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, 25-Sep-2026 05:00 am

Today Mostly Cloudy	Tonight Mostly Cloudy	Saturday Mostly Cloudy	Saturday night Mostly Cloudy	Sunday Partly Cloudy	Sunday night Fog late	Monday Fog a.m.	Monday night Mostly Clear
		<.1 in.
High: 73°	Low: 56°	High: 74°	Low: 57°	High: 77°	Low: 52°	High: 76°	Low: 52°

ESE 3-20 mph	ENE 3-18 mph	E 4-22 mph	E 3-18 mph	ESE 4-21 mph	ENE 3-16 mph	ENE 3-20 mph	ENE→SE 3 mph
		UV: 4 Medium		UV: 6 High		UV: 5 Medium

Today	Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. High 73°. Wind east-southeast around 3 mph, gusting to 20 mph.
Tonight	Partly to mostly cloudy. Low 56°. Wind east-northeast around 3 mph, gusting to 18 mph.
Saturday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain. High 74°. UV index up to 4. Wind east around 4 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Saturday night	Dense overcast in the evening, becoming mostly cloudy after midnight. Low 57°. Wind east around 3 mph, gusting to 18 mph.
Sunday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 77°. UV index up to 6. Wind east-southeast around 4 mph, gusting to 21 mph.
Sunday night	Fair. Patchy light fog after midnight. Low 52°. Wind east-northeast around 3 mph, gusting to 16 mph.
Monday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 76°. UV index up to 5. Wind east-northeast around 3 mph, gusting to 20 mph.
Monday night	Mostly clear in the evening, becoming fair after midnight. Low 52°. Wind east-northeast around 3 mph in the evening, becoming southeast after midnight.
Tuesday	Partly cloudy. Warm. High 80°. UV index up to 6. Wind southeast around 6 mph, gusting to 21 mph.
Tuesday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 60°. Wind southeast around 7 mph, gusting to 16 mph.
Wednesday	Cloudy in the morning, becoming mostly cloudy in the afternoon. A chance of rain. Warm. High 82°. UV index up to 5. Wind south around 4 mph, gusting to 17 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming fair to partly cloudy after midnight. Warm. Low 66°. Wind south around 8 mph.
Thursday	Cloudy in the morning, becoming dense overcast in the afternoon. Rain likely. Precipitation showery or intermittent. Warm. High 78°. Wind south around 9 mph, gusting to 17 mph, in the morning, becoming 3 mph in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Thursday night	Dense overcast in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. Rain likely in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Warm. Low 71°. Wind south-southwest around 8 mph, gusting to 20 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch.

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