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, 16-Dec-2025 04:00 pm

Tonight Mostly Cloudy	Wednesday Partly Cloudy	Wednesday night Mostly Cloudy	Thursday Rain likely	Thursday night Mostly Clear	Friday Mostly Sunny	Friday night Partly Cloudy	Saturday Partly Cloudy
		<.1 in.	.35 in.
Low: 33°	High: 56°	Low: 41°	High: 50°	Low: 25°	High: 43°	Low: 29°	High: 54°
				WCh: 17°		WCh: 22°
SW 7-20 mph	WSW→SE 2 mph	SSE 8-15→11-16 mph	SSW→WNW 11-27 mph	WNW 13-29 mph	WNW→SSW 7-24 mph	S 8-17 mph	SSW 8-21 mph

Tonight	Partly to mostly cloudy. Low 33°. Wind southwest around 7 mph, gusting to 20 mph.
Wednesday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Relatively mild. High 56°. Wind west-southwest around 2 mph in the morning, becoming southeast in the afternoon.
Wednesday night	Mostly cloudy in the evening, becoming cloudy after midnight. A slight chance of rain after midnight. Relatively mild. Low 41°. Wind south-southeast around 8 mph, gusting to 15 mph, in the evening, becoming 11 mph, gusting to 16 mph, after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog. Rain likely in the morning, then a slight chance of rain in the afternoon. Breezy and relatively mild. High 50°. Wind south-southwest around 11 mph, gusting to 27 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Thursday night	Mostly clear. Breezy. Low 25°. Wind chill ranging from 17 to 36. Wind west-northwest around 13 mph, gusting to 29 mph.
Friday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 43°. Wind west-northwest around 7 mph, gusting to 24 mph, in the morning, becoming south-southwest in the afternoon.
Friday night	Partly cloudy. Low 29°. Wind chill ranging from 22 to 34. Wind south around 8 mph, gusting to 17 mph.
Saturday	Partly cloudy. Relatively mild. High 54°. Wind south-southwest around 8 mph, gusting to 21 mph.
Saturday night	Partly cloudy in the evening, becoming mostly clear after midnight. Low 23°. Wind north-northwest around 6 mph.
Sunday	Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. High 43°. Wind north around 4 mph.
Sunday night	Partly cloudy. Low 25°. Wind east-northeast around 4 mph.
Monday	Mostly cloudy in the morning, becoming cloudy in the afternoon. High 42°. Wind east-southeast around 7 mph.
Monday night	Partly cloudy in the evening, becoming mostly clear after midnight. Low 23°. Wind southeast around 6 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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