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, 20-Nov-2025 04:00 pm

Tonight Chance rain	Friday Rain likely	Friday night Chance rain	Saturday Fog a.m.	Saturday night Clear	Sunday Mostly Sunny	Sunday night Partly Cloudy	Monday Chance rain
<.25 in.	.35 in.	<.1 in.					<.1 in.
Low: 49°	High: 54°	Low: 40°	High: 57°	Low: 32°	High: 61°	Low: 37°	High: 61°

ESE 3 mph	ENE 5 mph	NE 7-15 mph	NNE→NW 4-18 mph	SW 4 mph	SW 3-17 mph	S 4 mph	S 7-21 mph

Tonight	Dense overcast. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Relatively mild. Low 49°. Wind east-southeast around 3 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Friday	Dense overcast in the morning, becoming cloudy in the afternoon. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. High 54°. Wind east-northeast around 5 mph. Chance of precipitation 80 percent. Precipitation mostly between a quarter and half an inch.
Friday night	Cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Low 40°. Wind northeast around 7 mph, gusting to 15 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Saturday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Light to moderate fog in the morning. Relatively mild. High 57°. Wind north-northeast around 4 mph, gusting to 18 mph, in the morning, becoming northwest in the afternoon.
Saturday night	Clear. Low 32°. Wind southwest around 4 mph.
Sunday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Mild. High 61°. Wind southwest around 3 mph, gusting to 17 mph.
Sunday night	Partly cloudy. Low 37°. Wind south around 4 mph.
Monday	Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Mild. High 61°. Wind south around 7 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Monday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Rain likely. Relatively mild. Low 48°. Wind south around 6 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch.
Tuesday	Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Mild. High 63°. Wind west-southwest around 5 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain. Low 40°. Wind west around 9 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday	Cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain. High 42°. Wind northwest around 10 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night	Partly cloudy in the evening, becoming clear after midnight. Low 28°. Wind west around 8 mph, gusting to 19 mph.

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