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City of Belleville, ILBelleville, IL 7-Day Night Weather Forecast
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Belleville, IL Weather Forecast
Belleville, IL Weather Forecast Date: 127 PM CDT Fri Sep 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.
This Afternoon... Cloudy with a slight chance of showers and thunderstorms. Near steady temperature in the lower 80s. Southeast winds 5 to 10 mph. Chance of rain 20%.
Tonight... Mostly cloudy with a slight chance of showers in the evening, then partly cloudy after midnight. Patchy fog after midnight. Lows in the upper 60s. South winds around 5 mph. Chance of rain 20%.
Saturday... Patchy fog in the morning. Mostly sunny. Highs around 90. West winds around 5 mph.
Saturday Night... Partly cloudy. Lows in the upper 60s. Northwest winds around 5 mph.
Sunday... Mostly sunny with a slight chance of showers. A slight chance of thunderstorms in the afternoon. Highs in the upper 80s. Northwest winds around 5 mph. Chance of rain 20%.
Sunday Night... Partly cloudy. A slight chance of showers and thunderstorms. Lows in the mid 60s. Highs in the upper 80s. Chance of rain 20%.
Monday... Partly cloudy. A slight chance of showers and thunderstorms. Lows in the mid 60s. Highs in the upper 80s. Chance of rain 20%.
Monday Night... Mostly clear. Hot. Lows around 70. Highs in the mid 90s. Heat index values up to 105.
Tuesday... Mostly clear. Hot. Lows around 70. Highs in the mid 90s. Heat index values up to 105.
Tuesday Night... Partly cloudy. A slight chance of showers and thunderstorms. Lows in the lower 70s. Highs in the lower 90s. Chance of rain 20%. Heat index values up to 100.
Wednesday... Partly cloudy. A slight chance of showers and thunderstorms. Lows in the lower 70s. Highs in the lower 90s. Chance of rain 20%. Heat index values up to 100.
Wednesday Night... Partly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers after midnight. Lows in the lower 70s. Chance of rain 40%.
POP = Probability of Precipitation
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