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: Friday, 20-Feb-2026 05:00 am

Today Mostly Sunny	Tonight Partly Cloudy	Saturday Mostly Cloudy	Saturday night Partly Cloudy	Sunday Sunny	Sunday night Mostly Clear	Monday Sunny	Monday night Partly Cloudy

High: 46°	Low: 28°	High: 45°	Low: 24°	High: 33°	Low: 17°	High: 37°	Low: 21°
			WCh: 16°	WCh: 13°	WCh: 7°
W 14-30→11-30 mph	W→NNW 4-22 mph	NNW 6-25 mph	NNW 9-26 mph	NNW 13-31 mph	NW 11-28 mph	NW 8-26 mph	NW→S 2-20 mph

Today	Partly to mostly sunny. Breezy. High 46°. Wind west around 14 mph, gusting to 30 mph, in the morning, becoming 11 mph, gusting to 30 mph, in the afternoon.
Tonight	Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Low 28°. Wind west around 4 mph, gusting to 22 mph, in the evening, becoming north-northwest after midnight.
Saturday	Partly to mostly cloudy in the morning, becoming mostly sunny in the afternoon. High 45°. Wind north-northwest around 6 mph, gusting to 25 mph.
Saturday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 24°. Wind chill ranging from 16 to 39. Wind north-northwest around 9 mph, gusting to 26 mph.
Sunday	Sunny. Breezy and cold. High 33°. Wind chill ranging from 13 to 23. Wind north-northwest around 13 mph, gusting to 31 mph.
Sunday night	Clear in the evening, becoming mostly clear after midnight. Cold. Low 17°. Wind chill ranging from 7 to 22. Wind northwest around 11 mph, gusting to 28 mph.
Monday	Sunny. High 37°. Wind northwest around 8 mph, gusting to 26 mph.
Monday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 21°. Wind northwest around 2 mph, gusting to 20 mph, in the evening, becoming south after midnight.
Tuesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 51°. Wind south around 7 mph, gusting to 20 mph, in the morning, becoming 10 mph, gusting to 24 mph, in the afternoon.
Tuesday night	Partly to mostly cloudy. Low 29°. Wind south around 7 mph, gusting to 17 mph.
Wednesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually mild. High 65°. Wind south-southwest around 7 mph, gusting to 19 mph, in the morning, becoming 11 mph, gusting to 26 mph, in the afternoon.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Low 32°. Wind west-northwest around 8 mph, gusting to 23 mph, in the evening, becoming north-northwest after midnight.
Thursday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Relatively mild. High 52°. UV index up to 4. Wind north-northwest around 5 mph, gusting to 24 mph.
Thursday night	Clear. Low 28°. Wind chill ranging from 23 to 50. Wind south-southeast around 3 mph in the evening, becoming 6 mph after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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