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: Monday, 02-Mar-2026 05:00 am

Today Cloudy	Tonight Chance rain	Tuesday Rain likely	Tuesday night Rain likely	Wednesday Rain likely	Wednesday night Rain likely	Thursday Rain likely	Thursday night Partly Cloudy
	<.25 in.	.5 in.	.25 in.	.5 in.	.25 in.	.25 in.
High: 47°	Low: 35°	High: 48°	Low: 39°	High: 52°	Low: 47°	High: 66°	Low: 49°

ESE 7-20 mph	ESE 4-17 mph	E 4 mph	NNE 5 mph	ENE→SE 3 mph	ESE→S 3 mph	SW 3→9-22 mph	SW→SSE 3-16 mph

Today	Cloudy. High 47°. Wind east-southeast around 7 mph, gusting to 20 mph.
Tonight	Cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 35°. Wind east-southeast around 4 mph, gusting to 17 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Tuesday	Dense overcast in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. High 48°. Wind east around 4 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Tuesday night	Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then rain likely after midnight. Low 39°. Wind north-northeast around 5 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch.
Wednesday	Dense overcast. Patchy light fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. High 52°. Wind east-northeast around 3 mph in the morning, becoming southeast in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Wednesday night	Dense overcast. Patchy light fog. Rain likely. Relatively mild. Low 47°, but temperatures rising after midnight. Wind east-southeast around 3 mph in the evening, becoming south after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Thursday	Cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. Rain likely in the morning, then a slight chance of rain in the afternoon. Mild. High 66°. Wind southwest around 3 mph in the morning, becoming 9 mph, gusting to 22 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch.
Thursday night	Partly cloudy in the evening, becoming mostly cloudy after midnight. Relatively mild. Low 49°. Wind southwest around 3 mph, gusting to 16 mph, in the evening, becoming south-southeast after midnight.
Friday	Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Unusually warm. High 75°. UV index up to 5. Wind south around 6 mph, gusting to 17 mph, in the morning, becoming 12 mph, gusting to 24 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Friday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Relatively mild. Low 55°. Wind south-southwest around 8 mph, gusting to 18 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Saturday	Dense overcast. 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. Mild. High 62°. Wind southwest around 6 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch.
Saturday night	Dense overcast. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Relatively mild. Low 52°. Wind west-southwest around 5 mph, gusting to 15 mph, in the evening, becoming northwest after midnight. Chance of precipitation 80 percent. Precipitation mostly between 1 and 2 inches.
Sunday	Cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog. A chance of rain. High 55°. Wind north-northwest around 3 mph in the morning, becoming west in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Sunday night	Cloudy. Patchy light fog. Relatively mild. Low 51°. Wind south-southwest around 4 mph.

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