High 82F. Get your 3-Day weather forecast for O'Fallon, IL. Chance of rain 80%.Considerable cloudiness with occasional rain showers. Ice? Winds light and variable.

Winds NNE at 5 to 10 mph.

Find the most current and reliable 14 day weather forecasts, storm alerts, reports and information for O'Fallon, IL, US with The Weather Network. Heavy Thunderstorms. High around 75F. Then partly cloudy.

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Winds light and variable.Variably cloudy with scattered thunderstorms. Winds SE at 5 to 10 mph.Partly cloudy skies. Rain? Easy to use weather radar at your fingertips! Winds light and variable.Clear to partly cloudy.

Get the O'Fallon, IL local hourly forecast including temperature, RealFeel, and chance of precipitation. Snow? Winds light and variable. Winds light and variable. Chance of rain 40%.Partly cloudy skies.
Chance of rain 60%.Partial cloudiness early, with scattered showers and thunderstorms later during the night. Chance of rain 60%.Clear skies. feelsLike 76°. Low 64F. Winds light and variable.Partly to mostly cloudy with a chance of thunderstorms. Winds NE at 10 to 15 mph. Winds NNE at 5 to 10 mph. Winds NNE at 10 to 15 mph. Scattered thunderstorms developing later at night. Chance of rain 40%.Mostly clear skies in the evening with isolated thunderstorms developing after midnight. Track storms, and stay in-the-know and prepared for what's coming. Check out our current live radar and weather forecasts for O'Fallon, Illinois to help plan your day Low near 65F. Winds N at 5 to 10 mph.

High 77F. High 81F. Low 59F. High 78F. Scattered thunderstorms developing later at night. High 83F. Winds light and variable.Intervals of clouds and sunshine.

Low 59F. Chance of rain 60%.Sunny along with a few clouds. Low 63F. Low 66F. 65%. Chance of rain 50%.Type at least three characters to start auto complete. Chance of rain 40%.A few clouds early, otherwise mostly sunny. Chance of rain 50%.Mostly clear skies early. High near 75F. Chance of rain 50%.

Winds light and variable. High 83F. NNE 7 mph.

Winds light and variable.A few clouds from time to time. Winds N at 5 to 10 mph. Winds light and variable.

Winds N at 5 to 10 mph.Partly cloudy skies early. Weather Underground provides local & long-range weather forecasts, weatherreports, maps & tropical weather conditions for the OFallon area. uvIndex uvIndexVal. Low 56F. Low near 65F. Chance of rain 30%.Widely scattered showers or a thunderstorm early. Chance of rain 50%.Thunderstorms likely, especially during the morning. High 79F. Winds light and variable. humidity 95%. Winds NNE at 5 to 10 mph.

Want to know what the weather is now? High 82F.

High 83F.

Low near 65F.

Low 63F. The first option will be automatically selected.

Winds N at 5 to 10 mph.Cloudy this evening with showers after midnight. Low 66F. Winds S at 5 to 10 mph. wind NW 2 mph.

Chance of rain 50%.Showers early becoming less numerous late. Use escape to clear.Scattered showers and thunderstorms. Chance of rain 30%.Scattered thunderstorms. Hi/Low, RealFeel, precip, radar, & everything you need to be ready for the day, commute, and weekend!