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City of O'Fallon, MOO'Fallon, MO 7-Day Night Weather Forecast
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O'Fallon, MO Weather Forecast
O'Fallon, MO Weather Forecast Date: 444 PM CDT Wed Oct 28 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 mid 50s. South winds 5 to 10 mph.
Thursday... Sunny. Highs in the lower 80s. Southwest winds around 5 mph.
Thursday Night... Partly cloudy in the evening, then becoming mostly cloudy. Lows in the mid 50s. Northeast winds around 5 mph.
Friday... Partly sunny. Highs in the upper 70s. Southeast winds around 5 mph.
Friday Night... Mostly cloudy. Lows in the upper 50s. Southeast winds around 5 mph.
Saturday... Mostly cloudy. Highs in the mid 70s.
Saturday Night... Mostly cloudy with a 20% chance of showers. Lows in the mid 50s.
Sunday... Mostly cloudy. A chance of showers, mainly in the morning. Highs in the lower 70s. Chance of rain 30%.
Sunday Night... Mostly cloudy with a 20% chance of showers. Lows in the mid 50s.
Monday... Mostly cloudy with a 40% chance of showers. Highs in the lower 70s.
Monday Night... Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the upper 50s. Highs in the lower 70s. Chance of rain 50%.
Tuesday... Mostly cloudy with a chance of showers with a slight chance of thunderstorms. Lows in the upper 50s. Highs in the lower 70s. Chance of rain 50%.
POP = Probability of Precipitation
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