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: Friday, 13-Feb-2026 04:00 pm

Tonight Partly Cloudy	Saturday Rain likely	Saturday night Rain likely	Sunday Fog a.m.	Sunday night Fog late	Monday Fog a.m.	Monday night Partly Cloudy	Tuesday Partly Cloudy
	.5 in.	.35 in.
Low: 40°	High: 53°	Low: 41°	High: 59°	Low: 35°	High: 67°	Low: 41°	High: 69°

SW 2-23 mph	S→ESE 4-16 mph	E→NE 7-19 mph	NNE 6-22 mph	W 4-17 mph	SSW 7-25 mph	SSW 6-18 mph	SSE 5-16→8-24 mph

Tonight	Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 40°. Wind southwest around 2 mph, gusting to 23 mph.
Saturday	Cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Relatively mild. High 53°. Wind south around 4 mph, gusting to 16 mph, in the morning, becoming east-southeast in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Saturday night	Dense overcast. Patchy light fog. Rain likely in the evening, then a chance of rain after midnight. Low 41°. Wind east around 7 mph, gusting to 19 mph, in the evening, becoming northeast after midnight. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Sunday	Partly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Mild. High 59°. Wind north-northeast around 6 mph, gusting to 22 mph.
Sunday night	Clear in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 35°. Wind west around 4 mph, gusting to 17 mph.
Monday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Unusually mild. High 67°. Wind south-southwest around 7 mph, gusting to 25 mph.
Monday night	Partly cloudy. Relatively mild. Low 41°. Wind south-southwest around 6 mph, gusting to 18 mph.
Tuesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually warm. High 69°. Wind south-southeast around 5 mph, gusting to 16 mph, in the morning, becoming 8 mph, gusting to 24 mph, in the afternoon.
Tuesday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Breezy and relatively mild. Low 51°. Wind south-southeast around 12 mph, gusting to 22 mph, in the evening, becoming southwest after midnight.
Wednesday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Unusually warm. High 73°. Wind west-southwest around 10 mph, gusting to 27 mph.
Wednesday night	Partly cloudy in the evening, becoming mostly clear after midnight. Low 38°. Wind west around 3 mph, gusting to 17 mph.
Thursday	Partly cloudy in the morning, becoming cloudy in the afternoon. A chance of rain in the afternoon. Scattered thunderstorms likely. Unusually mild. High 64°. Wind east-southeast around 5 mph, gusting to 17 mph, in the morning, becoming south-southeast around 11 mph, gusting to 22 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Cloudy in the evening, becoming fair after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Breezy and relatively mild. Low 45°. Wind southwest around 11 mph, gusting to 19 mph, in the evening, becoming 15 mph, gusting to 24 mph, after midnight. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.

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