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: Tuesday, 27-Jan-2026 04:00 pm

Tonight Partly Cloudy	Wednesday Partly Cloudy	Wednesday night Partly Cloudy	Thursday Mostly Cloudy	Thursday night Mostly Cloudy	Friday Partly Cloudy	Friday night Snow	Saturday Partly Cloudy
						<.1 in. .5 in.
Low: 8°	High: 32°	Low: 17°	High: 30°	Low: 16°	High: 27°	Low: 8°	High: 25°
			WCh: 13°		WCh: 10°	WCh: -1°	WCh: -2°
NW 3-19 mph	W 4-20 mph	W→NNE calm	NNE 3-21 mph	NNE 3-19 mph	NNW 6-26 mph	NNW 7-23 mph	NNW 6-23 mph

Tonight	Fair to partly cloudy. Cold. Low 8°. Wind northwest around 3 mph, gusting to 19 mph.
Wednesday	Partly cloudy. High 32°. Wind west around 4 mph, gusting to 20 mph.
Wednesday night	Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 17°. Wind west near calm in the evening, becoming north-northeast after midnight.
Thursday	Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. High 30°. Wind chill ranging from 13 to 24. Wind north-northeast around 3 mph, gusting to 21 mph.
Thursday night	Cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 16°. Wind north-northeast around 3 mph, gusting to 19 mph.
Friday	Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 27°. Wind chill ranging from 10 to 19. Wind north-northwest around 6 mph, gusting to 26 mph.
Friday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. A chance of snow in the evening, then a slight chance of snow after midnight. Cold. Low 8°. Wind chill ranging from -1 to 13. Wind north-northwest around 7 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch.
Saturday	Partly cloudy. Cold. High 25°. Wind chill ranging from -2 to 17. Wind north-northwest around 6 mph, gusting to 23 mph.
Saturday night	Clear in the evening, becoming fair after midnight. Cold. Low 7°. Wind northwest around 3 mph, gusting to 16 mph, in the evening, becoming west-southwest after midnight.
Sunday	Partly to mostly sunny in the morning, becoming mostly cloudy to cloudy in the afternoon. High 36°. Wind chill ranging from 2 to 30. Wind south-southwest around 4 mph, gusting to 21 mph.
Sunday night	Cloudy in the evening, becoming dense overcast after midnight. A chance of snow. Low 27°. Wind chill ranging from 21 to 29. Wind southwest around 6 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch.
Monday	Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. High 43°. Wind southwest around 5 mph, gusting to 27 mph, in the morning, becoming west-northwest in the afternoon.
Monday night	Cloudy. Low 29°. Wind northwest around 2 mph, gusting to 18 mph, in the evening, becoming north after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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