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: Sunday, 23-Nov-2025 04:00 pm

Tonight Fog late	Monday Fog a.m.	Monday night Rain likely	Tuesday Fog a.m.	Tuesday night Fog	Wednesday Fog a.m.	Wednesday night Partly Cloudy	Thursday Sunny
	<.1 in.	<.25 in.	<.1 in.
Low: 37°	High: 57°	Low: 47°	High: 59°	Low: 36°	High: 46°	Low: 28°	High: 42°

SE 4 mph	S 5-16 mph	S 5-16 mph	WSW 5-20 mph	W 9-22→13-24 mph	WNW 13-30 mph	WNW 7-22 mph	WNW 9-27 mph

Tonight	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 37°. Wind southeast around 4 mph.
Monday	Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. Light to moderate fog in the morning. A chance of rain. Relatively mild. High 57°. Wind south around 5 mph, gusting to 16 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Cloudy. Patchy light fog. Rain likely. Relatively mild. Low 47°. Wind south around 5 mph, gusting to 16 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Tuesday	Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. Mild. High 59°. Wind west-southwest around 5 mph, gusting to 20 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Fair to partly cloudy in the evening, becoming clear after midnight. Patchy light fog. Breezy. Low 36°. Wind west around 9 mph, gusting to 22 mph, in the evening, becoming 13 mph, gusting to 24 mph, after midnight.
Wednesday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Breezy. High 46°. Wind west-northwest around 13 mph, gusting to 30 mph.
Wednesday night	Partly cloudy in the evening, becoming fair after midnight. Low 28°. Wind west-northwest around 7 mph, gusting to 22 mph.
Thursday	Sunny. High 42°. Wind west-northwest around 9 mph, gusting to 27 mph.
Thursday night	Clear in the evening, becoming mostly clear after midnight. Low 25°. Wind northwest around 4 mph, gusting to 17 mph.
Friday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. High 41°. Wind north-northeast near calm in the morning, becoming southeast around 5 mph, gusting to 21 mph, in the afternoon.
Friday night	Cloudy in the evening, becoming dense overcast after midnight. A slight chance of a mix of rain and sleet in the evening, then a chance of a mix of sleet, rain, and snow after midnight. Low 32°. Wind chill ranging from 25 to 34. Wind southeast around 9 mph, gusting to 20 mph. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly around a quarter of an inch. Little or no snow or ice (on ground) accumulation expected.
Saturday	Dense overcast. A mix of rain, snow, and sleet likely in the morning, then rain likely in the afternoon. High 38°. Wind southeast around 11 mph, gusting to 21 mph, in the morning, becoming 7 mph, gusting to 17 mph, in the afternoon. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly between half an inch and one inch. No snow or ice (on ground) accumulation expected.
Saturday night	Dense overcast. Patchy light fog. A slight chance of rain in the evening, then a chance of rain after midnight. Low 37°, but temperatures rising after midnight. Wind south-southeast around 3 mph in the evening, becoming north after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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