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O'Fallon, IL Weather Forecast
O'Fallon, IL Weather Forecast Date: 1224 PM CST Mon Nov 02 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... Mostly cloudy. Near steady temperature in the mid 60s. South winds 10 to 15 mph with gusts up to 25 mph.
Tonight... Mostly cloudy. Near steady temperature in the lower 60s. South winds 15 to 20 mph with gusts up to 30 mph.
Tuesday... A slight chance of thunderstorms. A chance of rain in the morning, then rain in the afternoon. Breezy with highs in the mid 70s. Temperature falling to around 70 in the afternoon. South winds 15 to 25 mph with gusts up to 35 mph. Chance of rain near 100%.
Tuesday Night... Rain with a slight chance of thunderstorms in the evening, then a slight chance of rain after midnight. Lows in the lower 50s. South winds 15 to 20 mph, becoming southwest 5 to 10 mph after midnight. Chance of rain near 100%.
Wednesday... Partly sunny. Highs in the mid 60s. West winds 10 to 15 mph.
Wednesday Night... Mostly clear. Lows in the mid 40s.
Thursday... Mostly sunny. Highs in the upper 60s.
Thursday Night... Partly cloudy with a slight chance of rain in the evening, then mostly cloudy after midnight. Lows in the mid 40s. Chance of rain 20%.
Friday... Partly cloudy. Highs around 60. Lows in the upper 30s.
Friday Night... Partly cloudy. Highs around 60. Lows in the upper 30s.
Saturday... Partly sunny. Highs in the upper 50s.
Saturday Night... Partly cloudy. Lows in the upper 30s. Highs in the lower 60s.
POP = Probability of Precipitation
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