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: Saturday, 21-Feb-2026 05:00 am

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

High: 43°	Low: 22°	High: 28°	Low: 15°	High: 35°	Low: 20°	High: 53°	Low: 30°
	WCh: 14°	WCh: 10°	WCh: 3°	WCh: 3°
NNW 6-25 mph	NNW 8-24 mph	WNW 14-31 mph	WNW 12-27 mph	NW 8-27 mph	WNW→SSW 2-19 mph	SSW 7-21→12-26 mph	SW 7-20 mph

Today	Mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 43°. Wind north-northwest around 6 mph, gusting to 25 mph.
Tonight	Clear in the evening, becoming partly cloudy after midnight. Cold. Low 22°. Wind chill ranging from 14 to 36. Wind north-northwest around 8 mph, gusting to 24 mph.
Sunday	Partly cloudy. Breezy and cold. High 28°. Wind chill ranging from 10 to 17. Wind west-northwest around 14 mph, gusting to 31 mph.
Sunday night	Clear in the evening, becoming mostly clear after midnight. Breezy and cold. Low 15°. Wind chill ranging from 3 to 16. Wind west-northwest around 12 mph, gusting to 27 mph.
Monday	Sunny. High 35°. Wind chill ranging from 3 to 29. Wind northwest around 8 mph, gusting to 27 mph.
Monday night	Fair in the evening, becoming partly cloudy after midnight. Cold. Low 20°. Wind west-northwest around 2 mph, gusting to 19 mph, in the evening, becoming south-southwest after midnight.
Tuesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 53°. Wind south-southwest around 7 mph, gusting to 21 mph, in the morning, becoming 12 mph, gusting to 26 mph, in the afternoon.
Tuesday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 30°. Wind southwest around 7 mph, gusting to 20 mph.
Wednesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually mild. High 65°. Wind west around 5 mph, gusting to 23 mph, in the morning, becoming south-southwest in the afternoon.
Wednesday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 37°. Wind south-southwest around 8 mph, gusting to 22 mph, in the evening, becoming west-northwest after midnight.
Thursday	Partly to mostly cloudy in the morning, becoming sunny in the afternoon. High 52°. Wind west-northwest around 11 mph, gusting to 28 mph.
Thursday night	Clear. Low 27°. Wind northwest around 6 mph, gusting to 23 mph, in the evening, becoming near calm after midnight.
Friday	Sunny. Relatively mild. High 58°. UV index up to 4. Wind south-southwest around 4 mph, gusting to 20 mph, in the morning, becoming 7 mph, gusting to 24 mph, in the afternoon.
Friday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 31°. Wind chill ranging from 25 to 54. Wind south-southwest around 7 mph, gusting to 18 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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