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, 25-Mar-2026 05:00 am

Today Mostly Sunny	Tonight Partly Cloudy	Thursday Mostly Sunny	Thursday night Thunder storm	Friday Mostly Cloudy	Friday night Clear	Saturday Mostly Sunny	Saturday night Partly Cloudy
			.1 in.	<.1 in.
High: 79°	Low: 53°	High: 93°	Low: 55°	High: 61°	Low: 37°	High: 62°	Low: 41°

SSE 4-24→8-26 mph	S→SW 9-21 mph	SW 11-30 mph	SW→N 10-29 mph	N 12-31 mph	N 6-27 mph	ENE→SE 6-26 mph	SSE 7-24 mph
UV: 7 High		UV: 7 High		UV: 6 High		UV: 6 High

Today	Partly to mostly sunny. Unusually warm. High 79°. UV index up to 7. Wind south-southeast around 4 mph, gusting to 24 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon.
Tonight	Mostly clear in the evening, becoming fair to partly cloudy after midnight. Low 53°. Wind south around 9 mph, gusting to 21 mph, in the evening, becoming southwest after midnight.
Thursday	Partly to mostly sunny. Breezy with near record heat. High 93°. UV index up to 7. Wind southwest around 11 mph, gusting to 30 mph.
Thursday night	Partly cloudy in the evening, becoming cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Mild. Low 55°. Wind southwest around 10 mph, gusting to 29 mph, in the evening, becoming north after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Friday	Mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. A slight chance of rain in the morning. Breezy. High 61°. UV index up to 6. Wind north around 12 mph, gusting to 31 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Clear. Low 37°. Wind north around 6 mph, gusting to 27 mph.
Saturday	Sunny in the morning, becoming mostly sunny in the afternoon. High 62°. UV index up to 6. Wind east-northeast around 6 mph, gusting to 26 mph, in the morning, becoming southeast in the afternoon.
Saturday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 41°. Wind south-southeast around 7 mph, gusting to 24 mph.
Sunday	Partly cloudy. Mild. High 71°. UV index up to 6. Wind south-southeast around 8 mph, gusting to 26 mph.
Sunday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 45°. Wind south around 10 mph, gusting to 22 mph.
Monday	Partly cloudy. A slight chance of rain. Unusually hot. High 82°. UV index up to 6. Wind south-southwest around 10 mph, gusting to 27 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Mild. Low 60°. Wind south-southwest around 10 mph, gusting to 19 mph.
Tuesday	Cloudy in the morning, becoming mostly cloudy in the afternoon. Breezy and unusually hot. High 83°. UV index up to 5. Wind south-southwest around 14 mph, gusting to 32 mph.
Tuesday night	Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Breezy and mild. Low 62°. Wind south-southwest around 15 mph, gusting to 30 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

Powered by Davis Vantage Pro2 and CumulusMX v 4.6.4 (b4128) MXUI Template v 2.2.6 by Silver Acorn Valid HTML5