OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CST UTC Last station update CST

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Tuesday, 17-Feb-2026 05:00 am

Today Partly Cloudy	Tonight Partly Cloudy	Wednesday Sunny	Wednesday night Partly Cloudy	Thursday Mostly Sunny	Thursday night Partly Cloudy	Friday Mostly Sunny	Friday night Mostly Cloudy

High: 72°	Low: 55°	High: 76°	Low: 45°	High: 74°	Low: 36°	High: 53°	Low: 30°

SSE 5-18→9-26 mph	S 13-25 mph	WSW 9-28 mph	SSE 4-19 mph	S 6-22→11-28 mph	WSW 12-27 mph	WSW 10-29 mph	WNW 5-21 mph

Today	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually warm. High 72°. Wind south-southeast around 5 mph, gusting to 18 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon.
Tonight	Mostly cloudy in the evening, becoming partly cloudy after midnight. Breezy and relatively mild. Low 55°. Wind south around 13 mph, gusting to 25 mph.
Wednesday	Sunny. Exceptionally warm. High 76°. Wind west-southwest around 9 mph, gusting to 28 mph.
Wednesday night	Fair to partly cloudy in the evening, becoming fair after midnight. Relatively mild. Low 45°. Wind south-southeast around 4 mph, gusting to 19 mph.
Thursday	Partly to mostly sunny. Exceptionally warm. High 74°. Wind south around 6 mph, gusting to 22 mph, in the morning, becoming 11 mph, gusting to 28 mph, in the afternoon.
Thursday night	Mostly clear in the evening, becoming partly cloudy after midnight. Breezy. Low 36°. Wind west-southwest around 12 mph, gusting to 27 mph.
Friday	Sunny in the morning, becoming mostly sunny in the afternoon. Relatively mild. High 53°. Wind west-southwest around 10 mph, gusting to 29 mph.
Friday night	Mostly clear in the evening, becoming mostly cloudy after midnight. Low 30°. Wind west-northwest around 5 mph, gusting to 21 mph.
Saturday	Partly to mostly cloudy. A chance of snow in the morning, then a chance of a mix of rain and snow in the afternoon. High 41°. Wind northwest around 8 mph, gusting to 26 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. No snow accumulation expected.
Saturday night	Partly cloudy in the evening, becoming mostly clear after midnight. Low 25°. Wind chill ranging from 18 to 33. Wind northwest around 8 mph, gusting to 23 mph.
Sunday	Mostly sunny. Breezy. High 33°. Wind chill ranging from 15 to 24. Wind northwest around 13 mph, gusting to 31 mph.
Sunday night	Clear. Cold. Low 21°. Wind chill ranging from 12 to 24. Wind northwest around 10 mph, gusting to 27 mph.
Monday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 40°. Wind northwest around 7 mph, gusting to 26 mph.
Monday night	Mostly clear in the evening, becoming partly to mostly cloudy after midnight. Low 26°. Wind southwest around 2 mph, gusting to 17 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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