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: Saturday, 24-Jan-2026 04:00 pm

Tonight Mix	Sunday Snow	Sunday night Mostly Cloudy Cold!	Monday Fog a.m. Cold!	Monday night Clear Cold!	Tuesday Mostly Sunny Cold!	Tuesday night Partly Cloudy	Wednesday Partly Cloudy
.25 in. <3 in.	<.25 in. <3 in.
Low: 5°	High: 10°	Low: -4°	High: 15°	Low: 7°	High: 35°	Low: 10°	High: 32°
		WCh: -14°	WCh: -15°	WCh: -8°	WCh: -7°
NE 7-22 mph	N 9-20 mph	NNW 7-19 mph	WNW 6-22 mph	SW 7-19→10-16 mph	W 8-27 mph	NW 3-21 mph	WSW 3-27 mph

Tonight	Dense overcast. A mix of snow and sleet likely. Cold. Low 5°. Wind chill as low as -6. Wind northeast around 7 mph, gusting to 22 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly around a quarter of an inch. Snow or ice (on ground) accumulation 2 to 3 inches.
Sunday	Dense overcast. Snow likely. Very cold. High 10°. Wind chill around -5. Wind north around 9 mph, gusting to 20 mph. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Snow accumulation 2 to 3 inches.
Sunday night	Mostly cloudy in the evening, becoming clear after midnight. Very cold. Low -4°. Wind chill ranging from -14 to -5. Wind north-northwest around 7 mph, gusting to 19 mph.
Monday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Cold. High 15°. Wind chill ranging from -15 to 6. Wind west-northwest around 6 mph, gusting to 22 mph.
Monday night	Clear. Cold. Low 7°. Wind chill ranging from -8 to 5. Wind southwest around 7 mph, gusting to 19 mph, in the evening, becoming 10 mph, gusting to 16 mph, after midnight.
Tuesday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 35°. Wind chill ranging from -7 to 27. Wind west around 8 mph, gusting to 27 mph.
Tuesday night	Partly cloudy in the evening, becoming fair after midnight. Cold. Low 10°. Wind northwest around 3 mph, gusting to 21 mph.
Wednesday	Sunny in the morning, becoming partly cloudy in the afternoon. High 32°. Wind west-southwest around 3 mph, gusting to 27 mph.
Wednesday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 13°. Wind northwest around 4 mph, gusting to 22 mph.
Thursday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 28°. Wind north-northwest around 3 mph, gusting to 21 mph, in the morning, becoming north-northeast in the afternoon.
Thursday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Low 19°. Wind east-northeast around 2 mph.
Friday	Cloudy in the morning, becoming dense overcast in the afternoon. A chance of snow. High 29°. Wind chill ranging from 17 to 24. Wind north-northwest around 3 mph, gusting to 15 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.
Friday night	Dense overcast in the evening, becoming fair after midnight. A chance of snow in the evening, then a slight chance of snow after midnight. Low 16°. Wind chill ranging from 7 to 20. Wind north-northwest around 9 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch.

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