


Zone Forecast Product
Issued by NWS St. Louis, MO
Issued by NWS St. Louis, MO
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712 FPUS53 KLSX 182120 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 420 PM CDT Mon Aug 18 2025 ILZ100-101-MOZ061-063-064-190500- 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 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT TUESDAY... .TONIGHT...Mostly clear with a slight chance of showers and thunderstorms this evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the mid 70s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 105 early this evening. .TUESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the lower 90s. Southwest winds around 5 mph, becoming northwest in the afternoon. Chance of rain 20 percent. Heat index values up to 105. .TUESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Humid with lows in the lower 70s. North winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 101 early in the evening. .WEDNESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows in the mid 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the mid 80s. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Mostly clear. Lows in the upper 60s. Highs in the upper 80s. .SATURDAY...Mostly sunny. Highs in the upper 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the lower 60s. Highs in the lower 80s. .SUNDAY NIGHT AND MONDAY...Partly cloudy. Lows in the upper 50s. Highs in the upper 70s. $$ MOZ049-190500- Osage MO- 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT TUESDAY... .TONIGHT...Mostly cloudy this evening, then clearing. A chance of showers and thunderstorms. Lows in the lower 70s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 100 early this evening. .TUESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the mid 90s. West winds around 5 mph, becoming northwest in the afternoon. Chance of rain 20 percent. Heat index values up to 101. .TUESDAY NIGHT...Mostly clear with a chance of showers and thunderstorms in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. North winds around 5 mph. Chance of rain 40 percent. .WEDNESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs in the upper 80s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly clear. Lows in the mid 60s. Northeast winds 5 to 10 mph. .THURSDAY...Sunny. Highs in the mid 80s. .THURSDAY NIGHT...Clear. Lows in the mid 60s. .FRIDAY THROUGH SATURDAY...Mostly clear. Highs in the upper 80s. Lows in the mid 60s. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows in the upper 50s. Highs in the lower 80s. .MONDAY...Mostly sunny. Highs in the upper 70s. $$ MOZ042-050-190500- Audrain MO-Callaway MO- Including the cities of Mexico and Fulton 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .TONIGHT...Partly cloudy. A slight chance of showers and thunderstorms this evening, then a chance of showers and thunderstorms after midnight. Lows in the lower 70s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 102 early this evening. .TUESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the lower 90s. West winds around 5 mph, becoming north in the afternoon. Chance of rain 20 percent. Heat index values up to 100. .TUESDAY NIGHT...Mostly clear with a chance of showers and thunderstorms in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Humid with lows around 70. North winds 5 to 10 mph. Chance of rain 40 percent. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly clear. Lows in the mid 60s. Northeast winds 5 to 10 mph. .THURSDAY...Sunny. Highs in the mid 80s. .THURSDAY NIGHT...Clear. Lows in the mid 60s. .FRIDAY AND FRIDAY NIGHT...Mostly clear. Highs in the mid 80s. Lows in the mid 60s. .SATURDAY...Mostly sunny. Highs in the lower 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the upper 50s. Highs in the upper 70s. .SUNDAY NIGHT AND MONDAY...Partly cloudy. Lows in the mid 50s. Highs in the mid 70s. $$ MOZ047-048-190500- Moniteau MO-Cole MO- Including the city of Jefferson City 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT TUESDAY... .TONIGHT...Mostly cloudy with a slight chance of showers and thunderstorms this evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the lower 70s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 103 early this evening. .TUESDAY...Mostly sunny. A chance of showers and thunderstorms, mainly in the morning. Highs in the mid 90s. West winds around 5 mph, becoming northwest in the afternoon. Chance of rain 30 percent. Heat index values up to 102. .TUESDAY NIGHT...Mostly clear with a chance of showers and thunderstorms in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. North winds around 5 mph. Chance of rain 40 percent. Heat index values up to 101 early in the evening. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Northeast winds around 5 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly clear. Lows in the mid 60s. Northeast winds 5 to 10 mph. .THURSDAY...Sunny. Highs in the upper 80s. .THURSDAY NIGHT...Clear. Lows in the mid 60s. .FRIDAY AND FRIDAY NIGHT...Mostly clear. Highs around 90. Lows in the mid 60s. .SATURDAY...Mostly sunny. Highs in the upper 80s. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows in the upper 50s. Highs in the lower 80s. .MONDAY...Mostly sunny. Highs in the upper 70s. $$ MOZ041-190500- Boone MO- Including the city of Columbia 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .TONIGHT...Partly cloudy. A slight chance of showers and thunderstorms this evening, then a chance of showers and thunderstorms after midnight. Lows in the lower 70s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 105 early this evening. .TUESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Humid with highs in the lower 90s. West winds around 5 mph, becoming north in the afternoon. Chance of rain 20 percent. Heat index values up to 101. .TUESDAY NIGHT...Mostly clear with a chance of showers and thunderstorms in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Humid with lows in the lower 70s. Northeast winds 5 to 10 mph. Chance of rain 30 percent. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the upper 80s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly clear. Lows in the mid 60s. Northeast winds 5 to 10 mph. .THURSDAY...Sunny. Highs in the mid 80s. .THURSDAY NIGHT...Clear. Lows in the mid 60s. .FRIDAY AND FRIDAY NIGHT...Mostly clear. Highs in the upper 80s. Lows in the mid 60s. .SATURDAY...Mostly sunny. Highs in the mid 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows around 60. Highs in the upper 70s. .SUNDAY NIGHT AND MONDAY...Partly cloudy. Lows in the mid 50s. Highs in the mid 70s. $$ ILZ095>097-MOZ018-019-026-027-034>036-190500- Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Monroe MO-Ralls MO-Pike MO- Including the cities of Quincy, Mount Sterling, Pittsfield, Hannibal, and Bowling Green 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .TONIGHT...Partly cloudy with a slight chance of showers and thunderstorms this evening, then mostly cloudy with a chance of showers and thunderstorms after midnight. Lows in the lower 70s. Southwest winds around 5 mph. Chance of rain 40 percent. Heat index values up to 105 early this evening. .TUESDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Humid with highs in the upper 80s. Northwest winds 5 to 10 mph. Chance of rain 20 percent. .TUESDAY NIGHT...Partly cloudy. A slight chance of showers and thunderstorms in the evening. Humid with lows around 70. North winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY...Mostly sunny. Highs in the mid 80s. Northeast winds 5 to 10 mph. .WEDNESDAY NIGHT...Mostly clear. Lows in the mid 60s. Northeast winds 5 to 10 mph. .THURSDAY THROUGH FRIDAY...Mostly clear. Highs in the mid 80s. Lows in the mid 60s. .FRIDAY NIGHT AND SATURDAY...Partly cloudy. Lows in the mid 60s. Highs in the lower 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the upper 50s. Highs in the upper 70s. .SUNDAY NIGHT AND MONDAY...Partly cloudy. Lows in the mid 50s. Highs in the mid 70s. $$ ILZ069-070-074-190500- Clinton IL-Marion IL-Washington IL- Including the cities of Centralia and Salem 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT TUESDAY... .TONIGHT...Mostly clear. Lows in the mid 70s. South winds around 5 mph. Heat index values up to 105 early this evening. .TUESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the lower 90s. Southwest winds around 5 mph, becoming northwest in the afternoon. Chance of rain 20 percent. Heat index values up to 105. .TUESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Humid with lows in the lower 70s. North winds around 5 mph. Chance of rain 50 percent. Heat index values up to 102 early in the evening. .WEDNESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the upper 80s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the upper 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the upper 80s. .THURSDAY NIGHT THROUGH SATURDAY...Mostly clear. Lows in the upper 60s. Highs in the upper 80s. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows in the upper 50s. Highs in the lower 80s. .MONDAY...Mostly sunny. Highs in the upper 70s. $$ MOZ074-084-085-099-190500- Saint Francois MO-Iron MO-Madison MO-Reynolds MO- Including the city of Farmington 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT TUESDAY... .TONIGHT...Partly cloudy with a slight chance of showers and thunderstorms this evening, then mostly clear after midnight. Lows in the lower 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 101 early this evening. .TUESDAY...Mostly sunny. A chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Southwest winds around 5 mph, becoming northwest around 5 mph in the afternoon. Chance of rain 50 percent. Heat index values up to 105. .TUESDAY NIGHT...Partly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Humid with lows around 70. North winds around 5 mph. Chance of rain 50 percent. .WEDNESDAY...Partly sunny with a chance of showers and thunderstorms. Highs in the upper 80s. North winds around 5 mph. Chance of rain 40 percent. .WEDNESDAY NIGHT...Partly cloudy. Lows in the mid 60s. Northeast winds around 5 mph. .THURSDAY...Mostly sunny. Highs in the upper 80s. .THURSDAY NIGHT THROUGH SATURDAY NIGHT...Mostly clear. Lows in the lower 60s. Highs in the upper 80s. .SUNDAY...Sunny. Highs in the lower 80s. .SUNDAY NIGHT AND MONDAY...Partly cloudy. Lows in the upper 50s. Highs in the upper 70s. $$ MOZ060-190500- Warren MO- 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT TUESDAY... .TONIGHT...Partly cloudy. A slight chance of showers and thunderstorms this evening, then a chance of showers and thunderstorms after midnight. Lows in the lower 70s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 102 early this evening. .TUESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the lower 90s. West winds around 5 mph, becoming northwest in the afternoon. Chance of rain 20 percent. Heat index values up to 102. .TUESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Humid with lows around 70. North winds around 5 mph. Chance of rain 40 percent. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly clear. Lows in the mid 60s. Northeast winds around 5 mph. .THURSDAY...Mostly sunny. Highs in the mid 80s. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Mostly clear. Lows in the mid 60s. Highs in the upper 80s. .SATURDAY...Mostly sunny. Highs in the mid 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows around 60. Highs in the upper 70s. .SUNDAY NIGHT AND MONDAY...Partly cloudy. Lows in the mid 50s. Highs in the mid 70s. $$ MOZ051-052-190500- Montgomery MO-Lincoln MO- 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .TONIGHT...Partly cloudy. A slight chance of showers and thunderstorms this evening, then a chance of showers and thunderstorms after midnight. Lows in the lower 70s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 104 early this evening. .TUESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the lower 90s. West winds around 5 mph, becoming northwest in the afternoon. Chance of rain 20 percent. Heat index values up to 102. .TUESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Humid with lows around 70. North winds around 5 mph. Chance of rain 40 percent. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly clear. Lows in the mid 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the mid 80s. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Mostly clear. Lows in the mid 60s. Highs in the mid 80s. .SATURDAY...Mostly sunny. Highs in the mid 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the upper 50s. Highs in the upper 70s. .SUNDAY NIGHT AND MONDAY...Partly cloudy. Lows in the mid 50s. Highs in the mid 70s. $$ ILZ058-059-098-099-190500- Greene IL-Macoupin IL-Calhoun IL-Jersey IL- 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .TONIGHT...Mostly clear with a slight chance of showers and thunderstorms this evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the lower 70s. South winds around 5 mph. Chance of rain 40 percent. Heat index values up to 103 early this evening. .TUESDAY...Mostly sunny. A chance of showers and thunderstorms, mainly in the morning. Humid with highs in the lower 90s. West winds around 5 mph, becoming northwest in the afternoon. Chance of rain 30 percent. Heat index values up to 100. .TUESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms in the evening, then a slight chance of showers after midnight. Humid with lows in the lower 70s. North winds around 5 mph. Chance of rain 40 percent. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly clear. Lows in the mid 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the mid 80s. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Mostly clear. Lows in the mid 60s. Highs in the mid 80s. .SATURDAY...Mostly sunny. Highs in the mid 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows around 60. Highs in the upper 70s. .SUNDAY NIGHT AND MONDAY...Mostly clear. Lows in the mid 50s. Highs in the mid 70s. $$ ILZ064-065-190500- Bond IL-Fayette IL- Including the city of Vandalia 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT TUESDAY... .TONIGHT...Mostly clear this evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the lower 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 102 early this evening. .TUESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the lower 90s. Southwest winds around 5 mph, becoming northwest in the afternoon. Chance of rain 20 percent. Heat index values up to 103. .TUESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Humid with lows in the lower 70s. North winds around 5 mph. Chance of rain 40 percent. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the mid 80s. .THURSDAY NIGHT THROUGH SATURDAY...Mostly clear. Lows in the mid 60s. Highs in the upper 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows around 60. Highs around 80. .SUNDAY NIGHT AND MONDAY...Mostly clear. Lows in the mid 50s. Highs in the upper 70s. $$ ILZ060-190500- Montgomery IL- Including the city of Litchfield 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT THIS EVENING... .TONIGHT...Mostly clear with a slight chance of showers and thunderstorms this evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the lower 70s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 102 early this evening. .TUESDAY...Mostly sunny. A chance of showers and thunderstorms, mainly in the morning. Humid with highs around 90. Southwest winds around 5 mph, becoming northwest in the afternoon. Chance of rain 30 percent. Heat index values up to 100. .TUESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms in the evening. Humid with lows around 70. North winds around 5 mph. Chance of rain 30 percent. .WEDNESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. .WEDNESDAY NIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows in the mid 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the mid 80s. .THURSDAY NIGHT THROUGH SATURDAY...Mostly clear. Lows in the mid 60s. Highs in the mid 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the upper 50s. Highs in the upper 70s. .SUNDAY NIGHT AND MONDAY...Mostly clear. Lows in the mid 50s. Highs in the mid 70s. $$ ILZ079-MOZ075-190500- Randolph IL-Sainte Genevieve MO- Including the cities of Chester and Sparta 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT TUESDAY... .TONIGHT...Mostly clear this evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 103 early this evening. .TUESDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Southwest winds around 5 mph, becoming northwest around 5 mph in the afternoon. Chance of rain 40 percent. Heat index values up to 107. .TUESDAY NIGHT...Partly cloudy with a chance of showers. A chance of thunderstorms, mainly in the evening. Humid with lows in the lower 70s. North winds around 5 mph. Chance of rain 50 percent. Heat index values up to 103 early in the evening. .WEDNESDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Humid with highs in the upper 80s. North winds 5 to 10 mph. Chance of rain 40 percent. .WEDNESDAY NIGHT...Partly cloudy. Lows in the upper 60s. North winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the upper 80s. .THURSDAY NIGHT THROUGH SATURDAY NIGHT...Mostly clear. Lows in the mid 60s. Highs around 90. .SUNDAY AND SUNDAY NIGHT...Mostly clear. Highs in the lower 80s. Lows in the upper 50s. .MONDAY...Mostly sunny. Highs around 80. $$ MOZ059-062-072-073-190500- Gasconade MO-Franklin MO-Crawford MO-Washington MO- Including the cities of Washington, Union, and Sullivan 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT TUESDAY... .TONIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly this evening. Lows in the lower 70s. South winds around 5 mph. Chance of rain 30 percent. Heat index values up to 101 early this evening. .TUESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the mid 90s. West winds around 5 mph, becoming northwest around 5 mph in the afternoon. Chance of rain 20 percent. Heat index values up to 102. .TUESDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers. A chance of thunderstorms, mainly in the evening. Humid with lows around 70. North winds around 5 mph. Chance of rain 50 percent. .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 upper 80s. Northeast winds around 5 mph. Chance of rain 40 percent. .WEDNESDAY NIGHT...Mostly clear. Lows in the mid 60s. Northeast winds around 5 mph. .THURSDAY...Mostly sunny. Highs in the mid 80s. .THURSDAY NIGHT THROUGH SATURDAY...Mostly clear. Lows in the mid 60s. Highs in the upper 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the lower 60s. Highs in the lower 80s. .SUNDAY NIGHT AND MONDAY...Partly cloudy. Lows in the mid 50s. Highs in the upper 70s. $$ ILZ102-MOZ065-190500- Monroe IL-Jefferson MO- 420 PM CDT Mon Aug 18 2025 ...HEAT ADVISORY IN EFFECT UNTIL 8 PM CDT TUESDAY... .TONIGHT...Partly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 70s. South winds around 5 mph. Chance of rain 20 percent. Heat index values up to 106 early this evening. .TUESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the mid 90s. West winds around 5 mph, becoming northwest around 5 mph in the afternoon. Chance of rain 20 percent. Heat index values up to 106. .TUESDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers. A chance of thunderstorms, mainly in the evening. Humid with lows in the lower 70s. North winds around 5 mph. Chance of rain 50 percent. Heat index values up to 102 early in the evening. .WEDNESDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Humid with highs in the upper 80s. North winds 5 to 10 mph. Chance of rain 30 percent. .WEDNESDAY NIGHT...Partly cloudy. Lows in the mid 60s. Northeast winds around 5 mph. .THURSDAY...Mostly sunny. Highs in the upper 80s. .THURSDAY NIGHT THROUGH SATURDAY...Mostly clear. Lows in the upper 60s. Highs in the upper 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the lower 60s. Highs in the lower 80s. .SUNDAY NIGHT AND MONDAY...Partly cloudy. Lows in the upper 50s. Highs in the upper 70s. $$