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, 10-Jan-2026 04:00 pm

Tonight Partly Cloudy	Sunday Mostly Sunny	Sunday night Partly Cloudy	Monday Partly Cloudy	Monday night Mostly Cloudy	Tuesday Mostly Cloudy	Tuesday night Partly Cloudy	Wednesday Rain and Snow
							<.1 in.
Low: 23°	High: 39°	Low: 22°	High: 56°	Low: 33°	High: 57°	Low: 37°	High: 41°
WCh: 15°		WCh: 15°
WNW 10-22 mph	NW 8-24 mph	SW 5 mph	SSW 7-22 mph	SSW 6 mph	SW 10-22 mph	WSW 8-18 mph	WNW 11-29→15-31 mph

Tonight	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 23°. Wind chill ranging from 15 to 36. Wind west-northwest around 10 mph, gusting to 22 mph.
Sunday	Partly to mostly sunny. High 39°. Wind northwest around 8 mph, gusting to 24 mph.
Sunday night	Fair to partly cloudy in the evening, becoming fair after midnight. Low 22°. Wind chill ranging from 15 to 31. Wind southwest around 5 mph.
Monday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Relatively mild. High 56°. Wind south-southwest around 7 mph, gusting to 22 mph.
Monday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 33°. Wind south-southwest around 6 mph.
Tuesday	Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Relatively mild. High 57°. Wind southwest around 10 mph, gusting to 22 mph.
Tuesday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 37°. Wind west-southwest around 8 mph, gusting to 18 mph.
Wednesday	Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain in the morning, then a slight chance of a mix of rain and snow in the afternoon. Breezy. High 41°. Wind west-northwest around 11 mph, gusting to 29 mph, in the morning, becoming 15 mph, gusting to 31 mph, in the afternoon. 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 partly cloudy after midnight. Breezy. Low 20°. Wind chill ranging from 12 to 24. Wind north-northwest around 12 mph, gusting to 30 mph.
Thursday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 38°. Wind northwest around 6 mph, gusting to 23 mph.
Thursday night	Mostly cloudy. Low 26°. Wind chill ranging from 19 to 32. Wind southwest around 4 mph, gusting to 16 mph.
Friday	Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 45°. Wind southwest around 8 mph, gusting to 26 mph.
Friday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 22°. Wind west-southwest around 4 mph, gusting to 16 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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