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St. Clair Park, IL 7-Day Night Weather Forecast
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St. Clair Park, IL Weather Forecast
St. Clair Park, IL Weather Forecast Date: 1143 AM CDT Wed Aug 12 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.
This Afternoon... Partly sunny. Isolated showers and thunderstorms. Near steady temperature in the lower 90s. Southwest winds 5 to 10 mph. Chance of rain 20%. Heat index values up to 104.
Tonight... Mostly cloudy with isolated showers and thunderstorms in the evening, then partly cloudy with scattered showers and thunderstorms after midnight. Humid with lows in the upper 70s. South winds around 5 mph. Chance of rain 30%. Heat index values up to 104 early in the evening.
Thursday... Mostly sunny. Scattered showers and thunderstorms, mainly in the morning. Hot with highs in the mid 90s. South winds around 5 mph. Chance of rain 30%. Heat index values up to 111 in the afternoon.
Thursday Night... Partly cloudy. Isolated showers and thunderstorms in the evening. Humid with lows in the upper 70s. South winds 5 to 10 mph. Chance of rain 20%. Heat index values up to 110 early in the evening.
Friday... Mostly sunny. Hot with highs in the upper 90s. Southwest winds around 5 mph. Heat index values up to 111 in the afternoon.
Friday Night... Mostly clear. Hot. Lows in the upper 70s. Highs in the upper 90s. Heat index values up to 110.
Saturday... Mostly clear. Hot. Lows in the upper 70s. Highs in the upper 90s. Heat index values up to 110.
Sunday... Mostly clear. Hot. Lows in the upper 70s. Highs in the upper 90s. Heat index values up to 110.
Sunday Night... Mostly clear in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. Chance of rain 20%. Heat index values up to 105 early in the evening.
Monday... Mostly sunny with a slight chance of thunderstorms. A chance of showers, mainly in the morning. Highs in the upper 80s. Chance of rain 30%.
Monday Night... Partly cloudy. Lows in the upper 60s. Highs in the upper 80s.
POP = Probability of Precipitation
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