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 04:00 pm

Tonight Thunder storm	Saturday Thunder storm	Saturday night Fog late	Sunday Fog a.m.	Sunday night Clear	Monday Mostly Cloudy	Monday night Mostly Cloudy	Tuesday Partly Cloudy
1.0 in.	.1 in.						<.1 in.
Low: 64°	High: 65°	Low: 44°	High: 58°	Low: 41°	High: 61°	Low: 41°	High: 54°

S 8-25 mph	WNW 10-29 mph	WNW 8-28 mph	WNW 9-28 mph	W 5-22 mph	WNW 8-26 mph	NW→N 7-23 mph	NE→E 8-25 mph
	UV: 5 Medium		UV: 6 High		UV: 5 Medium		UV: 5 Medium

Tonight	Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Moderate fog in the evening, then light to moderate fog after midnight. Rain very likely. Scattered thunderstorms likely. Mild. Low 64°. Wind south around 8 mph, gusting to 25 mph. Chance of precipitation 90 percent. Precipitation mostly around an inch.
Saturday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. Scattered thunderstorms likely. High 65°, but temperatures falling in the afternoon. UV index up to 5. Wind west-northwest around 10 mph, gusting to 29 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Saturday night	Mostly clear in the evening, becoming clear after midnight. Patchy light fog after midnight. Low 44°. Wind west-northwest around 8 mph, gusting to 28 mph.
Sunday	Sunny. Patchy light fog in the morning. High 58°. UV index up to 6. Wind west-northwest around 9 mph, gusting to 28 mph.
Sunday night	Clear. Low 41°. Wind west around 5 mph, gusting to 22 mph.
Monday	Sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 61°. UV index up to 5. Wind west-northwest around 8 mph, gusting to 26 mph.
Monday night	Mostly cloudy to cloudy. Low 41°. Wind northwest around 7 mph, gusting to 23 mph, in the evening, becoming north after midnight.
Tuesday	Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. A slight chance of rain. High 54°. UV index up to 5. Wind northeast around 8 mph, gusting to 25 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	Partly cloudy. Low 42°. Wind east-southeast around 8 mph, gusting to 24 mph.
Wednesday	Partly cloudy in the morning, becoming sunny in the afternoon. Mild. High 70°. UV index up to 6. Wind southeast around 10 mph, gusting to 28 mph.
Wednesday night	Mostly clear in the evening, becoming partly cloudy after midnight. Low 47°. Wind south-southeast around 9 mph, gusting to 23 mph.
Thursday	Mostly cloudy to 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. High 63°. Wind south around 10 mph, gusting to 20 mph, in the morning, becoming west-northwest around 4 mph, gusting to 17 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Thursday night	Cloudy in the evening, becoming dense overcast after midnight. Light to moderate fog in the evening, then patchy light fog after midnight. Rain likely in the evening, then a slight chance of rain after midnight. Low 48°. Wind north-northeast around 5 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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