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 05:00 am

Today Mostly Cloudy	Tonight Fog late	Wednesday Partly Cloudy	Wednesday night Fog late	Thursday Partly Cloudy	Thursday night Fog late	Friday Fog a.m.	Friday night Partly Cloudy
				<.1 in.
High: 81°	Low: 61°	High: 85°	Low: 59°	High: 84°	Low: 59°	High: 82°	Low: 57°

ENE 4-24 mph	NE 3-20 mph	N 3-23 mph	NNE 2-19 mph	NE 5-23 mph	NE 5-16 mph	E 7-24 mph	E 4-22 mph
UV: 6 High		UV: 8 Very High		UV: 8 Very High		UV: 7 High

Today	Mostly cloudy. High 81°. UV index up to 6. Wind east-northeast around 4 mph, gusting to 24 mph.
Tonight	Partly cloudy. Patchy light fog after midnight. Low 61°. Wind northeast around 3 mph, gusting to 20 mph.
Wednesday	Partly cloudy in the morning, becoming sunny in the afternoon. Warm. High 85°. UV index up to 8. Wind north around 3 mph, gusting to 23 mph.
Wednesday night	Mostly clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 59°. Wind north-northeast around 2 mph, gusting to 19 mph.
Thursday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A slight chance of rain in the afternoon. High 84°. UV index up to 8. Wind northeast around 5 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 59°. Wind northeast around 5 mph, gusting to 16 mph.
Friday	Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. High 82°. UV index up to 7. Wind east around 7 mph, gusting to 24 mph.
Friday night	Fair to partly cloudy in the evening, becoming fair after midnight. Relatively cool. Low 57°. Wind east around 4 mph, gusting to 22 mph.
Saturday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 80°. UV index up to 8. Wind east-northeast around 5 mph, gusting to 26 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Saturday night	Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 61°. Wind north-northeast around 6 mph, gusting to 17 mph, in the evening, becoming east after midnight.
Sunday	Mostly cloudy to cloudy. High 77°. UV index up to 5. Wind east around 6 mph, gusting to 22 mph.
Sunday night	Partly cloudy in the evening, becoming clear after midnight. Relatively cool. Low 57°. Wind east around 4 mph, gusting to 19 mph.
Monday	Sunny. High 81°. UV index up to 10. Wind east around 4 mph, gusting to 25 mph.
Monday night	Clear. Relatively cool. Low 56°. Wind east around 2 mph, gusting to 20 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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