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Justamir Association Lake, IL 7-Day Night Weather Forecast
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Justamir Association Lake, IL Weather Forecast
Justamir Association Lake, IL Weather Forecast Date: 849 PM CDT Mon Aug 10 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. South winds 5 to 10 mph. Heat index values up to 105 early this evening.
Tuesday... Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 110.
Tuesday Night... Partly cloudy. Lows in the upper 70s. Southwest winds around 5 mph. Heat index values up to 111 early in the evening.
Wednesday... Mostly sunny with a slight chance of showers and thunderstorms. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Chance of rain 20%. Heat index values up to 106.
Wednesday Night... Partly cloudy. A slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 20%. Heat index values up to 104 early in the evening.
Thursday... Mostly sunny with a slight chance of showers and thunderstorms. Highs in the lower 90s. Chance of rain 20%. Heat index values up to 110.
Thursday 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 mid 70s. Chance of rain 50%. Heat index values up to 105 early in the evening.
Friday... Partly sunny. Highs in the lower 90s. Heat index values up to 105 in the afternoon.
Friday Night... Partly cloudy. Lows in the mid 70s. Heat index values up to 105 early in the evening.
Saturday... Mostly clear. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105.
Saturday Night... Mostly clear. Hot. Highs in the mid 90s. Lows in the mid 70s. Heat index values up to 105.
Sunday... Mostly sunny. Highs in the mid 90s. Heat index values up to 105.
Sunday 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 lower 70s. Chance of rain 30%. Heat index values up to 100 early in the evening.
POP = Probability of Precipitation
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