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: Friday, 21-Nov-2025 04:00 pm

Tonight Chance rain	Saturday Partly Cloudy	Saturday night Fog late	Sunday Fog a.m.	Sunday night Partly Cloudy	Monday Mostly Cloudy	Monday night Rain likely	Tuesday Fog a.m.
<.25 in.					<.1 in.	<.25 in.	<.1 in.
Low: 45°	High: 60°	Low: 37°	High: 61°	Low: 37°	High: 54°	Low: 46°	High: 60°

NNE 5 mph	NNE→WNW 4-20 mph	WNW 4 mph	NW→ESE 3-17 mph	SE 4 mph	SE 7-18 mph	SE→SSW 8-17 mph	W 8-24 mph

Tonight	Cloudy. Patchy light fog in the evening. A chance of rain in the evening, then a slight chance of rain after midnight. Relatively mild. Low 45°. Wind north-northeast around 5 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Saturday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Mild. High 60°. Wind north-northeast around 4 mph, gusting to 20 mph, in the morning, becoming west-northwest in the afternoon.
Saturday night	Fair. Patchy light fog after midnight. Low 37°. Wind west-northwest around 4 mph.
Sunday	Mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Mild. High 61°. Wind northwest around 3 mph, gusting to 17 mph, in the morning, becoming east-southeast in the afternoon.
Sunday night	Mostly clear in the evening, becoming partly cloudy after midnight. Low 37°. Wind southeast 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. High 54°. Wind southeast around 7 mph, gusting to 18 mph. Chance of precipitation 30 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. Rain likely. Low 46°. Wind southeast around 8 mph, gusting to 17 mph, in the evening, becoming south-southwest after midnight. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Tuesday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. Mild. High 60°. Wind west around 8 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. Low 41°. Wind west around 10 mph, gusting to 21 mph, in the evening, becoming 6 mph, gusting to 20 mph, after midnight.
Wednesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. High 53°. Wind west around 7 mph, gusting to 26 mph.
Wednesday night	Clear in the evening, becoming fair after midnight. Patchy light fog. Low 32°. Wind west around 6 mph, gusting to 22 mph.
Thursday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. High 41°. Wind west around 9 mph, gusting to 29 mph, in the morning, becoming 13 mph, gusting to 29 mph, in the afternoon.
Thursday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 29°. Wind west around 9 mph, gusting to 25 mph.

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