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St. Louis Regional, IL Weather Forecast
St. Louis Regional, IL Weather Forecast Date: 508 PM CDT Tue Aug 11 2026
The area/counties/county of: Madison County Il, including the cities of: Alton, Edwardsville, Belleville, Cahokia, Saint Charles, and Saint Louis.or toggle through each period.
Tonight... Partly cloudy. Lows in the upper 70s. Southwest winds 5 to 10 mph. Heat index values up to 107 early this evening.
Wednesday... Mostly sunny. Scattered showers and thunderstorms, mainly in the morning. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Chance of rain 40%. Heat index values up to 111.
Wednesday Night... Partly cloudy with isolated showers and thunderstorms. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 20%. Heat index values up to 110 early in the evening.
Thursday... Mostly sunny. Scattered showers and thunderstorms in the morning. Hot with highs in the mid 90s. Southwest winds around 5 mph. Chance of rain 40%. Heat index values up to 110.
Thursday Night... Partly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. Southeast winds around 5 mph. Chance of rain 20%. Heat index values up to 110 early in the evening.
Friday... Partly cloudy. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 110.
Friday Night... Partly cloudy. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 110.
Saturday... Mostly clear. Hot. Highs in the upper 90s. Lows in the upper 70s. Heat index values up to 110.
Sunday... Mostly clear. Hot. Highs in the upper 90s. Lows in the upper 70s. Heat index values up to 110.
Sunday Night... Partly cloudy. A slight chance of showers after midnight. Lows in the mid 70s. Chance of rain 20%. Heat index values up to 100 early in the evening.
Monday... Mostly sunny. A slight chance of showers and thunderstorms in the morning. Highs in the upper 80s. Chance of rain 20%.
Monday Night... Partly cloudy. Lows around 70. Highs in the upper 80s.
POP = Probability of Precipitation
St. Louis Regional Radar Loop
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