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: Tuesday, 24-Mar-2026 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Partly Cloudy	Thursday Partly Cloudy	Thursday night Thunder storm	Friday Mostly Cloudy	Friday night Partly Cloudy
					.35 in.	<.1 in.
High: 69°	Low: 42°	High: 79°	Low: 52°	High: 91°	Low: 51°	High: 59°	Low: 38°

SE 6-26 mph	SE 6-23 mph	S 5-23→8-26 mph	S 8-20 mph	S 11-30 mph	SW→NNE 8-20→13-28 mph	NNE 11-30 mph	NNE 5-27 mph
UV: 5 Medium		UV: 6 High		UV: 7 High		UV: 7 High

Today	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Mild. High 69°. UV index up to 5. Wind southeast around 6 mph, gusting to 26 mph.
Tonight	Mostly cloudy in the evening, becoming partly cloudy after midnight. Low 42°. Wind southeast around 6 mph, gusting to 23 mph.
Wednesday	Partly cloudy. Unusually warm. High 79°. UV index up to 6. Wind south around 5 mph, gusting to 23 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon.
Wednesday night	Partly cloudy in the evening, becoming fair after midnight. Low 52°. Wind south around 8 mph, gusting to 20 mph.
Thursday	Sunny in the morning, becoming partly cloudy in the afternoon. Near record warmth. High 91°. UV index up to 7. Wind south 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 rain likely after midnight. Scattered thunderstorms likely. Low 51°. Wind southwest around 8 mph, gusting to 20 mph, in the evening, becoming north-northeast around 13 mph, gusting to 28 mph, after midnight. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch.
Friday	Partly to mostly cloudy in the morning, becoming sunny in the afternoon. A slight chance of rain. Breezy. High 59°. UV index up to 7. Wind north-northeast around 11 mph, gusting to 30 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 38°. Wind north-northeast around 5 mph, gusting to 27 mph.
Saturday	Sunny in the morning, becoming mostly sunny in the afternoon. High 62°. UV index up to 7. Wind east-southeast around 4 mph, gusting to 24 mph, in the morning, becoming south-southeast in the afternoon.
Saturday night	Partly cloudy. Low 41°. Wind south around 6 mph, gusting to 21 mph.
Sunday	Partly cloudy. Mild. High 70°. UV index up to 6. Wind south around 8 mph, gusting to 23 mph, in the morning, becoming 11 mph, gusting to 28 mph, in the afternoon.
Sunday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 46°. Wind south around 8 mph, gusting to 23 mph.
Monday	Cloudy in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain. Scattered thundershowers possible. Breezy and unusually warm. High 78°. UV index up to 6. Wind south around 12 mph, gusting to 23 mph, in the morning, becoming 15 mph, gusting to 30 mph, in the afternoon. 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. Breezy and mild. Low 57°. Wind south around 12 mph, gusting to 25 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