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: Thursday, 28-May-2026 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Friday Mostly Cloudy	Friday night Chance rain	Saturday Partly Cloudy	Saturday night Mostly Cloudy	Sunday Mostly Cloudy	Sunday night Partly Cloudy
			<.1 in.	<.1 in.
High: 87°	Low: 61°	High: 81°	Low: 64°	High: 82°	Low: 62°	High: 86°	Low: 59°

ENE 5-25→9-26 mph	ENE 6-23 mph	ENE 6-23 mph	ESE 5-18 mph	E 4-19→7-25 mph	E 6-23 mph	ESE 6-25 mph	ESE 5-23 mph
UV: 9 Very High		UV: 5 Medium		UV: 8 Very High		UV: 7 High

Today	Partly cloudy. Hot. High 87°. UV index up to 9. Wind east-northeast around 5 mph, gusting to 25 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon.
Tonight	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 61°. Wind east-northeast around 6 mph, gusting to 23 mph.
Friday	Mostly cloudy in the morning, becoming cloudy in the afternoon. High 81°. UV index up to 5. Wind east-northeast around 6 mph, gusting to 23 mph.
Friday night	Dense overcast in the evening, becoming cloudy after midnight. A chance of rain. Precipitation showery or intermittent. Low 64°. Wind east-southeast around 5 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Saturday	Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain. Precipitation showery or intermittent. High 82°. UV index up to 8. Wind east around 4 mph, gusting to 19 mph, in the morning, becoming 7 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Saturday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 62°. Wind east around 6 mph, gusting to 23 mph.
Sunday	Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Hot. High 86°. UV index up to 7. Wind east-southeast around 6 mph, gusting to 25 mph.
Sunday night	Fair to partly cloudy in the evening, becoming mostly clear after midnight. Relatively cool. Low 59°. Wind east-southeast around 5 mph, gusting to 23 mph.
Monday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Hot. High 89°. UV index up to 7. Wind south-southeast around 3 mph, gusting to 28 mph, in the morning, becoming northeast in the afternoon.
Monday night	Fair in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 58°. Wind northeast around 3 mph, gusting to 19 mph.
Tuesday	Sunny in the morning, becoming partly cloudy in the afternoon. Hot. High 86°. UV index up to 8. Wind northeast around 6 mph, gusting to 24 mph.
Tuesday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Relatively cool. Low 59°. Wind east around 6 mph, gusting to 22 mph.
Wednesday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Hot. High 87°. UV index up to 10. Wind east-southeast around 7 mph, gusting to 26 mph.
Wednesday night	Mostly clear. Relatively cool. Low 58°. Wind east-southeast around 7 mph, gusting to 24 mph, in the evening, becoming south-southeast after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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