OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CST UTC Last station update CST

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Monday, 24-Nov-2025 04:00 pm

Tonight Rain likely	Tuesday Fog a.m.	Tuesday night Partly Cloudy	Wednesday Fog a.m.	Wednesday night Mostly Cloudy	Thursday Sunny	Thursday night Clear	Friday Partly Cloudy
.5 in.
Low: 48°	High: 59°	Low: 43°	High: 50°	Low: 32°	High: 42°	Low: 25°	High: 43°

SE→S 5 mph	WSW 4-19 mph	WSW 9-25→14-30 mph	WSW 13-32 mph	WNW 8-25 mph	WNW 9-27 mph	WNW 5-19 mph	NW 3-21 mph

Tonight	Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Relatively mild. Low 48°. Wind southeast around 5 mph in the evening, becoming south after midnight. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Tuesday	Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. Mild. High 59°. Wind west-southwest around 4 mph, gusting to 19 mph.
Tuesday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Breezy. Low 43°. Wind west-southwest around 9 mph, gusting to 25 mph, in the evening, becoming 14 mph, gusting to 30 mph, after midnight.
Wednesday	Mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Breezy. High 50°. Wind west-southwest around 13 mph, gusting to 32 mph.
Wednesday night	Partly to mostly cloudy. Low 32°. Wind west-northwest around 8 mph, gusting to 25 mph.
Thursday	Sunny. High 42°. Wind west-northwest around 9 mph, gusting to 27 mph.
Thursday night	Clear. Low 25°. Wind west-northwest around 5 mph, gusting to 19 mph.
Friday	Sunny in the morning, becoming partly cloudy in the afternoon. High 43°. Wind northwest around 3 mph, gusting to 21 mph.
Friday night	Cloudy in the evening, becoming dense overcast after midnight. A slight chance of a mix of snow and rain in the evening, then a chance of snow after midnight. Low 33°. Wind southeast around 5 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow accumulation about a quarter inch.
Saturday	Dense overcast. A chance of a mix of snow, sleet, and rain in the morning, then a slight chance of a mix of rain and snow in the afternoon. High 39°. Wind chill ranging from 25 to 32. Wind south around 10 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow or ice (on ground) accumulation expected.
Saturday night	Dense overcast. A chance of rain in the evening, then rain likely after midnight. Breezy. Low 36°. Wind south around 11 mph, gusting to 23 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch.
Sunday	Dense overcast in the morning, becoming cloudy in the afternoon. Rain likely in the morning, then a slight chance of rain in the afternoon. Breezy. High 46°. Wind south around 13 mph, gusting to 23 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Sunday night	Dense overcast. A chance of rain in the evening, then rain likely after midnight. Breezy. Low 44°, but temperatures rising after midnight. Wind south around 15 mph, gusting to 22 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.

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