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: Sunday, 25-Jan-2026 05:00 am

Today Snow	Tonight Clear Cold!	Monday Partly Cloudy Cold!	Monday night Clear Cold!	Tuesday Mostly Sunny Cold!	Tuesday night Partly Cloudy	Wednesday Mostly Sunny	Wednesday night Snow
.1 in. 2 in.							<.1 in. .25 in.
High: 9°	Low: -5°	High: 17°	Low: 7°	High: 38°	Low: 13°	High: 37°	Low: 14°
	WCh: -14°	WCh: -15°	WCh: -8°	WCh: -7°
N 9-20 mph	NNW 6-19 mph	WNW 5-22 mph	SW 7-20→11-15 mph	W 8-28 mph	NW 3-22 mph	WSW 4-28 mph	NW 4-23 mph

Today	Dense overcast in the morning, becoming cloudy in the afternoon. A chance of snow in the morning, then a slight chance of snow in the afternoon. Very cold. High 9°. Wind chill around -7. Wind north around 9 mph, gusting to 20 mph. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow accumulation around 2 inches.
Tonight	Fair in the evening, becoming clear after midnight. Very cold. Low -5°. Wind chill ranging from -14 to -5. Wind north-northwest around 6 mph, gusting to 19 mph.
Monday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. Cold. High 17°. Wind chill ranging from -15 to 8. Wind west-northwest around 5 mph, gusting to 22 mph.
Monday night	Clear. Cold. Low 7°. Wind chill ranging from -8 to 7. Wind southwest around 7 mph, gusting to 20 mph, in the evening, becoming 11 mph, gusting to 15 mph, after midnight.
Tuesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 38°. Wind chill ranging from -7 to 31. Wind west around 8 mph, gusting to 28 mph.
Tuesday night	Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 13°. Wind northwest around 3 mph, gusting to 22 mph.
Wednesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 37°. Wind west-southwest around 4 mph, gusting to 28 mph.
Wednesday night	Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. A slight chance of snow. Low 14°. Wind northwest around 4 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch.
Thursday	Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 32°. Wind north-northwest near calm.
Thursday night	Mostly cloudy. A chance of snow. Low 19°. Wind east-northeast around 2 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch.
Friday	Mostly cloudy to cloudy. A chance of snow. High 25°. Wind chill around 14. Wind north-northeast around 6 mph, gusting to 26 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch.
Friday night	Partly cloudy. Low 12°. Wind north-northeast around 1 mph, gusting to 22 mph.
Saturday	Mostly sunny in the morning, becoming partly cloudy in the afternoon. High 34°. Wind chill ranging from 13 to 29. Wind south-southeast around 1 mph, gusting to 21 mph, in the morning, becoming 5 mph, gusting to 24 mph, in the afternoon.
Saturday night	Mostly cloudy in the evening, becoming cloudy after midnight. Low 25°. Wind chill ranging from 18 to 27. Wind east-southeast around 6 mph, gusting to 23 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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