Weather Forecast for
Zip Code 63366 O Fallon, MO


Tonight: Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 51. South wind around 5 mph becoming calm in the evening.

Christmas Day: Areas of fog before 11am. Otherwise, mostly cloudy, with a high near 66. Calm wind becoming east around 6 mph in the afternoon.

Thursday Night: Mostly cloudy, with a low around 56. East wind around 6 mph becoming southwest after midnight.

Friday: Sunny, with a high near 70. West wind 5 to 10 mph becoming light and variable in the afternoon.

Friday Night: Partly cloudy, with a low around 46. Calm wind.

Saturday: Partly sunny, with a high near 67.

Saturday Night: Mostly cloudy, with a low around 53.

Sunday: A chance of rain and thunderstorms. Mostly cloudy, with a high near 59. Chance of precipitation is 50%.

Sunday Night: A slight chance of rain and snow before midnight. Mostly cloudy, with a low around 19. Chance of precipitation is 20%.

Monday: Mostly sunny, with a high near 29.

Monday Night: Mostly clear, with a low around 18.

Tuesday: Mostly sunny, with a high near 36.

Tuesday Night: Mostly clear, with a low around 24.

Wednesday: Mostly sunny, with a high near 41.

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