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 05:00 am

Today Sunny	Tonight Partly Cloudy	Tuesday Mostly Cloudy	Tuesday night Thunder storm	Wednesday Rain likely	Wednesday night Fog	Thursday Fog a.m.	Thursday night Fog late
			.5 in.	.75 in.	<.1 in.	<.1 in.
High: 83°	Low: 57°	High: 81°	Low: 62°	High: 72°	Low: 61°	High: 79°	Low: 60°

ESE 4-24 mph	ESE 3-19 mph	E 4-23 mph	ENE→N 4-18 mph	NNW 5-18 mph	ENE 3 mph	NE 7-24 mph	NE 6-18 mph
UV: 8 Very High		UV: 6 High		UV: 7 High		UV: 8 Very High

Today	Sunny. High 83°. UV index up to 8. Wind east-southeast around 4 mph, gusting to 24 mph.
Tonight	Partly cloudy. Relatively cool. Low 57°. Wind east-southeast around 3 mph, gusting to 19 mph.
Tuesday	Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 81°. UV index up to 6. Wind east around 4 mph, gusting to 23 mph.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Moderate fog after midnight. A slight chance of rain in the evening, then rain likely after midnight. Scattered thunderstorms likely. Low 62°. Wind east-northeast around 4 mph, gusting to 18 mph, in the evening, becoming north after midnight. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Wednesday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate to dense fog in the morning, then moderate fog in the afternoon. Rain likely. Precipitation showery or intermittent. High 72°. UV index up to 7. Wind north-northwest around 5 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation mostly between half an inch and one inch.
Wednesday night	Partly cloudy. Light to moderate fog. A chance of rain. Low 61°. Wind east-northeast around 3 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 79°. UV index up to 8. Wind northeast around 7 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Partly to mostly cloudy. Patchy light fog after midnight. Low 60°. Wind northeast around 6 mph, gusting to 18 mph.
Friday	Partly to mostly cloudy. Patchy light fog in the morning. High 78°. UV index up to 8. Wind east-northeast around 6 mph, gusting to 24 mph.
Friday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. Low 59°. Wind east-northeast around 4 mph, gusting to 21 mph.
Saturday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 78°. UV index up to 9. Wind northeast around 7 mph, gusting to 26 mph.
Saturday night	Partly cloudy in the evening, becoming clear after midnight. Relatively cool. Low 56°. Wind northeast around 8 mph, gusting to 22 mph.
Sunday	Sunny. Breezy. High 70°. UV index up to 10. Wind northeast around 11 mph, gusting to 30 mph.
Sunday night	Clear. Cool. Low 53°. Wind northeast around 6 mph, gusting to 25 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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