Zone Forecast Product
Issued by NWS St. Louis, MO
Issued by NWS St. Louis, MO
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221 FPUS53 KLSX 161138 ZFPLSX Zone Forecasts National Weather Service Saint Louis MO 637 AM CDT Sun Aug 16 2026 ILZ100-101-MOZ061-063-064-161900- 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 637 AM CDT Sun Aug 16 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Partly sunny. A chance of showers and thunderstorms, mainly this morning. Highs in the lower 90s. West winds 5 to 10 mph. Gusts up to 20 mph this morning. Chance of rain 40 percent. Heat index values up to 111 this afternoon. .TONIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Humid with lows in the lower 70s. North winds 5 to 10 mph. Chance of rain 50 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...Mostly clear. Lows in the mid 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs in the upper 80s. South winds around 5 mph. .TUESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 50 percent. .WEDNESDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the upper 80s. Chance of rain 50 percent. .WEDNESDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of thunderstorms. A chance of showers. Lows in the upper 60s. Chance of rain 50 percent. .THURSDAY...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. .THURSDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers after midnight. Lows in the mid 60s. Chance of rain 30 percent. .FRIDAY THROUGH SATURDAY...Partly cloudy. Highs in the mid 80s. Lows in the mid 60s. $$ MOZ049-050-161900- Osage MO-Callaway MO- Including the city of Fulton 637 AM CDT Sun Aug 16 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Partly sunny. A chance of showers and thunderstorms, mainly this morning. Highs in the lower 90s. West winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 105. .TONIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Humid with lows in the upper 60s. North winds 5 to 10 mph. Chance of rain 40 percent. Heat index values up to 100 early in the evening. .MONDAY...Sunny. Highs in the mid 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. Northeast winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs around 90. South winds around 5 mph. .TUESDAY NIGHT...Mostly clear with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 50 percent. .WEDNESDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20 percent. .WEDNESDAY NIGHT AND THURSDAY...Mostly cloudy. A chance of showers and thunderstorms. Lows in the upper 60s. Highs in the lower 80s. Chance of rain 50 percent. .THURSDAY NIGHT...Partly cloudy in the evening, then mostly clear with a slight chance of showers after midnight. Lows in the mid 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. Highs in the mid 80s. .FRIDAY NIGHT AND SATURDAY...Mostly clear. Lows in the mid 60s. Highs in the mid 80s. $$ MOZ042-161900- Audrain MO- Including the city of Mexico 637 AM CDT Sun Aug 16 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Partly sunny with a chance of showers and thunderstorms. Highs in the mid 80s. West winds 5 to 10 mph. Chance of rain 50 percent. .TONIGHT...Mostly cloudy with a chance of showers and thunderstorms in the evening, then partly cloudy after midnight. Lows in the mid 60s. North winds 5 to 10 mph. Chance of rain 40 percent. .MONDAY...Sunny. Highs in the lower 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Mostly clear. Lows in the lower 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Mostly sunny. Highs in the mid 80s. South winds around 5 mph. .TUESDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with showers likely with a chance of thunderstorms 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 30 percent. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the mid 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 70s. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy in the evening, then mostly clear with a slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY...Mostly sunny. Highs in the lower 80s. .FRIDAY NIGHT...Mostly clear. Lows in the mid 60s. .SATURDAY...Mostly sunny. Highs in the lower 80s. $$ MOZ041-047-048-161900- Boone MO-Moniteau MO-Cole MO- Including the cities of Columbia and Jefferson City 637 AM CDT Sun Aug 16 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Partly sunny with a chance of showers and thunderstorms. Highs in the lower 90s. West winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 104. .TONIGHT...Partly cloudy. A chance of showers and thunderstorms in the evening. Humid with lows in the upper 60s. North winds 5 to 10 mph. Chance of rain 40 percent. .MONDAY...Sunny. Highs in the mid 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. Northeast winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs in the lower 90s. South winds around 5 mph. Heat index values up to 100 in the afternoon. .TUESDAY NIGHT...Mostly clear with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the lower 70s. Chance of rain 50 percent. .WEDNESDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20 percent. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the upper 60s. Chance of rain 50 percent. .THURSDAY...Partly sunny. A chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 50 percent. .THURSDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 60s. .FRIDAY...Mostly sunny. Highs in the mid 80s. .FRIDAY NIGHT AND SATURDAY...Mostly clear. Lows in the upper 60s. Highs in the upper 80s. $$ ILZ095>097-MOZ018-019-026-027-034-161900- Adams IL-Brown IL-Pike IL-Knox MO-Lewis MO-Shelby MO-Marion MO- Monroe MO- Including the cities of Quincy, Mount Sterling, Pittsfield, and Hannibal 637 AM CDT Sun Aug 16 2026 .TODAY...Mostly cloudy this morning, then becoming partly sunny. A chance of showers and thunderstorms. Highs in the mid 80s. West winds 5 to 10 mph. Gusts up to 20 mph this morning. Chance of rain 50 percent. .TONIGHT...Mostly cloudy with a chance of showers and thunderstorms in the evening, then partly cloudy after midnight. Lows in the mid 60s. North winds 5 to 10 mph. Gusts up to 25 mph in the evening. Chance of rain 40 percent. .MONDAY...Sunny. Highs in the lower 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Mostly sunny. Highs in the mid 80s. Southwest winds around 5 mph. .TUESDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms in the evening, then mostly cloudy with showers likely with a slight chance of thunderstorms after midnight. Lows in the upper 60s. Chance of rain 70 percent. .WEDNESDAY...Mostly cloudy with a chance of showers with a slight chance of thunderstorms in the morning, then partly sunny in the afternoon. Highs in the lower 80s. Chance of rain 40 percent. .WEDNESDAY NIGHT...Mostly cloudy in the evening, then becoming partly cloudy. A slight chance of showers and thunderstorms. Lows in the mid 60s. Chance of rain 20 percent. .THURSDAY...Partly sunny. Highs in the upper 70s. .THURSDAY NIGHT...Partly cloudy with a 20 percent chance of showers. Lows in the lower 60s. .FRIDAY...Mostly sunny. Highs in the lower 80s. .FRIDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 60s. .SATURDAY...Mostly sunny. Highs in the lower 80s. $$ MOZ035-036-161900- Ralls MO-Pike MO- Including the city of Bowling Green 637 AM CDT Sun Aug 16 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Mostly cloudy with a chance of showers and thunderstorms this morning, then partly sunny with a slight chance of showers and thunderstorms this afternoon. Highs in the upper 80s. West winds around 5 mph. Chance of rain 50 percent. Heat index values up to 100. .TONIGHT...Mostly cloudy with a chance of showers and thunderstorms in the evening, then partly cloudy after midnight. Lows in the upper 60s. North winds 5 to 10 mph. Gusts up to 25 mph in the evening. Chance of rain 40 percent. .MONDAY...Sunny. Highs in the lower 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs in the mid 80s. Southwest winds around 5 mph. .TUESDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly cloudy with showers likely with a chance of thunderstorms after midnight. Lows around 70. Chance of rain 70 percent. .WEDNESDAY...Mostly cloudy with a chance of showers and thunderstorms in the morning, then partly sunny in the afternoon. Highs in the lower 80s. Chance of rain 40 percent. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the mid 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs around 80. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY THROUGH SATURDAY...Partly cloudy. Highs in the lower 80s. Lows in the mid 60s. $$ ILZ069-070-074-161900- Clinton IL-Marion IL-Washington IL- Including the cities of Centralia and Salem 637 AM CDT Sun Aug 16 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Partly sunny. A chance of showers and thunderstorms this morning. Highs in the lower 90s. West winds 5 to 10 mph. Gusts up to 20 mph this morning. Chance of rain 40 percent. Heat index values up to 112 this afternoon. .TONIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Humid with lows in the lower 70s. Northwest winds around 5 mph. Chance of rain 50 percent. Heat index values up to 109 early in the evening. .MONDAY...Mostly sunny. Highs in the mid 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Partly cloudy in the evening, then clearing. Lows in the mid 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs in the upper 80s. Light and variable winds. .TUESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 50 percent. .WEDNESDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the upper 80s. Chance of rain 50 percent. .WEDNESDAY NIGHT...Partly cloudy with a chance of thunderstorms. A chance of showers. Lows in the upper 60s. Chance of rain 50 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 50 percent. .THURSDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers after midnight. Lows in the mid 60s. Chance of rain 30 percent. .FRIDAY...Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 20 percent. .FRIDAY NIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows in the mid 60s. .SATURDAY...Mostly sunny. Highs in the mid 80s. $$ MOZ074-084-085-099-161900- Saint Francois MO-Iron MO-Madison MO-Reynolds MO- Including the city of Farmington 637 AM CDT Sun Aug 16 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Mostly sunny. Hot with highs in the upper 90s. West winds 5 to 10 mph. Gusts up to 20 mph this morning. Heat index values up to 110. .TONIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Humid with lows in the lower 70s. West winds around 5 mph with gusts up to 20 mph, becoming north after midnight. Chance of rain 40 percent. Heat index values up to 104 early in the evening. .MONDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Not as warm. Humid with highs in the upper 80s. North winds around 5 mph. Chance of rain 20 percent. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs in the lower 90s. Light and variable winds. Heat index values up to 100 in the afternoon. .TUESDAY NIGHT AND WEDNESDAY...Partly cloudy. A slight chance of showers and thunderstorms. Lows around 70. Highs in the lower 90s. Chance of rain 20 percent. Heat index values up to 105. .WEDNESDAY NIGHT AND THURSDAY...Mostly cloudy. A chance of showers and thunderstorms. Lows in the upper 60s. Highs in the mid 80s. Chance of rain 50 percent. .THURSDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Lows in the mid 60s. Chance of rain 40 percent. .FRIDAY...Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the mid 80s. Chance of rain 20 percent. .FRIDAY NIGHT...Partly cloudy with a slight chance of showers and thunderstorms in the evening, then mostly clear after midnight. Lows in the mid 60s. Chance of rain 20 percent. .SATURDAY...Sunny. Highs in the mid 80s. $$ MOZ051-060-161900- Montgomery MO-Warren MO- 637 AM CDT Sun Aug 16 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Partly sunny. A chance of showers and thunderstorms, mainly this morning. Highs around 90. West winds around 5 mph. Chance of rain 50 percent. Heat index values up to 107 this afternoon. .TONIGHT...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 40 percent. Heat index values up to 101 early in the evening. .MONDAY...Sunny. Highs in the lower 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Mostly clear. Lows in the lower 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs in the upper 80s. South winds around 5 mph in the morning, becoming light and variable. .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 mid 80s. Chance of rain 50 percent. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the mid 60s. Chance of rain 50 percent. .THURSDAY...Partly sunny. A chance of showers and thunderstorms in the morning. Highs in the lower 80s. Chance of rain 50 percent. .THURSDAY NIGHT...Partly cloudy in the evening, then clearing. A slight chance of thunderstorms in the evening. A slight chance of showers. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY THROUGH SATURDAY...Partly cloudy. Highs in the mid 80s. Lows in the lower 60s. $$ MOZ052-161900- Lincoln MO- 637 AM CDT Sun Aug 16 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Partly sunny. A chance of showers and thunderstorms, mainly this morning. Highs in the upper 80s. West winds around 5 mph. Chance of rain 50 percent. Heat index values up to 106. .TONIGHT...Partly cloudy. A chance of showers and thunderstorms, mainly in the evening. Humid with lows in the upper 60s. North winds around 5 mph. Gusts up to 20 mph in the evening. Chance of rain 40 percent. Heat index values up to 101 early in the evening. .MONDAY...Sunny. Highs in the mid 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs in the upper 80s. South winds around 5 mph. .TUESDAY NIGHT...Partly cloudy. Showers likely with a chance of thunderstorms after midnight. Lows around 70. Chance of rain 60 percent. .WEDNESDAY...Partly sunny. A chance of showers with a slight chance of thunderstorms in the morning. Highs in the mid 80s. Chance of rain 50 percent. .WEDNESDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows in the mid 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the lower 80s. Chance of rain 20 percent. .THURSDAY NIGHT...Partly cloudy. A slight chance of showers after midnight. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY THROUGH SATURDAY...Partly cloudy. Highs in the mid 80s. Lows in the mid 60s. $$ ILZ058-059-098-099-161900- Greene IL-Macoupin IL-Calhoun IL-Jersey IL- 637 AM CDT Sun Aug 16 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Mostly cloudy with a chance of showers and thunderstorms this morning, then partly sunny with a slight chance of showers and thunderstorms this afternoon. Highs in the upper 80s. West winds 5 to 10 mph. Gusts up to 20 mph this morning. Chance of rain 50 percent. Heat index values up to 102. .TONIGHT...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 50 percent. .MONDAY...Mostly sunny. Highs in the mid 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Mostly clear. Lows in the lower 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs in the upper 80s. Southwest winds around 5 mph. .TUESDAY NIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A slight chance of thunderstorms. A slight chance of showers in the evening, then showers likely after midnight. Lows in the upper 60s. Chance of rain 70 percent. .WEDNESDAY...Mostly cloudy in the morning, then becoming partly sunny. A slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the mid 80s. Chance of rain 50 percent. .WEDNESDAY NIGHT...Partly cloudy with a chance of showers and thunderstorms. Lows in the mid 60s. Chance of rain 40 percent. .THURSDAY...Partly sunny with a slight chance of showers and thunderstorms. Highs in the lower 80s. Chance of rain 20 percent. .THURSDAY NIGHT...A slight chance of thunderstorms in the evening. Partly cloudy with a slight chance of showers. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs in the lower 80s. Lows in the lower 60s. .SATURDAY...Sunny. Highs in the mid 80s. $$ ILZ060-064-065-161900- Montgomery IL-Bond IL-Fayette IL- Including the cities of Litchfield and Vandalia 637 AM CDT Sun Aug 16 2026 ...HEAT ADVISORY IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Mostly cloudy with a chance of showers and thunderstorms this morning, then partly sunny with a slight chance of showers and thunderstorms this afternoon. Highs in the upper 80s. West winds 5 to 10 mph with gusts up to 20 mph. Chance of rain 50 percent. Heat index values up to 105 this afternoon. .TONIGHT...Partly cloudy with a chance of showers and thunderstorms. Humid with lows around 70. Northwest winds around 5 mph. Chance of rain 50 percent. Heat index values up to 101 early in the evening. .MONDAY...Mostly sunny. Highs in the mid 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Partly cloudy in the evening, then becoming mostly clear. Lows in the lower 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs in the mid 80s. Light and variable winds, becoming southwest around 5 mph in the afternoon. .TUESDAY NIGHT...Partly cloudy with a slight chance of thunderstorms. A slight chance of showers in the evening, then a chance of showers after midnight. Lows in the upper 60s. Chance of rain 50 percent. .WEDNESDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the mid 80s. Chance of rain 50 percent. .WEDNESDAY NIGHT...Partly cloudy with a chance of thunderstorms. A chance of showers. Lows in the mid 60s. Chance of rain 50 percent. .THURSDAY...Partly sunny. A slight chance of showers and thunderstorms in the morning. Highs around 80. Chance of rain 20 percent. .THURSDAY NIGHT...A slight chance of thunderstorms in the evening. Partly cloudy with a slight chance of showers. Lows in the lower 60s. Chance of rain 20 percent. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs in the lower 80s. Lows in the lower 60s. .SATURDAY...Sunny. Highs in the lower 80s. $$ ILZ079-MOZ075-161900- Randolph IL-Sainte Genevieve MO- Including the cities of Chester and Sparta 637 AM CDT Sun Aug 16 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Mostly sunny. Hot with highs in the mid 90s. West winds 5 to 10 mph. Heat index values up to 115 this afternoon. .TONIGHT...Mostly 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 109 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 5 to 10 mph. Chance of rain 20 percent. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs in the upper 80s. Light and variable winds. .TUESDAY NIGHT...Mostly clear in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 40 percent. .WEDNESDAY...Mostly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs around 90. Chance of rain 50 percent. Heat index values up to 105 in the afternoon. .WEDNESDAY NIGHT AND THURSDAY...Mostly cloudy. A chance of showers and thunderstorms. Lows in the upper 60s. Highs in the lower 80s. Chance of rain 50 percent. .THURSDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers after midnight. Lows in the mid 60s. Chance of rain 30 percent. .FRIDAY...Mostly sunny. A slight chance of showers in the morning. Highs in the lower 80s. Chance of rain 20 percent. .FRIDAY NIGHT...Mostly clear in the evening, then becoming partly cloudy. Lows in the mid 60s. .SATURDAY...Sunny. Highs in the mid 80s. $$ MOZ059-062-072-073-161900- Gasconade MO-Franklin MO-Crawford MO-Washington MO- Including the cities of Washington, Union, and Sullivan 637 AM CDT Sun Aug 16 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Mostly sunny. A slight chance of showers and thunderstorms this morning. Highs in the mid 90s. West winds around 5 mph. Gusts up to 20 mph this morning. Chance of rain 20 percent. Heat index values up to 109. .TONIGHT...Partly cloudy in the evening, then becoming mostly cloudy. A chance of showers and thunderstorms. Humid with lows around 70. North winds around 5 mph. Gusts up to 20 mph in the evening. Chance of rain 40 percent. Heat index values up to 103 early in the evening. .MONDAY...Mostly sunny. Highs in the mid 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs in the lower 90s. South winds around 5 mph in the morning, becoming light and variable. .TUESDAY NIGHT...Mostly clear in the evening, then partly cloudy with a chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 50 percent. .WEDNESDAY...Mostly sunny with a slight chance of showers and thunderstorms. Highs around 90. Chance of rain 20 percent. Heat index values up to 100. .WEDNESDAY NIGHT AND THURSDAY...Mostly cloudy. A chance of showers and thunderstorms. Lows in the upper 60s. Highs in the lower 80s. Chance of rain 50 percent. .THURSDAY NIGHT...A slight chance of thunderstorms in the evening. Partly cloudy with a slight chance of showers. Lows in the mid 60s. Chance of rain 20 percent. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs in the mid 80s. Lows in the mid 60s. .SATURDAY...Sunny. Highs in the mid 80s. $$ ILZ102-MOZ065-161900- Monroe IL-Jefferson MO- 637 AM CDT Sun Aug 16 2026 ...EXTREME HEAT WARNING IN EFFECT UNTIL 9 PM CDT THIS EVENING... .TODAY...Partly sunny. A slight chance of showers and thunderstorms this morning. Hot with highs in the mid 90s. Northwest winds around 5 mph. Gusts up to 20 mph this morning. Chance of rain 20 percent. Heat index values up to 114 this afternoon. .TONIGHT...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. Gusts up to 20 mph in the evening. Chance of rain 40 percent. Heat index values up to 108 early in the evening. .MONDAY...Mostly sunny. Humid with highs in the mid 80s. North winds 5 to 10 mph. .MONDAY NIGHT...Mostly clear. Lows in the mid 60s. North winds around 5 mph in the evening, becoming light and variable. .TUESDAY...Sunny. Highs around 90. Light and variable winds. Heat index values up to 100 in the afternoon. .TUESDAY NIGHT...Partly cloudy. A chance of showers and thunderstorms after midnight. Lows around 70. Chance of rain 50 percent. .WEDNESDAY...Partly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the upper 80s. Chance of rain 50 percent. Heat index values up to 100 in the afternoon. .WEDNESDAY NIGHT AND THURSDAY...Mostly cloudy. A chance of showers and thunderstorms. Lows in the upper 60s. Highs in the lower 80s. Chance of rain 50 percent. .THURSDAY NIGHT...Mostly cloudy with a slight chance of showers and thunderstorms in the evening, then partly cloudy with a chance of showers after midnight. Lows in the mid 60s. Chance of rain 30 percent. .FRIDAY AND FRIDAY NIGHT...Partly cloudy. Highs in the mid 80s. Lows in the mid 60s. .SATURDAY...Sunny. Highs in the mid 80s. $$