Zone Forecast Product
Issued by NWS St. Louis, MO
Issued by NWS St. Louis, MO
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642 FPUS53 KLSX 210753 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 252 AM CDT Tue Jul 21 2026 ILZ100-101-MOZ061-063-064-211500- 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 252 AM CDT Tue Jul 21 2026 ...HEAT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... .TODAY...Partly sunny with a slight chance of showers and thunderstorms this morning, then sunny this afternoon. Highs in the mid 90s. Northwest winds 10 to 15 mph. Chance of rain 20 percent. Heat index values up to 105. .TONIGHT...Mostly clear. Cooler with lows in the upper 60s. North winds 10 to 15 mph. .WEDNESDAY...Mostly sunny. Cooler with highs in the lower 80s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the lower 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the lower 80s. East winds around 5 mph. .THURSDAY NIGHT...Partly cloudy. Lows in the lower 60s. .FRIDAY...Partly sunny in the morning, then becoming mostly cloudy. A chance of showers. A slight chance of thunderstorms in the afternoon. Highs around 80. Chance of rain 40 percent. .FRIDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Lows in the mid 60s. Chance of rain 20 percent. .SATURDAY...Mostly sunny. Highs in the upper 80s. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 105. .MONDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 100. $$ MOZ049-050-211500- Osage MO-Callaway MO- Including the city of Fulton 252 AM CDT Tue Jul 21 2026 ...HEAT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... .TODAY...Mostly sunny. Highs in the lower 90s. Northwest winds 10 to 15 mph. .TONIGHT...Mostly clear. Cooler with lows in the upper 60s. North winds 10 to 15 mph. .WEDNESDAY...Mostly sunny. Cooler with highs in the lower 80s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows in the lower 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs around 80. East winds around 5 mph. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...A chance of thunderstorms. Showers likely, mainly in the morning. Highs in the upper 70s. Chance of rain 60 percent. .FRIDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Lows in the mid 60s. Chance of rain 20 percent. .SATURDAY...Mostly sunny. Highs in the upper 80s. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows in the lower 70s. Highs in the lower 90s. Heat index values up to 105. .MONDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 100. $$ MOZ042-211500- Audrain MO- Including the city of Mexico 252 AM CDT Tue Jul 21 2026 .TODAY...Mostly sunny. A slight chance of showers and thunderstorms this morning. Highs around 90. Northwest winds 10 to 15 mph. Chance of rain 20 percent. .TONIGHT...Mostly clear. Cooler with lows in the mid 60s. North winds 10 to 15 mph. .WEDNESDAY...Mostly sunny. Highs in the lower 80s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows in the lower 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the upper 70s. East winds around 5 mph. .THURSDAY NIGHT...Mostly cloudy. A slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...Mostly cloudy with a chance of thunderstorms. A chance of showers. Highs in the mid 70s. Chance of rain 50 percent. .FRIDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 60s. Chance of rain 20 percent. .SATURDAY...Mostly sunny. Highs in the mid 80s. .SATURDAY NIGHT THROUGH MONDAY...Mostly clear. Lows in the upper 60s. Highs in the lower 90s. $$ MOZ041-047-048-211500- Boone MO-Moniteau MO-Cole MO- Including the cities of Columbia and Jefferson City 252 AM CDT Tue Jul 21 2026 ...HEAT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... .TODAY...Mostly sunny. Highs in the mid 90s. Northwest winds 10 to 15 mph. .TONIGHT...Mostly clear. Cooler with lows in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY...Mostly sunny. Highs in the mid 80s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows in the mid 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the lower 80s. East winds around 5 mph. .THURSDAY NIGHT...Mostly cloudy. A chance of showers with a slight chance of thunderstorms after midnight. Lows in the mid 60s. Chance of rain 40 percent. .FRIDAY...A chance of thunderstorms. Showers likely, mainly in the morning. Highs in the upper 70s. Chance of rain 70 percent. .FRIDAY NIGHT...Mostly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Lows in the mid 60s. Chance of rain 50 percent. .SATURDAY...Mostly sunny. Highs in the upper 80s. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows in the lower 70s. Highs in the mid 90s. Heat index values up to 105. .MONDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 100. $$ ILZ095>097-MOZ018-019-026-027-034>036-211500- 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 252 AM CDT Tue Jul 21 2026 .TODAY...Mostly sunny. A chance of showers and thunderstorms this morning. Highs in the upper 80s. Northwest winds 10 to 15 mph with gusts up to 25 mph. Chance of rain 40 percent. .TONIGHT...Mostly clear. Cooler with lows in the mid 60s. North winds 10 to 15 mph with gusts up to 25 mph, diminishing to around 5 mph after midnight. .WEDNESDAY...Sunny in the morning, then becoming partly sunny. Highs around 80. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows around 60. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs around 80. East winds around 5 mph. .THURSDAY NIGHT...Mostly cloudy. A chance of showers after midnight. Lows in the lower 60s. Chance of rain 30 percent. .FRIDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers. Highs in the upper 70s. Chance of rain 50 percent. .FRIDAY NIGHT...Mostly cloudy. A slight chance of showers in the evening. Lows in the lower 60s. Chance of rain 20 percent. .SATURDAY...Mostly sunny. Highs in the mid 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the upper 60s. Highs in the lower 90s. Heat index values up to 100. .SUNDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 70s. Heat index values up to 100 early in the evening. .MONDAY...Sunny. Highs in the lower 90s. $$ ILZ069-074-211500- Clinton IL-Washington IL- 252 AM CDT Tue Jul 21 2026 ...HEAT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... .TODAY...Mostly sunny. A slight chance of showers and thunderstorms this morning. Highs in the lower 90s. West winds 5 to 10 mph, becoming northwest with gusts up to 20 mph this afternoon. Chance of rain 20 percent. Heat index values up to 108. .TONIGHT...Mostly clear. Lows in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY...Mostly sunny. Cooler with highs in the lower 80s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the lower 60s. Northeast winds 5 to 10 mph. .THURSDAY...Sunny. Highs in the upper 70s. Northeast winds around 5 mph. .THURSDAY NIGHT...Partly cloudy. Lows in the lower 60s. .FRIDAY...Partly sunny. A slight chance of showers in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 30 percent. .FRIDAY NIGHT...Mostly cloudy. A slight chance of showers and thunderstorms in the evening. Lows in the mid 60s. Chance of rain 20 percent. .SATURDAY...Mostly sunny. Highs in the mid 80s. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows around 70. Highs in the lower 90s. Heat index values up to 105. .MONDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100. $$ ILZ070-211500- Marion IL- Including the cities of Centralia and Salem 252 AM CDT Tue Jul 21 2026 .TODAY...Mostly sunny. A chance of showers and thunderstorms this morning. Highs in the lower 90s. West winds 5 to 10 mph, becoming northwest with gusts up to 20 mph this afternoon. Chance of rain 30 percent. Heat index values up to 105. .TONIGHT...Mostly clear. Lows in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY...Mostly sunny. Cooler with highs around 80. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then clearing. Lows in the upper 50s. Northeast winds 5 to 10 mph. .THURSDAY...Sunny. Highs in the upper 70s. Northeast winds around 5 mph. .THURSDAY NIGHT...Partly cloudy. Lows in the lower 60s. .FRIDAY...Partly sunny with a 20 percent chance of showers. Highs in the upper 70s. .FRIDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 60s. .SATURDAY...Mostly sunny. Highs in the mid 80s. .SATURDAY NIGHT...Mostly clear. Lows in the upper 60s. .SUNDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100 in the afternoon. .SUNDAY NIGHT AND MONDAY...Mostly clear. Lows in the lower 70s. Highs in the lower 90s. $$ MOZ074-084-085-099-211500- Saint Francois MO-Iron MO-Madison MO-Reynolds MO- Including the city of Farmington 252 AM CDT Tue Jul 21 2026 ...HEAT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... .TODAY...Mostly sunny. A slight chance of showers and thunderstorms this afternoon. Hot with highs in the mid 90s. West winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 20 percent. Heat index values up to 111. .TONIGHT...Mostly clear. Lows in the upper 60s. North winds 5 to 10 mph. Heat index values up to 100 early in the evening. .WEDNESDAY...Mostly sunny. Cooler with highs in the lower 80s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows in the lower 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs around 80. Northeast winds around 5 mph. .THURSDAY NIGHT...Partly cloudy. Lows in the lower 60s. .FRIDAY AND FRIDAY NIGHT...Mostly cloudy. A chance of showers and thunderstorms. Highs in the upper 70s. Lows in the lower 60s. Chance of rain 50 percent. .SATURDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 20 percent. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows around 70. Highs in the lower 90s. Heat index values up to 105. .MONDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 100. $$ MOZ051-060-211500- Montgomery MO-Warren MO- 252 AM CDT Tue Jul 21 2026 ...HEAT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... .TODAY...Partly sunny with a slight chance of showers and thunderstorms this morning, then sunny this afternoon. Highs in the lower 90s. Northwest winds 10 to 15 mph. Chance of rain 20 percent. Heat index values up to 100. .TONIGHT...Mostly clear. Cooler with lows in the mid 60s. North winds 10 to 15 mph, diminishing to around 5 mph after midnight. .WEDNESDAY...Mostly sunny. Cooler with highs in the lower 80s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows in the lower 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the lower 80s. East winds around 5 mph. .THURSDAY NIGHT...Mostly cloudy. Lows in the lower 60s. .FRIDAY...Partly sunny in the morning, then becoming mostly cloudy. A chance of showers. A slight chance of thunderstorms in the morning, then a chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 50 percent. .FRIDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 60s. Chance of rain 20 percent. .SATURDAY...Mostly sunny. Highs in the upper 80s. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows in the upper 60s. Highs in the lower 90s. Heat index values up to 100. .MONDAY...Mostly sunny. Highs in the lower 90s. Heat index values up to 100. $$ MOZ052-211500- Lincoln MO- 252 AM CDT Tue Jul 21 2026 .TODAY...Partly sunny with a slight chance of showers and thunderstorms this morning, then sunny this afternoon. Highs in the lower 90s. Northwest winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 101. .TONIGHT...Mostly clear. Cooler with lows in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY...Sunny in the morning, then becoming partly sunny. Cooler with highs in the lower 80s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then clearing. Lows in the lower 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the lower 80s. East winds around 5 mph. .THURSDAY NIGHT...Mostly cloudy. Lows in the lower 60s. .FRIDAY...Partly sunny in the morning, then becoming mostly cloudy. A chance of showers with a slight chance of thunderstorms. Highs in the upper 70s. Chance of rain 50 percent. .FRIDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 60s. Chance of rain 20 percent. .SATURDAY...Mostly sunny. Highs in the upper 80s. .SATURDAY NIGHT AND SUNDAY...Mostly clear. Lows in the upper 60s. Highs in the mid 90s. Heat index values up to 100. .SUNDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 70s. Heat index values up to 100 early in the evening. .MONDAY...Sunny. Highs in the lower 90s. Heat index values up to 100. $$ ILZ058-059-098-099-211500- Greene IL-Macoupin IL-Calhoun IL-Jersey IL- 252 AM CDT Tue Jul 21 2026 .TODAY...Partly sunny with a chance of showers and thunderstorms this morning, then sunny this afternoon. Highs in the lower 90s. Northwest winds 10 to 15 mph. Chance of rain 40 percent. Heat index values up to 100. .TONIGHT...Mostly clear. Cooler with lows in the mid 60s. North winds 10 to 15 mph. .WEDNESDAY...Mostly sunny. Cooler with highs around 80. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the upper 50s. Northeast winds 5 to 10 mph. .THURSDAY...Sunny. Highs around 80. East winds around 5 mph. .THURSDAY NIGHT...Mostly cloudy. Lows around 60. .FRIDAY...Partly sunny. A chance of showers in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of rain 40 percent. .FRIDAY NIGHT...Mostly cloudy. Lows in the lower 60s. .SATURDAY...Mostly sunny. Highs in the mid 80s. .SATURDAY NIGHT THROUGH MONDAY...Mostly clear. Lows in the upper 60s. Highs in the lower 90s. Heat index values up to 100. $$ ILZ060-064-065-211500- Montgomery IL-Bond IL-Fayette IL- Including the cities of Litchfield and Vandalia 252 AM CDT Tue Jul 21 2026 .TODAY...Mostly sunny. A chance of showers and thunderstorms this morning. Highs around 90. West winds 10 to 15 mph. Chance of rain 40 percent. Heat index values up to 101. .TONIGHT...Mostly clear. Cooler with lows in the mid 60s. Northwest winds 10 to 15 mph, becoming north around 5 mph after midnight. .WEDNESDAY...Mostly sunny. Cooler with highs in the upper 70s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the upper 50s. Northeast winds 5 to 10 mph. .THURSDAY...Sunny. Highs in the upper 70s. Northeast winds around 5 mph. .THURSDAY NIGHT...Partly cloudy. Lows in the upper 50s. .FRIDAY...Partly sunny with a 30 percent chance of showers. Highs in the upper 70s. .FRIDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 60s. .SATURDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the mid 80s. Chance of rain 20 percent. .SATURDAY NIGHT THROUGH MONDAY...Mostly clear. Lows in the upper 60s. Highs in the lower 90s. Heat index values up to 100. $$ ILZ079-MOZ075-211500- Randolph IL-Sainte Genevieve MO- Including the cities of Chester and Sparta 252 AM CDT Tue Jul 21 2026 ...HEAT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... .TODAY...Mostly sunny with a slight chance of showers. A slight chance of thunderstorms this afternoon. Hot with highs in the mid 90s. West winds 5 to 10 mph, becoming northwest with gusts up to 20 mph this afternoon. Chance of rain 20 percent. Heat index values up to 109. .TONIGHT...Mostly clear. Lows in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY...Mostly sunny. Cooler with highs in the lower 80s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. Lows in the lower 60s. Northeast winds 5 to 10 mph. .THURSDAY...Sunny. Highs around 80. Northeast winds around 5 mph. .THURSDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 60s. .FRIDAY AND FRIDAY NIGHT...Mostly cloudy. A chance of showers and thunderstorms. Highs around 80. Lows in the lower 60s. Chance of rain 40 percent. .SATURDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 20 percent. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows around 70. Highs in the lower 90s. Heat index values up to 105. .MONDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 100. $$ MOZ059-062-072-073-211500- Gasconade MO-Franklin MO-Crawford MO-Washington MO- Including the cities of Washington, Union, and Sullivan 252 AM CDT Tue Jul 21 2026 ...HEAT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... .TODAY...Mostly sunny. Hot with highs in the mid 90s. West winds 5 to 10 mph, becoming northwest with gusts up to 20 mph this afternoon. Heat index values up to 105. .TONIGHT...Mostly clear. Cooler with lows in the mid 60s. North winds 5 to 10 mph. .WEDNESDAY...Mostly sunny. Cooler with highs in the lower 80s. North winds around 5 mph. .WEDNESDAY NIGHT...Partly cloudy. Lows in the lower 60s. Northeast winds around 5 mph. .THURSDAY...Mostly sunny. Highs around 80. East winds around 5 mph. .THURSDAY NIGHT...Partly cloudy. Lows in the lower 60s. .FRIDAY AND FRIDAY NIGHT...Mostly cloudy. A chance of showers and thunderstorms. Highs in the upper 70s. Lows in the lower 60s. Chance of rain 50 percent. .SATURDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20 percent. .SATURDAY NIGHT THROUGH SUNDAY NIGHT...Mostly clear. Lows around 70. Highs in the mid 90s. Heat index values up to 100. .MONDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 100. $$ ILZ102-MOZ065-211500- Monroe IL-Jefferson MO- 252 AM CDT Tue Jul 21 2026 ...HEAT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING... .TODAY...Partly sunny this morning, then clearing. Hot with highs in the mid 90s. West winds 5 to 10 mph, becoming northwest with gusts up to 20 mph this afternoon. Heat index values up to 108. .TONIGHT...Mostly clear. Lows in the upper 60s. North winds 5 to 10 mph. .WEDNESDAY...Mostly sunny. Cooler with highs in the lower 80s. North winds 5 to 10 mph. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then clearing. Lows in the lower 60s. Northeast winds 5 to 10 mph. .THURSDAY...Mostly sunny. Highs in the lower 80s. East winds around 5 mph. .THURSDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. Lows in the lower 60s. .FRIDAY...Partly sunny with a chance of showers in the morning, then mostly cloudy with a chance of showers and thunderstorms in the afternoon. Highs around 80. Chance of rain 40 percent. .FRIDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms. Lows in the lower 60s. Chance of rain 20 percent. .SATURDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20 percent. .SATURDAY NIGHT...Mostly clear. Lows in the upper 60s. .SUNDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 105 in the afternoon. .SUNDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the lower 70s. Heat index values up to 105 early in the evening. .MONDAY...Mostly sunny. Highs in the mid 90s. Heat index values up to 105. $$