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, 23-Mar-2026 05:00 am

Today Partly Cloudy	Tonight Mostly Cloudy	Tuesday Partly Cloudy	Tuesday night Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Partly Cloudy	Thursday Partly Cloudy	Thursday night Chance rain
							.1 in.
High: 59°	Low: 40°	High: 62°	Low: 39°	High: 75°	Low: 46°	High: 87°	Low: 49°

N 8-28 mph	NE→ESE 5-22 mph	ESE 6-22 mph	ESE→SSE 6-21 mph	S 7-24 mph	SSW 7-17 mph	SSW 9-24→12-28 mph	WSW→N 10-22 mph
UV: 5 Medium		UV: 5 Medium		UV: 6 High		UV: 7 High

Today	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 59°. UV index up to 5. Wind north around 8 mph, gusting to 28 mph.
Tonight	Mostly cloudy in the evening, becoming cloudy after midnight. Low 40°. Wind northeast around 5 mph, gusting to 22 mph, in the evening, becoming east-southeast after midnight.
Tuesday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 62°. UV index up to 5. Wind east-southeast around 6 mph, gusting to 22 mph.
Tuesday night	Partly cloudy. Low 39°. Wind east-southeast around 6 mph, gusting to 21 mph, in the evening, becoming south-southeast after midnight.
Wednesday	Partly cloudy. Unusually warm. High 75°. UV index up to 6. Wind south around 7 mph, gusting to 24 mph.
Wednesday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 46°. Wind south-southwest around 7 mph, gusting to 17 mph.
Thursday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Exceptionally hot. High 87°. UV index up to 7. Wind south-southwest around 9 mph, gusting to 24 mph, in the morning, becoming 12 mph, gusting to 28 mph, in the afternoon.
Thursday night	Partly to mostly cloudy in the evening, becoming cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 49°. Wind west-southwest around 10 mph, gusting to 22 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. Breezy. High 57°. UV index up to 6. Wind north around 12 mph, gusting to 30 mph.
Friday night	Clear. Low 36°. Wind north around 6 mph, gusting to 27 mph.
Saturday	Sunny. High 60°. UV index up to 7. Wind northeast around 3 mph, gusting to 24 mph, in the morning, becoming south-southwest in the afternoon.
Saturday night	Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 42°. Wind south-southeast around 5 mph, gusting to 17 mph.
Sunday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. High 58°. Wind south-southeast around 7 mph, gusting to 23 mph.
Sunday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 45°. Wind south-southeast around 5 mph, gusting to 23 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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