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: Saturday, 04-Apr-2026 04:00 pm

Tonight Partly Cloudy	Sunday Mostly Sunny	Sunday night Partly Cloudy	Monday Mostly Sunny	Monday night Mostly Cloudy	Tuesday Partly Cloudy	Tuesday night Partly Cloudy	Wednesday Partly Cloudy
					<.1 in.
Low: 40°	High: 60°	Low: 39°	High: 62°	Low: 41°	High: 55°	Low: 40°	High: 72°

WNW 8-18 mph	WNW 9-28 mph	WNW 5-22 mph	NNW 8-26 mph	N 7-23 mph	NE→ESE 7-26 mph	ESE 7-24 mph	SSE 10-28 mph
	UV: 6 High		UV: 6 High		UV: 5 Medium		UV: 5 Medium

Tonight	Fair to partly cloudy. Low 40°. Wind west-northwest around 8 mph, gusting to 18 mph.
Sunday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. High 60°. UV index up to 6. Wind west-northwest around 9 mph, gusting to 28 mph.
Sunday night	Fair to partly cloudy in the evening, becoming fair after midnight. Low 39°. Wind west-northwest around 5 mph, gusting to 22 mph.
Monday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 62°. UV index up to 6. Wind north-northwest around 8 mph, gusting to 26 mph.
Monday night	Partly to mostly cloudy in the evening, becoming cloudy after midnight. Low 41°. Wind north around 7 mph, gusting to 23 mph.
Tuesday	Cloudy in the morning, becoming partly cloudy in the afternoon. A slight chance of rain. High 55°. UV index up to 5. Wind northeast around 7 mph, gusting to 26 mph, in the morning, becoming east-southeast in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Partly cloudy. Cool. Low 40°. Wind east-southeast around 7 mph, gusting to 24 mph.
Wednesday	Partly cloudy. Mild. High 72°. UV index up to 5. Wind south-southeast around 10 mph, gusting to 28 mph.
Wednesday night	Partly cloudy in the evening, becoming mostly clear after midnight. Low 45°. Wind south around 9 mph, gusting to 24 mph.
Thursday	Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. Warm. High 74°. UV index up to 5. Wind south-southwest around 8 mph, gusting to 26 mph.
Thursday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Low 52°. Wind east-southeast around 4 mph.
Friday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Breezy and warm. High 75°. UV index up to 6. Wind south-southeast around 9 mph, gusting to 23 mph, in the morning, becoming 13 mph, gusting to 28 mph, in the afternoon.
Friday night	Cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 53°. Wind south-southeast around 8 mph, gusting to 22 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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