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 04:00 pm

Tonight Partly Cloudy	Wednesday Mostly Sunny	Wednesday night Partly Cloudy	Thursday Mostly Sunny	Thursday night Rain likely	Friday Mostly Cloudy	Friday night Partly Cloudy	Saturday Mostly Sunny
				.25 in.	<.1 in.
Low: 41°	High: 77°	Low: 52°	High: 89°	Low: 50°	High: 58°	Low: 39°	High: 62°

SE 6-27 mph	S 5-21→8-25 mph	SSW 8-20 mph	SSW 11-29 mph	WSW→NNE 8-19→13-27 mph	NNE 12-30 mph	N 5-26 mph	E→SSE 4-23 mph
	UV: 7 High		UV: 7 High		UV: 7 High		UV: 7 High

Tonight	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 41°. Wind southeast around 6 mph, gusting to 27 mph.
Wednesday	Partly to mostly sunny. Unusually warm. High 77°. UV index up to 7. Wind south around 5 mph, gusting to 21 mph, in the morning, becoming 8 mph, gusting to 25 mph, in the afternoon.
Wednesday night	Fair to partly cloudy. Low 52°. Wind south-southwest around 8 mph, gusting to 20 mph.
Thursday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Near record warmth. High 89°. UV index up to 7. Wind south-southwest around 11 mph, gusting to 29 mph.
Thursday night	Mostly cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then rain likely after midnight. Precipitation showery or intermittent. Low 50°. Wind west-southwest around 8 mph, gusting to 19 mph, in the evening, becoming north-northeast around 13 mph, gusting to 27 mph, after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Friday	Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. A chance of rain. Breezy. High 58°. UV index up to 7. Wind north-northeast around 12 mph, gusting to 30 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Partly cloudy in the evening, becoming clear after midnight. Low 39°. Wind north around 5 mph, gusting to 26 mph.
Saturday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 62°. UV index up to 7. Wind east around 4 mph, gusting to 23 mph, in the morning, becoming south-southeast in the afternoon.
Saturday night	Partly cloudy. Low 40°. Wind south-southeast around 6 mph, gusting to 20 mph.
Sunday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Mild. High 67°. UV index up to 5. Wind south-southeast around 9 mph, gusting to 26 mph.
Sunday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 47°. Wind south around 10 mph, gusting to 23 mph.
Monday	Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Breezy and unusually warm. High 78°. UV index up to 5. Wind south-southwest around 12 mph, gusting to 30 mph, in the morning, becoming 17 mph, gusting to 31 mph, in the afternoon.
Monday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Breezy and mild. Low 60°. Wind south-southwest around 12 mph, gusting to 26 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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