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: Wednesday, 18-Feb-2026 05:00 am

Today Sunny	Tonight Partly Cloudy	Thursday Thunder storm	Thursday night Fog	Friday Fog a.m.	Friday night Partly Cloudy	Saturday Mostly Sunny	Saturday night Clear
		<.1 in.
High: 76°	Low: 45°	High: 72°	Low: 37°	High: 49°	Low: 29°	High: 48°	Low: 25°
							WCh: 19°
SW 8-27 mph	S 2-18 mph	S 6-24 mph	SW 9-23→13-27 mph	WSW 11-29 mph	NW 4-22 mph	NNW 7-26 mph	NNW 8-24 mph

Today	Sunny. Exceptionally warm. High 76°. Wind southwest around 8 mph, gusting to 27 mph.
Tonight	Partly cloudy. Relatively mild. Low 45°. Wind south around 2 mph, gusting to 18 mph.
Thursday	Partly cloudy. A slight chance of rain. Scattered thundershowers possible. Unusually warm. High 72°. Wind south around 6 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Fair in the evening, becoming mostly clear after midnight. Patchy light fog. Low 37°. Wind southwest around 9 mph, gusting to 23 mph, in the evening, becoming 13 mph, gusting to 27 mph, after midnight.
Friday	Sunny in the morning, becoming mostly sunny in the afternoon. Light to moderate fog in the morning. High 49°. Wind west-southwest around 11 mph, gusting to 29 mph.
Friday night	Partly cloudy. Low 29°. Wind northwest around 4 mph, gusting to 22 mph.
Saturday	Mostly sunny in the morning, becoming sunny in the afternoon. High 48°. Wind north-northwest around 7 mph, gusting to 26 mph.
Saturday night	Fair in the evening, becoming clear after midnight. Low 25°. Wind chill ranging from 19 to 41. Wind north-northwest around 8 mph, gusting to 24 mph.
Sunday	Sunny in the morning, becoming mostly sunny in the afternoon. Breezy. High 37°. Wind chill ranging from 15 to 27. Wind northwest around 10 mph, gusting to 29 mph, in the morning, becoming 14 mph, gusting to 30 mph, in the afternoon.
Sunday night	Clear in the evening, becoming mostly clear after midnight. Cold. Low 21°. Wind chill ranging from 13 to 27. Wind northwest around 10 mph, gusting to 26 mph.
Monday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 40°. Wind northwest around 8 mph, gusting to 27 mph.
Monday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 25°. Wind north around 2 mph, gusting to 23 mph, in the evening, becoming south after midnight.
Tuesday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. High 52°. Wind south around 7 mph, gusting to 22 mph, in the morning, becoming 13 mph, gusting to 29 mph, in the afternoon.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Breezy. Low 39°. Wind south around 13 mph, gusting to 28 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

Powered by Davis Vantage Pro2 and CumulusMX v 4.6.4 (b4128) MXUI Template v 2.2.6 by Silver Acorn Valid HTML5