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: Friday, 12-Sep-2025 04:00 pm

Tonight Clear	Saturday Mostly Sunny	Saturday night Partly Cloudy	Sunday Partly Cloudy	Sunday night Partly Cloudy	Monday Partly Cloudy	Monday night Partly Cloudy	Tuesday Partly Cloudy
					<.1 in.	<.1 in.
Low: 67°	High: 95°	Low: 67°	High: 95°	Low: 68°	High: 90°	Low: 67°	High: 90°

SE 5-22 mph	SW 5-24 mph	S→SW 4-17 mph	WNW→N 3-21 mph	N→ENE 2 mph	ENE 3-19 mph	E 2 mph	ENE 3-19 mph
	UV: 7 High		UV: 7 High		UV: 5 Medium		UV: 5 Medium

Tonight	Fair in the evening, becoming clear after midnight. Low 67°. Wind southeast around 5 mph, gusting to 22 mph.
Saturday	Mostly sunny. Very hot. High 95°. UV index up to 7. Wind southwest around 5 mph, gusting to 24 mph.
Saturday night	Fair to partly cloudy in the evening, becoming fair after midnight. Low 67°. Wind south around 4 mph, gusting to 17 mph, in the evening, becoming southwest after midnight.
Sunday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Very hot. High 95°. UV index up to 7. Wind west-northwest around 3 mph, gusting to 21 mph, in the morning, becoming north in the afternoon.
Sunday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 68°. Wind north around 2 mph in the evening, becoming east-northeast after midnight.
Monday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain in the afternoon. Precipitation showery or intermittent. Unusually hot. High 90°. UV index up to 5. Wind east-northeast around 3 mph, gusting to 19 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. A slight chance of rain. Precipitation showery or intermittent. Low 67°. Wind east around 2 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tuesday	Partly cloudy. Unusually hot. High 90°. UV index up to 5. Wind east-northeast around 3 mph, gusting to 19 mph.
Tuesday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 64°. Wind east-southeast around 2 mph in the evening, becoming south-southeast after midnight.
Wednesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Very hot. High 91°. UV index up to 6. Wind south-southeast around 4 mph, gusting to 20 mph.
Wednesday night	Partly cloudy. Low 67°. Wind south around 4 mph.
Thursday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain. Precipitation showery or intermittent. Warm. High 82°. Wind west-southwest around 6 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Low 66°. Wind west around 4 mph, gusting to 17 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

Powered by Davis Vantage Pro2 and CumulusMX v 4.5.2 (b4105) MXUI Template v 2.2.6 by Silver Acorn Valid HTML5