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: Tuesday, 09-Dec-2025 05:00 am

Today Partly Cloudy	Tonight Mostly Cloudy	Wednesday Partly Cloudy	Wednesday night Mostly Cloudy	Thursday Mostly Cloudy	Thursday night Mostly Cloudy	Friday Mostly Cloudy	Friday night Partly Cloudy

High: 54°	Low: 39°	High: 45°	Low: 28°	High: 40°	Low: 31°	High: 47°	Low: 23°

SW 9-24 mph	SW 14-20 mph	WNW 15-33 mph	NW 8-26→5-20 mph	W→SSE 3-20 mph	SE 5-19 mph	WNW 4-15→8-25 mph	NNW 6-23 mph

Today	Partly cloudy. Relatively mild. High 54°. Wind southwest around 9 mph, gusting to 24 mph.
Tonight	Mostly cloudy to cloudy. Breezy. Low 39°. Wind southwest around 14 mph, gusting to 20 mph.
Wednesday	Partly cloudy. Breezy. High 45°. Wind west-northwest around 15 mph, gusting to 33 mph.
Wednesday night	Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 28°. Wind northwest around 8 mph, gusting to 26 mph, in the evening, becoming 5 mph, gusting to 20 mph, after midnight.
Thursday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. High 40°. Wind west around 3 mph, gusting to 20 mph, in the morning, becoming south-southeast in the afternoon.
Thursday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 31°. Wind southeast around 5 mph, gusting to 19 mph.
Friday	Partly to mostly cloudy. High 47°. Wind west-northwest around 4 mph, gusting to 15 mph, in the morning, becoming 8 mph, gusting to 25 mph, in the afternoon.
Friday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. Low 23°. Wind north-northwest around 6 mph, gusting to 23 mph.
Saturday	Partly cloudy in the morning, becoming cloudy in the afternoon. High 37°. Wind east-northeast around 4 mph, gusting to 28 mph.
Saturday night	Mostly cloudy. Cold. Low 15°. Wind chill ranging from 6 to 26. Wind north around 10 mph, gusting to 26 mph.
Sunday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Cold. High 25°. Wind chill ranging from 4 to 16. Wind north around 8 mph, gusting to 25 mph.
Sunday night	Clear. Cold. Low 16°. Wind chill ranging from 8 to 15. Wind northeast around 6 mph, gusting to 21 mph, in the evening, becoming east-southeast after midnight.
Monday	Partly cloudy in the morning, becoming sunny in the afternoon. High 40°. Wind south-southeast around 8 mph, gusting to 24 mph.
Monday night	Mostly cloudy in the evening, becoming cloudy after midnight. Low 30°. Wind chill ranging from 24 to 32. Wind south around 6 mph, gusting to 18 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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