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, 26-Feb-2026 04:00 pm

Tonight Clear	Friday Sunny	Friday night Clear	Saturday Partly Cloudy	Saturday night Partly Cloudy	Sunday Partly Cloudy	Sunday night Rain likely	Monday Chance rain
			<.1 in.			<.25 in.	.1 in.
Low: 31°	High: 66°	Low: 30°	High: 60°	Low: 30°	High: 44°	Low: 33°	High: 50°

NNW→WSW 2-22 mph	WSW 5-17→9-24 mph	WSW→NNW 6-17 mph	NE→ESE 5-22 mph	NE 9-20 mph	NE 8-24 mph	E 8-22 mph	E 8-22 mph

Tonight	Clear. Low 31°. Wind north-northwest around 2 mph, gusting to 22 mph, in the evening, becoming west-southwest after midnight.
Friday	Sunny. Mild. High 66°. Wind west-southwest around 5 mph, gusting to 17 mph, in the morning, becoming 9 mph, gusting to 24 mph, in the afternoon.
Friday night	Clear. Low 30°. Wind west-southwest around 6 mph, gusting to 17 mph, in the evening, becoming north-northwest after midnight.
Saturday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. A slight chance of rain in the afternoon. Mild. High 60°. Wind northeast around 5 mph, gusting to 22 mph, in the morning, becoming east-southeast in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Saturday night	Partly cloudy in the evening, becoming mostly clear after midnight. Low 30°. Wind northeast around 9 mph, gusting to 20 mph.
Sunday	Partly cloudy in the morning, becoming cloudy in the afternoon. High 44°. Wind northeast around 8 mph, gusting to 24 mph.
Sunday night	Dense overcast in the evening, becoming cloudy after midnight. Rain likely. Low 33°. Wind east around 8 mph, gusting to 22 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Monday	Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 50°. Wind east around 8 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Monday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Low 37°. Wind east around 5 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Tuesday	Dense overcast. Patchy light fog in the morning. Rain likely. High 47°. Wind northeast around 4 mph in the morning, becoming 7 mph in the afternoon. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch.
Tuesday night	Dense overcast. Patchy light fog. Rain likely in the evening, then a chance of rain after midnight. Low 42°. Wind northeast around 6 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Wednesday	Dense overcast. Patchy light fog. Rain likely. High 50°. Wind east around 5 mph. Chance of precipitation 80 percent. Precipitation mostly between 2 and 3 inches.
Wednesday night	Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog. Rain likely in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Relatively mild. Low 48°, but temperatures rising after midnight. Wind east-southeast around 3 mph in the evening, becoming south after midnight. Chance of precipitation 80 percent. Precipitation mostly between 1 and 2 inches.

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