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: Wednesday, 27-May-2026 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Thursday Mostly Cloudy	Thursday night Mostly Cloudy	Friday Thunder storm	Friday night Partly Cloudy	Saturday Partly Cloudy	Saturday night Partly Cloudy
				<.1 in.
High: 89°	Low: 66°	High: 88°	Low: 65°	High: 84°	Low: 62°	High: 86°	Low: 60°

NW→N 1-23→4-23 mph	NE 2-21 mph	ENE 4-24→7-26 mph	ENE 5-22 mph	E 6-24 mph	ESE 3-19 mph	ESE 5-25 mph	E 5-22 mph
UV: 8 Very High		UV: 8 Very High		UV: 6 High		UV: 9 Very High

Today	Partly cloudy in the morning, becoming mostly sunny in the afternoon. Hot. High 89°. UV index up to 8. Wind northwest around 1 mph, gusting to 23 mph, in the morning, becoming north around 4 mph, gusting to 23 mph, in the afternoon.
Tonight	Partly cloudy. Low 66°. Wind northeast around 2 mph, gusting to 21 mph.
Thursday	Partly to mostly cloudy. Hot. High 88°. UV index up to 8. Wind east-northeast around 4 mph, gusting to 24 mph, in the morning, becoming 7 mph, gusting to 26 mph, in the afternoon.
Thursday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 65°. Wind east-northeast around 5 mph, gusting to 22 mph.
Friday	Mostly cloudy. A slight chance of rain in the afternoon. Scattered thundershowers possible. High 84°. UV index up to 6. Wind east around 6 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 62°. Wind east-southeast around 3 mph, gusting to 19 mph.
Saturday	Partly cloudy in the morning, becoming mostly sunny in the afternoon. Hot. High 86°. UV index up to 9. Wind east-southeast around 5 mph, gusting to 25 mph.
Saturday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 60°. Wind east around 5 mph, gusting to 22 mph.
Sunday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Warm. High 85°. UV index up to 7. Wind east around 6 mph, gusting to 24 mph.
Sunday night	Fair to partly cloudy in the evening, becoming clear after midnight. Relatively cool. Low 58°. Wind east around 4 mph, gusting to 23 mph.
Monday	Partly to mostly sunny. Warm. High 84°. UV index up to 9. Wind northeast around 5 mph, gusting to 24 mph, in the morning, becoming 9 mph, gusting to 27 mph, in the afternoon.
Monday night	Clear. Relatively cool. Low 59°. Wind northeast around 9 mph, gusting to 26 mph.
Tuesday	Sunny. Breezy. High 77°. UV index up to 10. Wind northeast around 12 mph, gusting to 30 mph.
Tuesday night	Clear. Relatively cool. Low 56°. Wind north-northeast around 7 mph, gusting to 26 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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