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: Thursday, 15-Jan-2026 05:00 am

Today Mostly Sunny	Tonight Snow	Friday Partly Cloudy	Friday night Rain and Snow	Saturday Partly Cloudy	Saturday night Mostly Clear	Sunday Mostly Cloudy	Sunday night Fair
	<.1 in.		<.1 in.
High: 37°	Low: 27°	High: 46°	Low: 27°	High: 31°	Low: 16°	High: 36°	Low: 18°
	WCh: 20°		WCh: 21°		WCh: 8°	WCh: 8°	WCh: 9°
NW→WSW 5-22 mph	SSW 6-16 mph	W 8-24→12-28 mph	W 10-26 mph	W 11-28 mph	WNW 7-25 mph	WSW 8-27 mph	W→NW 9-22 mph

Today	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 37°. Wind northwest around 5 mph, gusting to 22 mph, in the morning, becoming west-southwest in the afternoon.
Tonight	Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. A slight chance of snow. Low 27°. Wind chill ranging from 20 to 30. Wind south-southwest around 6 mph, gusting to 16 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.
Friday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. High 46°. Wind west around 8 mph, gusting to 24 mph, in the morning, becoming 12 mph, gusting to 28 mph, in the afternoon.
Friday night	Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. A slight chance of a mix of snow and rain in the evening, then a slight chance of snow after midnight. Low 27°. Wind chill ranging from 21 to 36. Wind west around 10 mph, gusting to 26 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.
Saturday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 31°. Wind chill around 19. Wind west around 11 mph, gusting to 28 mph.
Saturday night	Fair in the evening, becoming mostly clear after midnight. Low 16°. Wind chill ranging from 8 to 20. Wind west-northwest around 7 mph, gusting to 25 mph.
Sunday	Sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 36°. Wind chill ranging from 8 to 28. Wind west-southwest around 8 mph, gusting to 27 mph.
Sunday night	Fair. Low 18°. Wind chill ranging from 9 to 28. Wind west around 9 mph, gusting to 22 mph, in the evening, becoming northwest after midnight.
Monday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Cold. High 23°. Wind chill ranging from 7 to 12. Wind north-northwest around 10 mph, gusting to 28 mph.
Monday night	Clear. Cold. Low 12°. Wind north-northwest around 5 mph, gusting to 23 mph.
Tuesday	Sunny. High 34°. Wind chill ranging from 6 to 27. Wind west-southwest around 6 mph, gusting to 24 mph.
Tuesday night	Clear in the evening, becoming mostly clear after midnight. Breezy. Low 22°. Wind chill ranging from 10 to 25. Wind south around 9 mph, gusting to 20 mph, in the evening, becoming 13 mph, gusting to 18 mph, after midnight.
Wednesday	Sunny. Relatively mild. High 47°. Wind southwest around 9 mph, gusting to 24 mph, in the morning, becoming west-northwest in the afternoon.
Wednesday night	Fair. Low 20°. Wind north around 4 mph, gusting to 20 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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