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: Sunday, 08-Feb-2026 05:00 am

Today Partly Cloudy	Tonight Clear	Monday Mostly Sunny	Monday night Clear	Tuesday Sunny	Tuesday night Partly Cloudy	Wednesday Mostly Sunny	Wednesday night Partly Cloudy

High: 53°	Low: 23°	High: 61°	Low: 33°	High: 63°	Low: 32°	High: 57°	Low: 28°

SE 8-24 mph	SE 4-20 mph	SSE 2-16 mph	SSW 6 mph	NNW 6-25 mph	N 4-19 mph	N 4-22 mph	NE 2-17 mph

Today	Partly cloudy. Relatively mild. High 53°. Wind southeast around 8 mph, gusting to 24 mph.
Tonight	Clear. Low 23°. Wind southeast around 4 mph, gusting to 20 mph.
Monday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Unusually mild. High 61°. Wind south-southeast around 2 mph, gusting to 16 mph.
Monday night	Clear. Low 33°. Wind south-southwest around 6 mph.
Tuesday	Sunny. Unusually mild. High 63°. Wind north-northwest around 6 mph, gusting to 25 mph.
Tuesday night	Partly cloudy. Low 32°. Wind north around 4 mph, gusting to 19 mph.
Wednesday	Mostly sunny. Relatively mild. High 57°. Wind north around 4 mph, gusting to 22 mph.
Wednesday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 28°. Wind northeast around 2 mph, gusting to 17 mph.
Thursday	Mostly cloudy in the morning, becoming cloudy in the afternoon. A chance of rain in the afternoon. High 45°. Wind east-southeast around 5 mph, gusting to 18 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Cloudy in the evening, becoming dense overcast after midnight. A slight chance of a mix of rain and sleet in the evening, then a chance of a mix of rain and snow after midnight. Low 34°. Wind east-southeast around 6 mph, gusting to 15 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow or ice (on ground) accumulation expected.
Friday	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. A chance of a mix of rain and snow in the morning, then a slight chance of rain in the afternoon. High 43°. Wind east-southeast around 5 mph, gusting to 19 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected.
Friday night	Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A chance of rain. Low 33°. Wind east-southeast around 6 mph, gusting to 18 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Saturday	Dense overcast. Patchy light fog. Rain likely. High 39°. Wind chill around 30. Wind east-southeast around 7 mph in the morning, becoming north-northeast in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around an inch.
Saturday night	Dense overcast in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of a mix of rain and snow. Low 31°. Wind chill ranging from 23 to 28. Wind north around 10 mph, gusting to 17 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected.

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