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, 29-Jan-2026 04:00 pm

Tonight Partly Cloudy	Friday Partly Cloudy	Friday night Snow Cold!	Saturday Mostly Cloudy Cold!	Saturday night Mostly Clear	Sunday Mostly Cloudy	Sunday night Partly Cloudy	Monday Partly Cloudy
		<.1 in. .5 in.
Low: 10°	High: 25°	Low: 7°	High: 24°	Low: 5°	High: 35°	Low: 19°	High: 45°
	WCh: 5°	WCh: -3°	WCh: -5°
NE 4-18 mph	NNE 5-24 mph	NNE 8-24 mph	NW 7-24 mph	NW→W 3-19 mph	SSW 4-21 mph	SW 4-19 mph	WNW 4-23 mph

Tonight	Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Cold. Low 10°. Wind northeast around 4 mph, gusting to 18 mph.
Friday	Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Cold. High 25°. Wind chill ranging from 5 to 17. Wind north-northeast around 5 mph, gusting to 24 mph.
Friday night	Cloudy in the evening, becoming mostly cloudy after midnight. A chance of snow. Cold. Low 7°. Wind chill ranging from -3 to 13. Wind north-northeast around 8 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch.
Saturday	Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Cold. High 24°. Wind chill ranging from -5 to 16. Wind northwest around 7 mph, gusting to 24 mph.
Saturday night	Clear in the evening, becoming mostly clear after midnight. Cold. Low 5°. Wind northwest around 3 mph, gusting to 19 mph, in the evening, becoming west after midnight.
Sunday	Mostly sunny in the morning, becoming mostly cloudy to cloudy in the afternoon. High 35°. Wind south-southwest around 4 mph, gusting to 21 mph.
Sunday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 19°. Wind southwest around 4 mph, gusting to 19 mph.
Monday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 45°. Wind west-northwest around 4 mph, gusting to 23 mph.
Monday night	Partly to mostly cloudy. Low 25°. Wind east around 3 mph, gusting to 18 mph.
Tuesday	Cloudy. A slight chance of snow in the afternoon. High 37°. Wind chill ranging from 21 to 30. Wind east around 6 mph, gusting to 20 mph, in the morning, becoming northeast in the afternoon. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.
Tuesday night	Dense overcast in the evening, becoming cloudy after midnight. A chance of snow. Low 24°. Wind north-northeast around 4 mph, gusting to 16 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow accumulation about an inch.
Wednesday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. A slight chance of snow. High 36°. Wind chill ranging from 15 to 28. Wind west-northwest around 9 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected.
Wednesday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of snow. Low 27°. Wind chill ranging from 20 to 27. Wind west-northwest around 9 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.

WXSIM forecast formatting script by Saratoga-Weather.org.

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