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-Nov-2026 05:00 am

Today Chance rain	Tonight Rain likely	Wednesday Mostly Cloudy	Wednesday night Fog late	Thursday Fog a.m.	Thursday night Mostly Cloudy	Friday Mostly Cloudy	Friday night Fog late
.1 in.	.5 in.				<.1 in.	<.1 in.
High: 78°	Low: 66°	High: 70°	Low: 52°	High: 66°	Low: 51°	High: 59°	Low: 41°

S 13-31 mph	S→SW 10-29 mph	SW 10-28 mph	SW 6-24 mph	WSW 8-27 mph	NW 4-21 mph	NNW 6-24 mph	N 3-20 mph

Today	Cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. Breezy and unusually warm. High 78°. Wind south around 13 mph, gusting to 31 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Tonight	Dense overcast in the evening, becoming cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Unusually warm. Low 66°. Wind south around 10 mph, gusting to 29 mph, in the evening, becoming southwest after midnight. Chance of precipitation 80 percent. Precipitation mostly around half an inch.
Wednesday	Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Mild. High 70°. Wind southwest around 10 mph, gusting to 28 mph.
Wednesday night	Fair to partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Relatively mild. Low 52°. Wind southwest around 6 mph, gusting to 24 mph.
Thursday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. Mild. High 66°. Wind west-southwest around 8 mph, gusting to 27 mph.
Thursday night	Mostly cloudy in the evening, becoming cloudy after midnight. A chance of rain. Low 51°. Wind northwest around 4 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday	Mostly cloudy to cloudy in the morning, becoming partly to mostly sunny in the afternoon. A slight chance of rain. High 59°. Wind north-northwest around 6 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Fair in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 41°. Wind north around 3 mph, gusting to 20 mph.
Saturday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. High 60°. Wind west-northwest around 1 mph, gusting to 19 mph, in the morning, becoming 4 mph, gusting to 24 mph, in the afternoon.
Saturday night	Clear in the evening, becoming fair after midnight. Patchy light fog after midnight. Low 42°. Wind west-northwest around 3 mph.
Sunday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Mild. High 66°. Wind west-northwest around 4 mph, gusting to 20 mph.
Sunday night	Clear. Patchy light fog after midnight. Low 41°. Wind west around 3 mph.
Monday	Sunny. Patchy light fog in the morning. Mild. High 71°. Wind southwest around 4 mph, gusting to 17 mph, in the morning, becoming 8 mph, gusting to 24 mph, in the afternoon.
Monday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Relatively mild. Low 53°. Wind southwest around 7 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

Powered by Davis Vantage Pro2 and CumulusMX v 5.1.6 (b5016) MXUI Template v 2.2.6 by Silver Acorn Valid HTML5