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, 22-Feb-2026 04:00 pm

Tonight Mostly Clear	Monday Sunny	Monday night Partly Cloudy	Tuesday Mostly Cloudy	Tuesday night Mostly Cloudy	Wednesday Mostly Cloudy	Wednesday night Rain likely	Thursday Fog a.m.
						<.25 in.	<.1 in.
Low: 14°	High: 34°	Low: 17°	High: 49°	Low: 25°	High: 54°	Low: 40°	High: 50°
WCh: 3°		WCh: 10°
NW 11-29 mph	NW 8-26 mph	NW→S 2-19 mph	S 9-19→12-22 mph	WSW→WNW 7-18 mph	NNW→SSE 2-19 mph	SE 6-17 mph	NNW 8-25 mph

Tonight	Clear in the evening, becoming mostly clear after midnight. Breezy and cold. Low 14°. Wind chill ranging from 3 to 18. Wind northwest around 11 mph, gusting to 29 mph.
Monday	Sunny. High 34°. Wind northwest around 8 mph, gusting to 26 mph.
Monday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Cold. Low 17°. Wind chill ranging from 10 to 29. Wind northwest around 2 mph, gusting to 19 mph, in the evening, becoming south after midnight.
Tuesday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. High 49°. Wind south around 9 mph, gusting to 19 mph, in the morning, becoming 12 mph, gusting to 22 mph, in the afternoon.
Tuesday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 25°. Wind west-southwest around 7 mph, gusting to 18 mph, in the evening, becoming west-northwest after midnight.
Wednesday	Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Relatively mild. High 54°. Wind north-northwest around 2 mph, gusting to 19 mph, in the morning, becoming south-southeast in the afternoon.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then rain likely after midnight. Low 40°. Wind southeast around 6 mph, gusting to 17 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Thursday	Cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. High 50°. Wind north-northwest around 8 mph, gusting to 25 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Clear. Low 28°. Wind north-northwest around 3 mph, gusting to 20 mph, in the evening, becoming west-southwest after midnight.
Friday	Sunny. Mild. High 61°. Wind southwest around 5 mph, gusting to 18 mph, in the morning, becoming 10 mph, gusting to 23 mph, in the afternoon.
Friday night	Clear. Low 31°. Wind southwest around 7 mph, gusting to 16 mph.
Saturday	Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Unusually mild. High 68°. Wind south-southwest around 5 mph, gusting to 17 mph, in the morning, becoming 10 mph, gusting to 25 mph, in the afternoon.
Saturday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 39°. Wind south around 8 mph, gusting to 20 mph.

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