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: Thursday, 11-Dec-2025 05:00 am

Today Mostly Cloudy	Tonight Partly Cloudy	Friday Partly Cloudy	Friday night Mostly Cloudy	Saturday Snow	Saturday night Mostly Cloudy	Sunday Sunny	Sunday night Clear
				<.1 in.
High: 38°	Low: 27°	High: 40°	Low: 27°	High: 33°	Low: 12°	High: 25°	Low: 14°
			WCh: 21°	WCh: 20°	WCh: 3°	WCh: 1°	WCh: 5°
WSW→ESE 2-19 mph	E 5-18 mph	N 6-22 mph	NNW 4-19 mph	NNW 7-26 mph	NNW 8-26 mph	NNW 6-23 mph	E→SSE 4-17 mph

Today	Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. High 38°. Wind west-southwest around 2 mph, gusting to 19 mph, in the morning, becoming east-southeast in the afternoon.
Tonight	Partly cloudy. Low 27°. Wind east around 5 mph, gusting to 18 mph.
Friday	Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 40°. Wind north around 6 mph, gusting to 22 mph.
Friday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Low 27°. Wind chill ranging from 21 to 33. Wind north-northwest around 4 mph, gusting to 19 mph.
Saturday	Cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of snow in the afternoon. High 33°. Wind chill ranging from 20 to 26. Wind north-northwest around 7 mph, gusting to 26 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.
Saturday night	Mostly cloudy in the evening, becoming clear after midnight. Cold. Low 12°. Wind chill ranging from 3 to 21. Wind north-northwest around 8 mph, gusting to 26 mph.
Sunday	Sunny. High 25°. Wind chill ranging from 1 to 20. Wind north-northwest around 6 mph, gusting to 23 mph.
Sunday night	Clear. Cold. Low 14°. Wind chill ranging from 5 to 18. Wind east around 4 mph, gusting to 17 mph, in the evening, becoming south-southeast after midnight.
Monday	Mostly sunny in the morning, becoming sunny in the afternoon. High 43°. Wind south-southeast around 9 mph, gusting to 27 mph, in the morning, becoming southwest in the afternoon.
Monday night	Clear. Low 21°. Wind southwest around 6 mph, gusting to 17 mph.
Tuesday	Sunny. Relatively mild. High 53°. Wind southwest around 7 mph, gusting to 23 mph.
Tuesday night	Partly cloudy in the evening, becoming cloudy after midnight. Low 34°. Wind south-southwest around 8 mph.
Wednesday	Cloudy in the morning, becoming dense overcast in the afternoon. Relatively mild. High 54°. Wind south-southwest around 9 mph, gusting to 20 mph.
Wednesday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain. Breezy and relatively mild. Low 49°. Wind south-southwest around 13 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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