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 04:00 pm

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

Low: 38°	High: 40°	Low: 25°	High: 38°	Low: 31°	High: 41°	Low: 25°	High: 38°

SW 14-25 mph	WNW 16-33 mph	WNW 8-26 mph	NW→S 3-20 mph	SE→SW 7-19 mph	WNW 10-28 mph	WNW→NNW 7-24→3-21 mph	NE 3-29 mph

Tonight	Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Breezy. Low 38°. Wind southwest around 14 mph, gusting to 25 mph.
Wednesday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Windy. High 40°. Wind west-northwest around 16 mph, gusting to 33 mph.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Low 25°. Wind west-northwest around 8 mph, gusting to 26 mph.
Thursday	Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. High 38°. Wind northwest around 3 mph, gusting to 20 mph, in the morning, becoming south in the afternoon.
Thursday night	Cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 31°. Wind southeast around 7 mph, gusting to 19 mph, in the evening, becoming southwest after midnight.
Friday	Partly cloudy in the morning, becoming cloudy in the afternoon. High 41°. Wind west-northwest around 10 mph, gusting to 28 mph.
Friday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 25°. Wind west-northwest around 7 mph, gusting to 24 mph, in the evening, becoming north-northwest around 3 mph, gusting to 21 mph, after midnight.
Saturday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. High 38°. Wind northeast around 3 mph, gusting to 29 mph.
Saturday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Cold. Low 17°. Wind chill ranging from 9 to 29. Wind north around 8 mph, gusting to 23 mph.
Sunday	Sunny. High 30°. Wind chill ranging from 8 to 24. Wind north around 6 mph, gusting to 24 mph.
Sunday night	Clear. Low 17°. Wind chill ranging from 11 to 22. Wind northeast around 4 mph, gusting to 17 mph, in the evening, becoming east-southeast after midnight.
Monday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. High 39°. Wind south-southeast around 7 mph, gusting to 24 mph.
Monday night	Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 28°. Wind chill ranging from 23 to 30. Wind south-southeast around 6 mph, gusting to 19 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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