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: Tuesday, 26-May-2026 04:00 pm

Tonight Thunder storm	Wednesday Fog a.m.	Wednesday night Fog late	Thursday Fog a.m.	Thursday night Mostly Cloudy	Friday Mostly Cloudy	Friday night Mostly Cloudy	Saturday Partly Cloudy
<.1 in.	<.1 in.	<.1 in.			<.1 in.
Low: 66°	High: 81°	Low: 62°	High: 83°	Low: 61°	High: 78°	Low: 62°	High: 83°

ENE 3-20 mph	NNE 4-22 mph	NE 2-18 mph	NE 7-24 mph	NE 6-21 mph	E 7-24 mph	E 4-22 mph	ENE 6-25 mph
	UV: 7 High		UV: 8 Very High		UV: 5 Medium		UV: 7 High

Tonight	Partly to mostly cloudy. Patchy light fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 66°. Wind east-northeast around 3 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday	Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Precipitation showery or intermittent. High 81°. UV index up to 7. Wind north-northeast around 4 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain. Low 62°. Wind northeast around 2 mph, gusting to 18 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. High 83°. UV index up to 8. Wind northeast around 7 mph, gusting to 24 mph.
Thursday night	Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 61°. Wind northeast around 6 mph, gusting to 21 mph.
Friday	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain. Precipitation showery or intermittent. High 78°. UV index up to 5. Wind east around 7 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Partly to mostly cloudy. Low 62°. Wind east around 4 mph, gusting to 22 mph.
Saturday	Partly cloudy. High 83°. UV index up to 7. Wind east-northeast around 6 mph, gusting to 25 mph.
Saturday night	Partly cloudy. Low 59°. Wind east-northeast around 5 mph, gusting to 22 mph.
Sunday	Partly cloudy. High 81°. UV index up to 7. Wind east-northeast around 7 mph, gusting to 25 mph.
Sunday night	Partly cloudy. Relatively cool. Low 57°. Wind east-northeast around 4 mph, gusting to 23 mph.
Monday	Mostly sunny in the morning, becoming sunny in the afternoon. High 79°. UV index up to 10. Wind east-northeast around 6 mph, gusting to 25 mph.
Monday night	Clear. Relatively cool. Low 55°. Wind east-northeast around 4 mph, gusting to 22 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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