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: Saturday, 29-Nov-2025 05:00 am

Today Chance rain	Tonight Rain and Snow	Sunday Mostly Cloudy	Sunday night Mostly Cloudy	Monday Cloudy	Monday night Snow	Tuesday Fog a.m.	Tuesday night Partly Cloudy
.5 in. <4 in.	<.1 in.				<.1 in. .5 in.
High: 35°	Low: 28°	High: 30°	Low: 17°	High: 28°	Low: 20°	High: 32°	Low: 17°
WCh: 20°	WCh: 20°
SE 11-22 mph	WSW 12-28 mph	W 11-28 mph	NW→NNE 5-22→calm mph	E 2 mph	ENE→NNW 2 mph	NW 3-16 mph	SE→S 2 mph

Today	Dense overcast. Snow likely in the morning, then a mix of snow, rain, and sleet likely in the afternoon. High 35°. Wind chill ranging from 20 to 28. Wind southeast around 11 mph, gusting to 22 mph. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly around half an inch. Snow or ice (on ground) accumulation 2 to 4 inches.
Tonight	Cloudy. A slight chance of a mix of snow and rain in the evening, then a slight chance of snow after midnight. Breezy. Low 28°. Wind chill ranging from 20 to 27. Wind west-southwest around 12 mph, gusting to 28 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected.
Sunday	Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Cold. High 30°. Wind chill around 19. Wind west around 11 mph, gusting to 28 mph.
Sunday night	Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 17°. Wind northwest around 5 mph, gusting to 22 mph, in the evening, becoming north-northeast near calm after midnight.
Monday	Cloudy in the morning, becoming dense overcast in the afternoon. High 28°. Wind east around 2 mph.
Monday night	Cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A chance of snow in the evening, then a slight chance of snow after midnight. Low 20°. Wind east-northeast around 2 mph in the evening, becoming north-northwest after midnight. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch.
Tuesday	Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 32°. Wind northwest around 3 mph, gusting to 16 mph.
Tuesday night	Fair in the evening, becoming partly cloudy after midnight. Cold. Low 17°. Wind southeast around 2 mph in the evening, becoming south after midnight.
Wednesday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 40°. Wind south around 5 mph, gusting to 16 mph, in the morning, becoming west-southwest in the afternoon.
Wednesday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 19°. Wind northwest around 5 mph, gusting to 15 mph.
Thursday	Partly cloudy. High 42°. Wind west-northwest around 4 mph, gusting to 19 mph, in the morning, becoming south-southwest in the afternoon.
Thursday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 22°. Wind south around 2 mph, gusting to 21 mph, in the evening, becoming west-southwest after midnight.
Friday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 45°. Wind southwest around 3 mph, gusting to 19 mph.
Friday night	Clear in the evening, becoming mostly clear after midnight. Low 25°. Wind south around 4 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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