OFallon Missouri Weather

OFallon - Weather Data from OFallon, MO

Latitude: N 38° 50' 20" Longitude: W 90° 43' 42" Altitude: 532 ft

CDT UTC Last station update CDT

WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com

Updated: Wednesday, 11-Mar-2026 04:00 pm

Tonight Mostly Cloudy	Thursday Mostly Sunny	Thursday night Partly Cloudy	Friday Partly Cloudy	Friday night Partly Cloudy	Saturday Partly Cloudy	Saturday night Mostly Cloudy	Sunday Rain likely
							.5 in.
Low: 35°	High: 54°	Low: 39°	High: 58°	Low: 35°	High: 61°	Low: 47°	High: 62°

NW 12-23→8-23 mph	WNW→SW 4-23→8-24 mph	SW 11-23→15-22 mph	WNW 12-27→8-27 mph	N 4-20 mph	E 9-26 mph	SE 8-22 mph	S 12-26 mph
			UV: 4 Medium		UV: 4 Medium

Tonight	Partly to mostly cloudy in the evening, becoming fair after midnight. Low 35°. Wind northwest around 12 mph, gusting to 23 mph, in the evening, becoming 8 mph, gusting to 23 mph, after midnight.
Thursday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. High 54°. Wind west-northwest around 4 mph, gusting to 23 mph, in the morning, becoming southwest around 8 mph, gusting to 24 mph, in the afternoon.
Thursday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Breezy. Low 39°. Wind southwest around 11 mph, gusting to 23 mph, in the evening, becoming 15 mph, gusting to 22 mph, after midnight.
Friday	Partly cloudy. High 58°. UV index up to 4. Wind west-northwest around 12 mph, gusting to 27 mph, in the morning, becoming 8 mph, gusting to 27 mph, in the afternoon.
Friday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 35°. Wind north around 4 mph, gusting to 20 mph.
Saturday	Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Mild. High 61°. UV index up to 4. Wind east around 9 mph, gusting to 26 mph.
Saturday night	Mostly cloudy to cloudy. Low 47°. Wind southeast around 8 mph, gusting to 22 mph.
Sunday	Cloudy in the morning, becoming dense overcast in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Breezy and mild. High 62°. Wind south around 12 mph, gusting to 26 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch.
Sunday night	Dense overcast. Rain likely in the evening, then a chance of a mix of snow and rain after midnight. Windy and cold. Low 27°. Wind chill ranging from 19 to 46. Wind west-northwest around 17 mph, gusting to 33 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly between a quarter and half an inch. Little or no snow accumulation expected.
Monday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. Breezy and very cold. High 30°. Wind chill around 16. Wind west-northwest around 16 mph, gusting to 33 mph.
Monday night	Clear in the evening, becoming fair after midnight. Cold. Low 22°. Wind chill as low as 14. Wind northwest around 10 mph, gusting to 26 mph, in the evening, becoming 7 mph, gusting to 22 mph, after midnight.
Tuesday	Partly to mostly cloudy in the morning, becoming cloudy in the afternoon. Cold. High 39°. Wind west around 4 mph, gusting to 26 mph, in the morning, becoming south in the afternoon.
Tuesday night	Dense overcast in the evening, becoming cloudy after midnight. A chance of snow in the evening, then a chance of a mix of snow and rain after midnight. Low 32°. Wind chill ranging from 25 to 32. Wind east-southeast around 9 mph, gusting to 24 mph, in the evening, becoming south-southeast after midnight. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Little or no snow accumulation expected.

WXSIM forecast formatting script by Saratoga-Weather.org.

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