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 05:00 am

Today Mostly Sunny	Tonight Partly Cloudy	Monday Mostly Cloudy	Monday night Rain likely	Tuesday Fog a.m.	Tuesday night Partly Cloudy	Wednesday Fog a.m.	Wednesday night Partly Cloudy
		<.1 in.	<.25 in.	<.1 in.
High: 63°	Low: 41°	High: 61°	Low: 49°	High: 61°	Low: 43°	High: 50°	Low: 32°

WNW→ESE 2-18 mph	ESE→SSE 3 mph	SSE 5-20 mph	SSE 5-19 mph	W 5-21 mph	W 9-21→12-27 mph	W 13-32 mph	W 7-25 mph

Today	Mostly sunny. Mild. High 63°. Wind west-northwest around 2 mph, gusting to 18 mph, in the morning, becoming east-southeast in the afternoon.
Tonight	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 41°. Wind east-southeast around 3 mph in the evening, becoming south-southeast after midnight.
Monday	Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain. Mild. High 61°. Wind south-southeast around 5 mph, gusting to 20 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Cloudy. Patchy light fog after midnight. Rain likely. Relatively mild. Low 49°. Wind south-southeast around 5 mph, gusting to 19 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 61°. Wind west around 5 mph, gusting to 21 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 fair after midnight. Low 43°. Wind west around 9 mph, gusting to 21 mph, in the evening, becoming 12 mph, gusting to 27 mph, after midnight.
Wednesday	Sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Breezy. High 50°. Wind west around 13 mph, gusting to 32 mph.
Wednesday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Low 32°. Wind west around 7 mph, gusting to 25 mph.
Thursday	Sunny. High 47°. Wind west around 8 mph, gusting to 27 mph.
Thursday night	Clear in the evening, becoming fair to partly cloudy after midnight. Low 28°. Wind northwest around 4 mph, gusting to 19 mph.
Friday	Mostly cloudy to cloudy. High 44°. Wind north-northeast around 3 mph, gusting to 22 mph, in the morning, becoming east-southeast in the afternoon.
Friday night	Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of a mix of rain and snow after midnight. Low 35°. Wind east-southeast around 6 mph, gusting to 20 mph. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly around a quarter of an inch. Little or no snow accumulation expected.
Saturday	Dense overcast. A mix of rain, snow, and sleet likely in the morning, then a chance of rain in the afternoon. High 41°. Wind southeast around 9 mph, gusting to 21 mph. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly between a quarter and half an inch. No snow or ice (on ground) accumulation expected.
Saturday night	Dense overcast. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 40°, but temperatures rising after midnight. Wind south-southeast around 5 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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