OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CDT UTC Last station update CDT

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Friday, 03-Apr-2026 05:00 am

Today Thunder storm	Tonight Thunder storm	Saturday Thunder storm	Saturday night Partly Cloudy	Sunday Fog a.m.	Sunday night Clear	Monday Mostly Cloudy	Monday night Chance rain
<.1 in.	.75 in.	<.1 in.					<.1 in.
High: 77°	Low: 62°	High: 64°	Low: 44°	High: 59°	Low: 41°	High: 62°	Low: 39°

SSE 4-21→11-25 mph	SSW 6-21 mph	WNW 11-30 mph	WNW 8-28 mph	WNW 9-29 mph	WNW→WSW 5-22 mph	WNW 8-26 mph	NW→N 7-22 mph
		UV: 5 Medium		UV: 7 High		UV: 5 Medium

Today	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. A chance of rain. Scattered thunderstorms likely, some possibly severe. Warm. High 77°. Wind south-southeast around 4 mph, gusting to 21 mph, in the morning, becoming 11 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tonight	Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Light to moderate fog. Rain likely. Thunderstorms very likely, some possibly severe. Mild. Low 62°. Wind south-southwest around 6 mph, gusting to 21 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch.
Saturday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thunderstorms likely. High 64°. UV index up to 5. Wind west-northwest around 11 mph, gusting to 30 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Saturday night	Partly cloudy in the evening, becoming clear after midnight. Low 44°. Wind west-northwest around 8 mph, gusting to 28 mph.
Sunday	Sunny. Patchy light fog in the morning. High 59°. UV index up to 7. Wind west-northwest around 9 mph, gusting to 29 mph.
Sunday night	Clear. Low 41°. Wind west-northwest around 5 mph, gusting to 22 mph, in the evening, becoming west-southwest after midnight.
Monday	Sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 62°. UV index up to 5. Wind west-northwest around 8 mph, gusting to 26 mph.
Monday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Cold. Low 39°. Wind northwest around 7 mph, gusting to 22 mph, in the evening, becoming north after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Tuesday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. A slight chance of rain. High 57°. UV index up to 6. Wind northeast around 8 mph, gusting to 27 mph, in the morning, becoming east in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 40°. Wind southeast around 8 mph, gusting to 25 mph.
Wednesday	Partly cloudy in the morning, becoming sunny in the afternoon. Breezy and mild. High 70°. UV index up to 6. Wind south-southeast around 11 mph, gusting to 29 mph.
Wednesday night	Partly cloudy. Low 47°. Wind south-southwest around 8 mph, gusting to 24 mph.
Thursday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Warm. High 76°. UV index up to 8. Wind south-southwest around 9 mph, gusting to 27 mph.
Thursday night	Fair in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 49°. Wind south-southwest around 7 mph, gusting to 22 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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