Weather Forecast for
O Fallon, MO


Overnight: Widespread dense fog, mainly after 5am. Otherwise, mostly cloudy, with a steady temperature around 56. Light northwest wind.

Christmas Day: Widespread dense fog, mainly before 10am. Otherwise, mostly cloudy, with a high near 67. Calm wind becoming east around 5 mph in the afternoon.

Thursday Night: Mostly cloudy, with a low around 56. East wind 5 to 7 mph becoming southwest after midnight.

Friday: Mostly sunny, with a high near 69. West wind 5 to 10 mph becoming light and variable in the afternoon.

Friday Night: Partly cloudy, with a low around 45. Light and variable wind.

Saturday: Mostly cloudy, with a high near 68.

Saturday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 56.

Sunday: Rain likely, with thunderstorms also possible after noon. Cloudy, with a high near 66. Chance of precipitation is 70%.

Sunday Night: A chance of rain and snow before midnight. Mostly cloudy, with a low around 18. Blustery. Chance of precipitation is 30%.

Monday: Sunny, with a high near 28.

Monday Night: Mostly clear, with a low around 16.

Tuesday: Sunny, with a high near 36.

Tuesday Night: Mostly clear, with a low around 23.

Wednesday: Partly sunny, with a high near 43.

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