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: Thursday, 27-Nov-2025 04:00 pm

Tonight Partly Cloudy	Friday Partly Cloudy	Friday night Snow	Saturday Mix	Saturday night Rain and Snow	Sunday Mostly Cloudy	Sunday night Mostly Cloudy	Monday Snow
		.1 in. .5 in.	.75 in. <3 in.	<.25 in. 1 in.			<.1 in. .25 in.
Low: 18°	High: 40°	Low: 29°	High: 33°	Low: 26°	High: 29°	Low: 17°	High: 26°
		WCh: 22°	WCh: 19°	WCh: 16°
WNW 5-18 mph	NW→E 2-15 mph	SE 5-16→8-16 mph	SE 11-22 mph	W 10-20→13-24 mph	WNW 11-25 mph	NW→N 5-19 mph	NE 2 mph

Tonight	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Cold. Low 18°. Wind west-northwest around 5 mph, gusting to 18 mph.
Friday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 40°. Wind northwest around 2 mph, gusting to 15 mph, in the morning, becoming east in the afternoon.
Friday night	Cloudy. A chance of snow after midnight. Low 29°. Wind chill ranging from 22 to 36. Wind southeast around 5 mph, gusting to 16 mph, in the evening, becoming 8 mph, gusting to 16 mph, after midnight. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow accumulation about half an inch.
Saturday	Dense overcast. Snow likely in the morning, then a mix of snow and sleet likely in the afternoon. High 33°. Wind chill ranging from 19 to 24. Wind southeast around 11 mph, gusting to 22 mph. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly between half an inch and one inch. Snow or ice (on ground) accumulation 2 to 3 inches.
Saturday night	Cloudy. Patchy light fog in the evening. A chance of a mix of snow and rain in the evening, then a slight chance of snow after midnight. Breezy. Low 26°. Wind chill ranging from 16 to 23. Wind west around 10 mph, gusting to 20 mph, in the evening, becoming 13 mph, gusting to 24 mph, after midnight. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Snow accumulation about an inch.
Sunday	Mostly cloudy to cloudy. Cold. High 29°. Wind chill around 17. Wind west-northwest around 11 mph, gusting to 25 mph.
Sunday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Cold. Low 17°. Wind northwest around 5 mph, gusting to 19 mph, in the evening, becoming north after midnight.
Monday	Cloudy in the morning, becoming dense overcast in the afternoon. A chance of snow. Cold. High 26°. Wind northeast around 2 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch.
Monday night	Cloudy in the evening, becoming 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 19°. Wind east-northeast around 2 mph in the evening, becoming northwest after midnight. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow accumulation about half an inch.
Tuesday	Mostly cloudy to cloudy. Patchy light fog in the morning. Cold. High 29°. Wind northwest around 3 mph in the morning, becoming west in the afternoon.
Tuesday night	Fair in the evening, becoming mostly clear after midnight. Cold. Low 16°. Wind south around 3 mph.
Wednesday	Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 40°. Wind south around 5 mph in the morning, becoming 8 mph, gusting to 19 mph, in the afternoon.
Wednesday night	Cloudy. Low 27°. Wind chill ranging from 20 to 31. Wind south around 8 mph, gusting to 20 mph, in the evening, becoming west-northwest after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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