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: Monday, 25-May-2026 04:00 pm

Tonight Partly Cloudy	Tuesday Mostly Cloudy	Tuesday night Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Fog late	Thursday Fog a.m.	Thursday night Fog late	Friday Partly Cloudy
	<.1 in.		<.1 in.				<.1 in.
Low: 60°	High: 76°	Low: 61°	High: 83°	Low: 61°	High: 83°	Low: 60°	High: 81°

ESE 3-23 mph	ENE 4-21 mph	ENE 3-18 mph	N 4-22 mph	NNE 3-17 mph	NE 5-20→8-25 mph	NE 6-21 mph	E 5-24 mph
	UV: 5 Medium		UV: 8 Very High		UV: 8 Very High		UV: 8 Very High

Tonight	Partly cloudy. Low 60°. Wind east-southeast around 3 mph, gusting to 23 mph.
Tuesday	Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain. High 76°. UV index up to 5. Wind east-northeast around 4 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. Low 61°. Wind east-northeast around 3 mph, gusting to 18 mph.
Wednesday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. A slight chance of rain. High 83°. UV index up to 8. Wind north around 4 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Partly cloudy. Patchy light fog after midnight. Low 61°. Wind north-northeast around 3 mph, gusting to 17 mph.
Thursday	Partly to mostly cloudy. Patchy light fog in the morning. High 83°. UV index up to 8. Wind northeast around 5 mph, gusting to 20 mph, in the morning, becoming 8 mph, gusting to 25 mph, in the afternoon.
Thursday night	Partly to mostly cloudy. Patchy light fog after midnight. Low 60°. Wind northeast around 6 mph, gusting to 21 mph.
Friday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain. High 81°. UV index up to 8. Wind east around 5 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Partly cloudy. Patchy light fog after midnight. Low 60°. Wind east around 4 mph, gusting to 18 mph.
Saturday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 83°. UV index up to 9. Wind east-northeast around 8 mph, gusting to 27 mph.
Saturday night	Fair in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 57°. Wind east-northeast around 6 mph, gusting to 24 mph.
Sunday	Sunny. High 73°. UV index up to 10. Wind east-northeast around 8 mph, gusting to 29 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon.
Sunday night	Clear. Cool. Low 53°. Wind east-northeast around 6 mph, gusting to 25 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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