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Alton Park, IL 7-Day Night Weather Forecast
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Alton Park, IL Weather Forecast
Alton Park, IL Weather Forecast Date: 433 PM CDT Tue Sep 01 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... Clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 101 early this evening.
Wednesday... Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 104.
Wednesday Night... Mostly clear. Lows in the upper 70s. South winds 5 to 10 mph. Heat index values up to 102 early in the evening.
Thursday... Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 105.
Thursday Night... Mostly clear. Lows in the upper 70s. South winds around 5 mph. Heat index values up to 104 early in the evening.
Friday... Mostly clear. Hot. Highs in the upper 90s. Lows in the upper 70s. Heat index values up to 105.
Friday Night... Mostly clear. Hot. Highs in the upper 90s. Lows in the upper 70s. Heat index values up to 105.
Saturday... Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the upper 90s. Chance of rain 20%. Heat index values up to 105.
Saturday Night... Partly cloudy. Lows in the mid 70s. Heat index values up to 100 early in the evening.
Sunday... Partly cloudy. A slight chance of showers and thunderstorms. Highs in the mid 90s. Lows in the lower 70s. Chance of rain 20%. Heat index values up to 100.
Sunday Night... Partly cloudy. A slight chance of showers and thunderstorms. Highs in the mid 90s. Lows in the lower 70s. Chance of rain 20%. Heat index values up to 100.
Labor Day... Partly cloudy. Highs in the lower 90s. Lows in the upper 60s.
POP = Probability of Precipitation
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