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, 01-Feb-2026 05:00 am

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

High: 28°	Low: 16°	High: 46°	Low: 27°	High: 41°	Low: 19°	High: 40°	Low: 22°
WCh: -2°
SSW 4 mph	S→WSW 4 mph	WSW→WNW 2-27 mph	E 2 mph	NE 6-23 mph	N 3-20 mph	NNW 3-23 mph	SW 1-17 mph

Today	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. High 28°. Wind chill ranging from -2 to 23. Wind south-southwest around 4 mph.
Tonight	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 16°. Wind south around 4 mph in the evening, becoming west-southwest after midnight.
Monday	Partly cloudy. High 46°. Wind west-southwest around 2 mph, gusting to 27 mph, in the morning, becoming west-northwest in the afternoon.
Monday night	Mostly cloudy in the evening, becoming cloudy after midnight. Low 27°. Wind east around 2 mph.
Tuesday	Cloudy in the morning, becoming partly cloudy in the afternoon. High 41°. Wind northeast around 6 mph, gusting to 23 mph.
Tuesday night	Fair in the evening, becoming clear after midnight. Low 19°. Wind north around 3 mph, gusting to 20 mph.
Wednesday	Sunny. High 40°. Wind north-northwest around 3 mph, gusting to 23 mph.
Wednesday night	Mostly clear in the evening, becoming partly cloudy after midnight. Low 22°. Wind southwest around 1 mph, gusting to 17 mph.
Thursday	Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. High 43°. Wind southwest around 4 mph, gusting to 22 mph.
Thursday night	Fair. Low 28°. Wind chill ranging from 21 to 38. Wind southwest around 6 mph, gusting to 17 mph.
Friday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Relatively mild. High 52°. Wind west-northwest around 10 mph, gusting to 28 mph.
Friday night	Partly cloudy in the evening, becoming clear after midnight. Low 22°. Wind north around 8 mph, gusting to 26 mph.
Saturday	Sunny. High 40°. Wind northeast around 5 mph, gusting to 25 mph, in the morning, becoming east in the afternoon.
Saturday night	Mostly cloudy in the evening, becoming cloudy after midnight. Low 28°. Wind chill ranging from 20 to 34. Wind east-southeast around 8 mph, gusting to 23 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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