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, 03-Feb-2026 04:00 pm

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

Low: 18°	High: 39°	Low: 19°	High: 45°	Low: 27°	High: 55°	Low: 23°	High: 46°
				WCh: 20°
N 4 mph	N 4-24 mph	N→SSW 1-20 mph	SSW 5-23 mph	SW→W 5-17 mph	WNW 9-27 mph	NNW 5-22 mph	NE→ESE 5-26 mph

Tonight	Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 18°. Wind north around 4 mph.
Wednesday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. High 39°. Wind north around 4 mph, gusting to 24 mph.
Wednesday night	Mostly clear in the evening, becoming fair after midnight. Low 19°. Wind north around 1 mph, gusting to 20 mph, in the evening, becoming south-southwest after midnight.
Thursday	Mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 45°. Wind south-southwest around 5 mph, gusting to 23 mph.
Thursday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 27°. Wind chill ranging from 20 to 40. Wind southwest around 5 mph, gusting to 17 mph, in the evening, becoming west after midnight.
Friday	Sunny. Relatively mild. High 55°. Wind west-northwest around 9 mph, gusting to 27 mph.
Friday night	Clear. Low 23°. Wind north-northwest around 5 mph, gusting to 22 mph.
Saturday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 46°. Wind northeast around 5 mph, gusting to 26 mph, in the morning, becoming east-southeast in the afternoon.
Saturday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 22°. Wind chill ranging from 16 to 38. Wind east-southeast around 7 mph, gusting to 22 mph.
Sunday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Relatively mild. High 52°. Wind southeast around 7 mph, gusting to 30 mph, in the morning, becoming east-northeast in the afternoon.
Sunday night	Mostly clear. Low 23°. Wind north-northeast around 2 mph, gusting to 17 mph, in the evening, becoming east-northeast after midnight.
Monday	Partly to mostly cloudy. Relatively mild. High 53°. Wind southeast around 2 mph in the morning, becoming 6 mph, gusting to 22 mph, in the afternoon.
Monday night	Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain after midnight. Low 31°. Wind southeast around 6 mph, gusting to 18 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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