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: Monday, 21-Sep-2026 05:00 am

Today Thunder storm	Tonight Mostly Cloudy	Tuesday Mostly Cloudy	Tuesday night Mostly Cloudy	Wednesday Partly Cloudy	Wednesday night Partly Cloudy	Thursday Partly Cloudy	Thursday night Partly Cloudy
<.1 in.		<.1 in.
High: 78°	Low: 63°	High: 72°	Low: 55°	High: 74°	Low: 53°	High: 76°	Low: 55°

N 5-24 mph	N 5-22 mph	N 6-24 mph	NNE 6-24 mph	NNE 7-25 mph	NNE 4-20 mph	NE 5-24 mph	NE 3-19 mph
				UV: 5 Medium		UV: 6 High

Today	Cloudy. A slight chance of rain. Scattered thundershowers possible. High 78°. Wind north around 5 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tonight	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 63°. Wind north around 5 mph, gusting to 22 mph.
Tuesday	Mostly cloudy to cloudy. A chance of rain. High 72°. Wind north around 6 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 55°. Wind north-northeast around 6 mph, gusting to 24 mph.
Wednesday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 74°. UV index up to 5. Wind north-northeast around 7 mph, gusting to 25 mph.
Wednesday night	Fair in the evening, becoming partly cloudy after midnight. Low 53°. Wind north-northeast around 4 mph, gusting to 20 mph.
Thursday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 76°. UV index up to 6. Wind northeast around 5 mph, gusting to 24 mph.
Thursday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 55°. Wind northeast around 3 mph, gusting to 19 mph.
Friday	Mostly cloudy. High 76°. UV index up to 4. Wind east-northeast around 5 mph, gusting to 22 mph.
Friday night	Partly cloudy. Low 55°. Wind east around 4 mph, gusting to 18 mph.
Saturday	Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 74°. Wind east-southeast around 4 mph, gusting to 20 mph.
Saturday night	Partly to mostly cloudy. Patchy light fog after midnight. Low 56°. Wind southeast around 5 mph, gusting to 16 mph.
Sunday	Partly cloudy in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. High 78°. UV index up to 5. Wind east-southeast around 7 mph, gusting to 24 mph.
Sunday night	Clear. Light to moderate fog after midnight. Low 54°. Wind east-northeast around 5 mph, gusting to 19 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