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, 12-Dec-2025 04:00 pm

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

Low: 22°	High: 25°	Low: 9°	High: 24°	Low: 12°	High: 41°	Low: 21°	High: 51°
	WCh: 12°	WCh: -2°		WCh: 3°
NW 3-16 mph	N 6-23 mph	N 9-24 mph	N 9-23→4-23 mph	ESE→SSE 4 mph	SSW 9-25 mph	SW 5 mph	SW 5-19 mph

Tonight	Cloudy. Low 22°. Wind northwest around 3 mph, gusting to 16 mph.
Saturday	Cloudy in the morning, becoming dense overcast in the afternoon. Cold. High 25°. Wind chill ranging from 12 to 17. Wind north around 6 mph, gusting to 23 mph.
Saturday night	Mostly cloudy in the evening, becoming clear after midnight. Cold. Low 9°. Wind chill ranging from -2 to 12. Wind north around 9 mph, gusting to 24 mph.
Sunday	Sunny. Cold. High 24°. Wind north around 9 mph, gusting to 23 mph, in the morning, becoming 4 mph, gusting to 23 mph, in the afternoon.
Sunday night	Clear. Cold. Low 12°. Wind chill ranging from 3 to 18. Wind east-southeast around 4 mph in the evening, becoming south-southeast after midnight.
Monday	Sunny in the morning, becoming partly cloudy in the afternoon. High 41°. Wind south-southwest around 9 mph, gusting to 25 mph.
Monday night	Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 21°. Wind southwest around 5 mph.
Tuesday	Sunny in the morning, becoming partly cloudy in the afternoon. Relatively mild. High 51°. Wind southwest around 5 mph, gusting to 19 mph.
Tuesday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 29°. Wind southwest around 6 mph.
Wednesday	Partly cloudy. Relatively mild. High 58°. Wind south-southwest around 5 mph, gusting to 19 mph.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. A slight chance of rain after midnight. Breezy and relatively mild. Low 44°, but temperatures rising after midnight. Wind south around 11 mph, gusting to 18 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Sunny. Unusually mild. High 60°. Wind west around 8 mph, gusting to 16 mph, in the morning, becoming north-northwest around 5 mph, gusting to 22 mph, in the afternoon.
Thursday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 35°. Wind north-northeast around 3 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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