20 percent. $$ MOZ074-084-085-099-130700- Saint Francois MO-Iron MO-Madison MO-Reynolds MO- Including the city of Farmington 618 PM CDT Wed Aug 12 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Partly cloudy. Scattered showers and thunderstorms this evening. Lows in the mid 70s. South winds around 5 mph. Chance of rain 50 percent. Heat index values up to 104 early this evening. .THURSDAY...Mostly sunny. Hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 107. .THURSDAY NIGHT...Partly cloudy in the evening, then becoming 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. Southwest 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 106 early in the evening. .SATURDAY THROUGH SUNDAY NIGHT...Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 105. .MONDAY...Mostly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 30 percent. .MONDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Lows around 70. Chance of rain 20 percent. .TUESDAY...Mostly sunny. A slight chance of showers in the afternoon. Highs around 90. Chance of rain 20 percent. .TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows in the lower 70s. Highs in the lower 90s. $$ MOZ051-060-130700- Montgomery MO-Warren MO- 618 PM CDT Wed Aug 12 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Partly cloudy with isolated showers and thunderstorms. Lows in the mid 70s. Southeast winds around 5 mph. Chance of rain 20 percent. Heat index values up to 103 early this evening. .THURSDAY...Mostly sunny. Isolated showers and thunderstorms in the morning. Hot with highs in the mid 90s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 109 in the afternoon. .THURSDAY NIGHT...Mostly clear with isolated showers and thunderstorms in the evening, then partly cloudy after midnight. Lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 108 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the mid 90s. Southwest winds around 5 mph. Heat index values up to 109 in the afternoon. .FRIDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 109 early in the evening. .SATURDAY...Mostly sunny. Hot with highs in the mid 90s. Heat index values up to 105 in the afternoon. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Hot. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 110. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 30 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Chance of rain 20 percent. .MONDAY NIGHT THROUGH TUESDAY NIGHT...Partly cloudy with a 20 percent chance of showers. Lows in the upper 60s. Highs in the upper 80s. .WEDNESDAY...Mostly sunny. Highs around 90. $$ MOZ052-130700- Lincoln MO- 618 PM CDT Wed Aug 12 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Partly cloudy. Isolated showers and thunderstorms this evening, then scattered showers and thunderstorms after midnight. Lows in the mid 70s. Southeast winds around 5 mph. Chance of rain 30 percent. Heat index values up to 100 early this evening. .THURSDAY...Mostly sunny. Scattered showers and thunderstorms, 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 109 in the afternoon. .THURSDAY NIGHT...Partly cloudy with isolated showers and thunderstorms. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 108 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the mid 90s. Southwest 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. Heat index values up to 110 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 after midnight. Lows in the lower 70s. Chance of rain 30 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 AND TUESDAY...Partly cloudy. A 20 percent chance of showers. Lows in the upper 60s. Highs in the upper 80s. .TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows around 70. Highs around 90. $$ ILZ058-059-098-099-130700- Greene IL-Macoupin IL-Calhoun IL-Jersey IL- 618 PM CDT Wed Aug 12 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Mostly cloudy with isolated showers and thunderstorms this evening, then partly cloudy with scattered showers and thunderstorms after midnight. Lows in the lower 70s. Southeast winds around 5 mph. Chance of rain 40 percent. .THURSDAY...Partly sunny. Scattered showers and thunderstorms, mainly in the morning. Humid with highs in the lower 90s. Southeast winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 107 in the afternoon. .THURSDAY NIGHT...Partly cloudy with isolated showers and thunderstorms. Humid with lows in the lower 70s. Southeast winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 106 early in the evening. .FRIDAY...Mostly sunny. Humid with highs in the mid 90s. South winds around 5 mph. Heat index values up to 107 in the afternoon. .FRIDAY NIGHT...Partly cloudy. Humid with lows in the mid 70s. Southeast winds around 5 mph. Heat index values up to 107 early in the evening. .SATURDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 105 in the afternoon. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the mid 70s. Highs in the mid 90s. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 30 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs in the mid 80s. Chance of rain 20 percent. .MONDAY NIGHT THROUGH TUESDAY NIGHT...Partly cloudy with a 20 percent chance of showers. Lows in the upper 60s. Highs in the mid 80s. .WEDNESDAY...Mostly sunny. Highs in the upper 80s. $$ ILZ060-064-065-130700- Montgomery IL-Bond IL-Fayette IL- Including the cities of Litchfield and Vandalia 618 PM CDT Wed Aug 12 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Mostly cloudy this evening, then becoming partly cloudy. Scattered showers and thunderstorms. Lows in the lower 70s. Southeast winds around 5 mph. Chance of rain 40 percent. .THURSDAY...Partly sunny. Scattered showers and thunderstorms, mainly 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 107 in the afternoon. .THURSDAY NIGHT...Partly cloudy with isolated 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 105 early in the evening. .FRIDAY...Mostly sunny. Humid with highs in the lower 90s. South winds around 5 mph. Heat index values up to 107. .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. A slight chance of showers and thunderstorms 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...Mostly clear. Lows in the mid 70s. Highs in the mid 90s. Heat index values up to 105. .SUNDAY NIGHT...Mostly clear in the evening, then partly cloudy with 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 thunderstorms. A slight chance of showers in the morning, then a chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 30 percent. .MONDAY NIGHT THROUGH TUESDAY NIGHT...Partly cloudy with a 20 percent chance of showers. Lows in the upper 60s. Highs in the mid 80s. .WEDNESDAY...Mostly sunny. Highs in the upper 80s. $$ ILZ079-MOZ075-130700- Randolph IL-Sainte Genevieve MO- Including the cities of Chester and Sparta 618 PM CDT Wed Aug 12 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Mostly cloudy with scattered showers and thunderstorms this evening, then partly cloudy with isolated showers and thunderstorms after midnight. Lows in the mid 70s. South winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 106 early this evening. .THURSDAY...Mostly sunny with isolated showers and thunderstorms. Hot with highs in the mid 90s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 110. .THURSDAY NIGHT...Partly cloudy in the evening, then clearing. Humid with lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 109 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 111. .FRIDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 110 early in the evening. .SATURDAY THROUGH SUNDAY NIGHT...Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 110. .MONDAY...Mostly sunny. A chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 30 percent. Heat index values up to 100. .MONDAY NIGHT AND TUESDAY...Partly cloudy. A 20 percent chance of showers. Lows in the upper 60s. Highs in the upper 80s. .TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows around 70. Highs in the lower 90s. Heat index values up to 100. $$ MOZ059-062-072-073-130700- Gasconade MO-Franklin MO-Crawford MO-Washington MO- Including the cities of Washington, Union, and Sullivan 618 PM CDT Wed Aug 12 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Partly cloudy. Scattered showers and thunderstorms this evening. Lows in the mid 70s. South winds around 5 mph. Chance of rain 50 percent. Heat index values up to 104 early this evening. .THURSDAY...Mostly sunny. Hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 108. .THURSDAY NIGHT...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. Southwest winds around 5 mph. Heat index values up to 108. .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 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. A slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening. .MONDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs around 90. Chance of rain 20 percent. .MONDAY NIGHT...A slight chance of thunderstorms in the evening. Partly cloudy with a slight chance of showers. Lows in the upper 60s. Chance of rain 20 percent. .TUESDAY THROUGH WEDNESDAY...Partly cloudy. Highs in the lower 90s. Lows in the lower 70s. $$ ILZ102-MOZ065-130700- Monroe IL-Jefferson MO- 618 PM CDT Wed Aug 12 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SATURDAY... .TONIGHT...Partly cloudy with scattered showers and thunderstorms. Lows in the upper 70s. South winds around 5 mph. Chance of rain 50 percent. Heat index values up to 106 early this evening. .THURSDAY...Mostly sunny with isolated showers and thunderstorms. Hot with highs in the upper 90s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 112 in the afternoon. .THURSDAY NIGHT...Partly cloudy with isolated showers and thunderstorms in the evening, then mostly clear after midnight. Lows in the upper 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 109 early in the evening. .FRIDAY...Mostly sunny. Hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 112. .FRIDAY NIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 111 early in the evening. .SATURDAY THROUGH SUNDAY...Mostly clear. Hot. Highs in the upper 90s. Lows in the mid 70s. Heat index values up to 110. .SUNDAY NIGHT...Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 20 percent. Heat index values up to 110 early in the evening. .MONDAY...Partly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs around 90. Chance of rain 20 percent. Heat index values up to 100. .MONDAY NIGHT AND TUESDAY...Partly cloudy. A 20 percent chance of showers. Lows in the upper 60s. Highs in the upper 80s. .TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. Lows around 70. Highs in the lower 90s. Heat index values up to 100. $$