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 04:00 pm

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

Low: 27°	High: 44°	Low: 24°	High: 32°	Low: 16°	High: 37°	Low: 21°	High: 51°
		WCh: 15°	WCh: 12°	WCh: 6°
NW 4-21 mph	NNW 6-26 mph	NNW 9-26 mph	NW 13-31 mph	NW 11-28 mph	NW 8-26 mph	NW→SSW 2-21 mph	SSW 9-24 mph

Tonight	Mostly clear in the evening, becoming mostly cloudy after midnight. Low 27°. Wind northwest around 4 mph, gusting to 21 mph.
Saturday	Mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 44°. Wind north-northwest around 6 mph, gusting to 26 mph.
Saturday night	Clear. Low 24°. Wind chill ranging from 15 to 36. Wind north-northwest around 9 mph, gusting to 26 mph.
Sunday	Mostly sunny in the morning, becoming sunny in the afternoon. Breezy and cold. High 32°. Wind chill ranging from 12 to 22. Wind northwest around 13 mph, gusting to 31 mph.
Sunday night	Clear in the evening, becoming mostly clear after midnight. Breezy and cold. Low 16°. Wind chill ranging from 6 to 21. 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. Low 21°. Wind northwest around 2 mph, gusting to 21 mph, in the evening, becoming south-southwest after midnight.
Tuesday	Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 51°. Wind south-southwest around 9 mph, gusting to 24 mph.
Tuesday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 29°. Wind southwest around 5 mph, gusting to 18 mph.
Wednesday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Unusually mild. High 66°. Wind southeast around 2 mph, gusting to 18 mph, in the morning, becoming 6 mph, gusting to 23 mph, in the afternoon.
Wednesday night	Mostly cloudy to cloudy. A chance of rain. Low 37°. Wind south-southwest around 10 mph, gusting to 20 mph, in the evening, becoming northwest after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. High 45°. Wind west-northwest around 6 mph, gusting to 18 mph, in the morning, becoming 16 mph, gusting to 31 mph, in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch.
Thursday night	Clear. Patchy light fog after midnight. Low 29°. Wind northwest around 12 mph, gusting to 30 mph, in the evening, becoming 5 mph, gusting to 20 mph, after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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