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City of Belleville, ILBelleville, IL 7-Day Weather Forecast
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Belleville Weather Forecast
Belleville, IL Weather Forecast Date: 237 AM CDT Thu Sep 17 2026
Weather forecast for Belleville, IL
Today Hi: 99°FHi: 37°C Lo: 71°F Lo: 22°C |
Today... Sunny. A slight chance of showers and thunderstorms this afternoon. Hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Chance of rain 20%. Heat index values up to 108 this afternoon. |
| Fri Hi: 95°FHi: 35°C Lo: 71°F Lo: 22°C |
Friday... Sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. East winds around 5 mph, becoming south in the afternoon. Chance of rain 20%. Heat index values up to 105 in the afternoon. |
Sat Hi: 95°FHi: 35°C Lo: 71°F Lo: 22°C |
Saturday... Mostly sunny. Hot with highs in the mid 90s. Southwest winds 5 to 10 mph. |
| Sun Hi: 91°FHi: 33°C Lo: 69°F Lo: 21°C |
Sunday... Partly cloudy. A slight chance of showers and thunderstorms. Lows in the lower 70s. Highs in the lower 90s. Chance of rain 20%. |
| Mon Hi: 85°FHi: 29°C Lo: 61°F Lo: 16°C |
Monday... Mostly cloudy in the morning, then becoming partly sunny. A chance of showers. A chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50%. |
Tue Hi: 80°FHi: 27°C Lo: 60°F Lo: 16°C |
Tuesday... Mostly sunny. A slight chance of showers in the morning. Highs around 80. Chance of rain 20%. |
Wed Hi: 81°FHi: 27°C Lo: 60°F Lo: 16°C |
Wednesday... Partly cloudy. Lows around 60. Highs in the lower 80s. |
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