Zone Forecast Product
Issued by NWS St. Louis, MO
Issued by NWS St. Louis, MO
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170 FPUS53 KLSX 151902 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 202 PM CDT Sat Aug 15 2026 ILZ100-101-MOZ061-063-064-160300- 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 202 PM CDT Sat Aug 15 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Mostly sunny. Near steady temperature in the lower 90s. Southwest winds around 5 mph. Heat index values up to 109. .TONIGHT...Mostly clear in the evening, then becoming partly cloudy. Humid with lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 109 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Humid with highs in the mid 90s. Southwest winds around 5 mph, becoming northwest in the afternoon. Chance of rain 20 percent. Heat index values up to 109. .SUNDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers, mainly in the evening. Humid with lows in the lower 70s. North winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 107 early in the evening. .MONDAY...Mostly sunny. Highs in the mid 80s. North winds 5 to 10 mph. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the mid 60s. 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. A chance of showers in the morning, then a slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Chance of rain 30 percent. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers after midnight. Lows in the upper 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. $$ MOZ049-050-160300- Osage MO-Callaway MO- Including the city of Fulton 202 PM CDT Sat Aug 15 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Mostly sunny. Near steady temperature in the lower 90s. Southwest winds 5 to 10 mph. Heat index values up to 104. .TONIGHT...Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 105 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Humid with highs in the lower 90s. West winds 5 to 10 mph, becoming northwest in the afternoon. Chance of rain 20 percent. Heat index values up to 105. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Humid with lows in the upper 60s. North winds 5 to 10 mph. Chance of rain 30 percent. Heat index values up to 101 early in the evening. .MONDAY...Mostly sunny. Highs in the mid 80s. North winds around 5 mph. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the mid 60s. Highs around 90. .TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the lower 70s. Highs in the upper 80s. Chance of rain 40 percent. .WEDNESDAY NIGHT...Partly cloudy in the evening, then mostly cloudy with a chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 60s. Chance of rain 30 percent. .THURSDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 80s. Chance of rain 20 percent. .THURSDAY NIGHT AND FRIDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the mid 60s. Highs in the mid 80s. Chance of rain 20 percent. $$ MOZ042-160300- Audrain MO- Including the city of Mexico 202 PM CDT Sat Aug 15 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Partly sunny. Near steady temperature in the upper 80s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 101. .TONIGHT...Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 102 early in the evening. .SUNDAY...Partly 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 upper 80s. West winds 5 to 10 mph, becoming northwest in the afternoon. Chance of rain 30 percent. .SUNDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the mid 60s. North winds 5 to 10 mph. Chance of rain 20 percent. .MONDAY...Sunny. Highs in the lower 80s. North winds around 5 mph. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the lower 60s. Highs in the mid 80s. .TUESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 50 percent. .WEDNESDAY...Partly sunny. A chance of showers with a slight chance of thunderstorms in the morning. Highs in the lower 80s. Chance of rain 50 percent. .WEDNESDAY NIGHT...Partly cloudy. A chance of showers after midnight. Lows in the lower 60s. Chance of rain 30 percent. .THURSDAY...Partly sunny. A slight chance of showers in the morning. Highs in the upper 70s. Chance of rain 20 percent. .THURSDAY NIGHT AND FRIDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the lower 60s. Highs in the lower 80s. Chance of rain 20 percent. $$ MOZ041-047-048-160300- Boone MO-Moniteau MO-Cole MO- Including the cities of Columbia and Jefferson City 202 PM CDT Sat Aug 15 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Mostly sunny. Hot. Near steady temperature in the lower 90s. Southwest winds 5 to 10 mph. Heat index values up to 106. .TONIGHT...Partly cloudy in the evening, then mostly 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 106 early in the evening. .SUNDAY...Mostly sunny. A chance of showers and thunderstorms in the afternoon. Humid with highs in the lower 90s. Northwest winds 5 to 10 mph. Chance of rain 30 percent. Heat index values up to 106 in the afternoon. .SUNDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Humid with lows in the upper 60s. North winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 101 early in the evening. .MONDAY...Sunny. Highs in the mid 80s. North winds around 5 mph. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the mid 60s. Highs in the lower 90s. .TUESDAY 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 lower 70s. Chance of rain 50 percent. .WEDNESDAY...Mostly sunny. A chance of showers with a slight chance of thunderstorms in the morning. Highs in the upper 80s. Chance of rain 50 percent. .WEDNESDAY 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 upper 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the mid 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. Highs in the upper 80s. $$ ILZ095>097-MOZ018-019-026-027-160300- Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Including the cities of Quincy, Mount Sterling, Pittsfield, and Hannibal 202 PM CDT Sat Aug 15 2026 .THIS AFTERNOON...Partly sunny. Near steady temperature in the mid 80s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 101. .TONIGHT...Mostly cloudy with a chance of showers and thunderstorms. Humid with lows in the mid 70s. Southwest winds around 5 mph, becoming west after midnight. Chance of rain 50 percent. Heat index values up to 102 early in the evening. .SUNDAY...Partly sunny with a chance of showers and thunderstorms. Humid with highs in the mid 80s. Northwest winds 5 to 10 mph. Chance of rain 40 percent. .SUNDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly clear after midnight. Lows in the mid 60s. North winds 5 to 10 mph. Chance of rain 20 percent. .MONDAY...Sunny. Highs in the lower 80s. North winds around 5 mph. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. .TUESDAY...Mostly sunny. Highs in the mid 80s. .TUESDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the upper 60s. Chance of rain 70 percent. .WEDNESDAY...Partly sunny. A chance of showers with a slight chance of thunderstorms in the morning. Highs in the lower 80s. Chance of rain 50 percent. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20 percent. .THURSDAY...Mostly sunny. Highs in the upper 70s. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. $$ MOZ034-160300- Monroe MO- 202 PM CDT Sat Aug 15 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT THIS EVENING... .THIS AFTERNOON...Mostly cloudy. Near steady temperature in the upper 80s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 100. .TONIGHT...Mostly 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 lower 70s. South winds around 5 mph, becoming west after midnight. Chance of rain 40 percent. Heat index values up to 102 early in the evening. .SUNDAY...Partly 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 mid 80s. Northwest winds 5 to 10 mph. Chance of rain 40 percent. .SUNDAY NIGHT...Mostly cloudy with a chance of showers and thunderstorms in the evening, then mostly clear after midnight. Lows in the mid 60s. North winds 5 to 10 mph. Chance of rain 30 percent. .MONDAY...Sunny. Highs in the lower 80s. North winds around 5 mph. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. .TUESDAY...Mostly sunny. Highs in the mid 80s. .TUESDAY 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 50 percent. .WEDNESDAY...Partly sunny. A chance of showers with a slight chance of thunderstorms in the morning. Highs in the lower 80s. Chance of rain 50 percent. .WEDNESDAY NIGHT...Partly cloudy in the evening, then mostly cloudy with a slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20 percent. .THURSDAY...Mostly sunny. Highs in the upper 70s. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. A slight chance of showers in the afternoon. Highs in the lower 80s. Chance of rain 20 percent. $$ MOZ035-036-160300- Ralls MO-Pike MO- Including the city of Bowling Green 202 PM CDT Sat Aug 15 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Mostly cloudy. Near steady temperature in the upper 80s. Southwest winds 5 to 10 mph with gusts up to 20 mph. Heat index values up to 102. .TONIGHT...Mostly cloudy. 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 104 early in the evening. .SUNDAY...Partly 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 upper 80s. Northwest winds 5 to 10 mph. Chance of rain 30 percent. Heat index values up to 102. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms in the evening. Lows in the upper 60s. North winds 5 to 10 mph. Chance of rain 30 percent. .MONDAY...Sunny. Highs in the lower 80s. North winds around 5 mph. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. .TUESDAY...Mostly sunny. Highs in the upper 80s. .TUESDAY NIGHT...Partly cloudy in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 50 percent. .WEDNESDAY...Partly sunny. A chance of showers with a slight chance of thunderstorms in the morning. Highs in the mid 80s. Chance of rain 50 percent. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the mid 60s. Chance of rain 20 percent. .THURSDAY...Partly sunny. A slight chance of showers in the morning. Highs around 80. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. $$ ILZ069-070-074-160300- Clinton IL-Marion IL-Washington IL- Including the cities of Centralia and Salem 202 PM CDT Sat Aug 15 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Mostly sunny. Near steady temperature in the lower 90s. Southwest winds around 5 mph. Heat index values up to 110. .TONIGHT...Mostly clear in the evening, then becoming partly cloudy. Humid with lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 109 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Humid with highs in the mid 90s. West winds around 5 mph. Chance of rain 20 percent. Heat index values up to 110. .SUNDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms. Humid with lows in the lower 70s. Northwest winds around 5 mph. Chance of rain 40 percent. Heat index values up to 107 early in the evening. .MONDAY...Mostly sunny. Highs in the mid 80s. North winds around 5 mph. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the mid 60s. Highs in the upper 80s. .TUESDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows around 70. .WEDNESDAY AND WEDNESDAY NIGHT...Partly cloudy. A chance of showers with a slight chance of thunderstorms. Highs in the upper 80s. Lows in the mid 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. $$ MOZ074-084-085-099-160300- Saint Francois MO-Iron MO-Madison MO-Reynolds MO- Including the city of Farmington 202 PM CDT Sat Aug 15 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Sunny, hot. Near steady temperature in the upper 90s. Southwest winds around 5 mph. Heat index values up to 106. .TONIGHT...Mostly clear. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 103 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. West winds around 5 mph. Chance of rain 20 percent. Heat index values up to 109. .SUNDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Humid with lows in the lower 70s. North winds around 5 mph. Chance of rain 40 percent. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny. A chance of showers and thunderstorms in the morning. Not as warm with highs in the upper 80s. North winds around 5 mph. Chance of rain 50 percent. .MONDAY NIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows in the mid 60s. .TUESDAY AND TUESDAY NIGHT...Mostly clear. Highs in the lower 90s. Lows around 70. .WEDNESDAY...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 105. .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. Lows in the upper 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the mid 80s. Chance of rain 40 percent. .THURSDAY NIGHT AND FRIDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows in the mid 60s. Highs in the mid 80s. Chance of rain 20 percent. $$ MOZ051-060-160300- Montgomery MO-Warren MO- 202 PM CDT Sat Aug 15 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Mostly sunny. Near steady temperature in the lower 90s. Southwest winds around 5 mph. Heat index values up to 105. .TONIGHT...Partly cloudy in the evening, then mostly cloudy with a slight chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. Light and variable winds, becoming southwest around 5 mph after midnight. Chance of rain 20 percent. Heat index values up to 106 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Humid with highs in the lower 90s. West winds around 5 mph, becoming northwest around 5 mph in the afternoon. Chance of rain 20 percent. Heat index values up to 107 in the afternoon. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms in the evening. Humid with lows in the upper 60s. North winds around 5 mph. Chance of rain 30 percent. Heat index values up to 102 early in the evening. .MONDAY...Mostly sunny. Highs in the mid 80s. North winds around 5 mph. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the lower 60s. Highs in the upper 80s. .TUESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 20 percent. .WEDNESDAY...Partly sunny. A chance of showers in the morning. Highs in the mid 80s. Chance of rain 30 percent. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the mid 60s. Chance of rain 20 percent. .THURSDAY...Partly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. Highs in the lower 80s. $$ MOZ052-160300- Lincoln MO- 202 PM CDT Sat Aug 15 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Partly sunny. Near steady temperature in the lower 90s. Southwest winds around 5 mph. Heat index values up to 106. .TONIGHT...Partly cloudy in the evening, then mostly cloudy with 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 105 early in the evening. .SUNDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the lower 90s. West winds around 5 mph, becoming northwest around 5 mph in the afternoon. Chance of rain 20 percent. Heat index values up to 107. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms in the evening. Humid with lows in the upper 60s. North winds around 5 mph. Chance of rain 30 percent. Heat index values up to 102 early in the evening. .MONDAY...Sunny. Highs in the mid 80s. North winds around 5 mph. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the mid 60s. Highs in the upper 80s. .TUESDAY NIGHT...Partly cloudy in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 30 percent. .WEDNESDAY...Partly sunny. A chance of showers in the morning. Highs in the mid 80s. Chance of rain 40 percent. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the mid 60s. Chance of rain 20 percent. .THURSDAY...Partly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. $$ ILZ058-059-098-099-160300- Greene IL-Macoupin IL-Calhoun IL-Jersey IL- 202 PM CDT Sat Aug 15 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Partly sunny. Near steady temperature in the upper 80s. Southwest winds around 5 mph. Heat index values up to 104. .TONIGHT...Partly cloudy in the evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. Southwest winds around 5 mph. Chance of rain 40 percent. Heat index values up to 104 early in the evening. .SUNDAY...Partly sunny with a slight chance of showers and thunderstorms. Humid with highs around 90. Southwest winds around 5 mph, becoming northwest in the afternoon. Chance of rain 20 percent. Heat index values up to 104. .SUNDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms in the evening. Humid with lows in the upper 60s. Northwest winds 5 to 10 mph. Chance of rain 30 percent. Heat index values up to 101 early in the evening. .MONDAY...Sunny. Highs in the lower 80s. North winds around 5 mph. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the lower 60s. Highs in the upper 80s. .TUESDAY NIGHT...Partly cloudy 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. .WEDNESDAY...Partly sunny. A chance of showers in the morning, then a slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers after midnight. Lows in the lower 60s. Chance of rain 30 percent. .THURSDAY...Partly sunny. A slight chance of showers in the morning. Highs around 80. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. $$ ILZ060-064-065-160300- Montgomery IL-Bond IL-Fayette IL- Including the cities of Litchfield and Vandalia 202 PM CDT Sat Aug 15 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Partly sunny. Near steady temperature around 90. Southwest winds around 5 mph. Heat index values up to 104. .TONIGHT...Partly cloudy. Humid with lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 104 early in the evening. .SUNDAY...Partly sunny with a slight chance of showers and thunderstorms. Humid with highs in the lower 90s. West winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 106. .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. Humid with lows in the upper 60s. Northwest winds around 5 mph. Chance of rain 40 percent. Heat index values up to 103 early in the evening. .MONDAY...Mostly sunny. Highs in the mid 80s. North winds around 5 mph. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the lower 60s. Highs in the mid 80s. .TUESDAY NIGHT...Mostly clear in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 40 percent. .WEDNESDAY...Partly sunny with a chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent. .WEDNESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers after midnight. Lows in the mid 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny. A slight chance of showers in the morning. Highs around 80. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy. Lows in the lower 60s. .FRIDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. $$ ILZ079-MOZ075-160300- Randolph IL-Sainte Genevieve MO- Including the cities of Chester and Sparta 202 PM CDT Sat Aug 15 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Sunny, hot. Near steady temperature in the mid 90s. Southwest winds around 5 mph. Heat index values up to 111. .TONIGHT...Clear in the evening, then becoming partly cloudy. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 109 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. West winds around 5 mph. Chance of rain 20 percent. Heat index values up to 111. .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. Humid with lows around 70. North winds around 5 mph. Chance of rain 40 percent. Heat index values up to 108 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Not as warm. Humid with highs in the mid 80s. North winds around 5 mph. Chance of rain 20 percent. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the mid 60s. Highs in the upper 80s. .TUESDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows around 70. .WEDNESDAY...Mostly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the lower 90s. Chance of rain 30 percent. Heat index values up to 105 in the afternoon. .WEDNESDAY NIGHT...Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the lower 80s. Chance of rain 40 percent. .THURSDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. $$ MOZ059-062-072-073-160300- Gasconade MO-Franklin MO-Crawford MO-Washington MO- Including the cities of Washington, Union, and Sullivan 202 PM CDT Sat Aug 15 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Sunny, hot. Near steady temperature in the mid 90s. Southwest winds around 5 mph. Heat index values up to 106. .TONIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 105 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Southwest winds around 5 mph, becoming northwest around 5 mph in the afternoon. Chance of rain 20 percent. Heat index values up to 108. .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. Humid with lows in the upper 60s. North winds around 5 mph. Chance of rain 40 percent. Heat index values up to 104 early in the evening. .MONDAY...Mostly sunny. Not as warm with highs in the mid 80s. North winds around 5 mph. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the mid 60s. Highs in the lower 90s. .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. .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. Lows in the mid 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the lower 80s. Chance of rain 40 percent. .THURSDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the mid 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the mid 80s. Chance of rain 20 percent. $$ ILZ102-MOZ065-160300- Monroe IL-Jefferson MO- 202 PM CDT Sat Aug 15 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT SUNDAY... .THIS AFTERNOON...Sunny, hot. Near steady temperature in the mid 90s. Southwest winds around 5 mph. Heat index values up to 111. .TONIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 70s. Southwest winds around 5 mph. Heat index values up to 109 early in the evening. .SUNDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the upper 90s. West winds around 5 mph. Chance of rain 20 percent. Heat index values up to 112. .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. Humid with lows around 70. Northwest winds around 5 mph. Chance of rain 40 percent. Heat index values up to 108 early in the evening. .MONDAY...Mostly sunny. Not as warm with highs in the mid 80s. North winds around 5 mph. .MONDAY NIGHT AND TUESDAY...Mostly clear. Lows in the mid 60s. 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...Partly sunny. A chance of showers in the morning, then a slight chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 30 percent. Heat index values up to 105. .WEDNESDAY NIGHT...Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. Highs in the mid 80s. $$