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, 19-Feb-2026 05:00 am

Today Partly Cloudy	Tonight Fog late	Friday Fog a.m.	Friday night Rain and Snow	Saturday Mostly Cloudy	Saturday night Mostly Clear	Sunday Sunny	Sunday night Clear
			<.1 in.
High: 73°	Low: 37°	High: 47°	Low: 29°	High: 45°	Low: 25°	High: 36°	Low: 20°
					WCh: 17°	WCh: 14°	WCh: 12°
S 3-16→8-26 mph	WSW 10-22→14-29 mph	W 12-30 mph	NW 4-22 mph	NNW 6-25 mph	NNW 9-23 mph	NW 13-30 mph	NW 10-27 mph

Today	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Unusually warm. High 73°. Wind south around 3 mph, gusting to 16 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon.
Tonight	Fair in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Breezy. Low 37°. Wind west-southwest around 10 mph, gusting to 22 mph, in the evening, becoming 14 mph, gusting to 29 mph, after midnight.
Friday	Sunny. Patchy light fog in the morning. Breezy. High 47°. Wind west around 12 mph, gusting to 30 mph.
Friday night	Partly cloudy. A slight chance of a mix of rain and snow in the evening, then a slight chance of a mix of snow, sleet, and rain after midnight. Low 29°. Wind northwest around 4 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow or ice (on ground) accumulation expected.
Saturday	Mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 45°. Wind north-northwest around 6 mph, gusting to 25 mph.
Saturday night	Mostly clear in the evening, becoming clear after midnight. Low 25°. Wind chill ranging from 17 to 38. Wind north-northwest around 9 mph, gusting to 23 mph.
Sunday	Sunny. Breezy. High 36°. Wind chill ranging from 14 to 27. Wind northwest around 13 mph, gusting to 30 mph.
Sunday night	Clear. Cold. Low 20°. Wind chill ranging from 12 to 26. Wind northwest around 10 mph, gusting to 27 mph.
Monday	Sunny. High 40°. Wind northwest around 8 mph, gusting to 27 mph.
Monday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 23°. Wind northwest around 2 mph, gusting to 21 mph, in the evening, becoming south-southwest after midnight.
Tuesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 52°. Wind south-southwest around 7 mph, gusting to 24 mph, in the morning, becoming 12 mph, gusting to 28 mph, in the afternoon.
Tuesday night	Mostly cloudy. Breezy. Low 37°. Wind south-southwest around 12 mph, gusting to 25 mph.
Wednesday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Breezy. High 53°. Wind south-southwest around 12 mph, gusting to 24 mph, in the morning, becoming west-northwest in the afternoon.
Wednesday night	Clear. Low 27°. Wind northwest around 11 mph, gusting to 22 mph, in the evening, becoming 5 mph, gusting to 15 mph, after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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