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: Friday, 23-Jan-2026 04:00 pm

Tonight Cloudy	Saturday Snow Cold!	Saturday night Snow	Sunday Snow	Sunday night Mostly Cloudy Cold!	Monday Partly Cloudy Cold!	Monday night Clear Cold!	Tuesday Sunny Cold!
	<.1 in. 1 in.	.1 in. 2 in.	.25 in. <5 in.
Low: 2°	High: 9°	Low: 5°	High: 9°	Low: -2°	High: 16°	Low: 6°	High: 32°
	WCh: -10°			WCh: -12°	WCh: -12°	WCh: -7°	WCh: -7°
NNE 8-22 mph	NNE 6-20 mph	NNE 6-19 mph	N 8-18 mph	NNW 7-18 mph	NW 6-22 mph	SW 6-17→10-15 mph	SW→W 9-24 mph

Tonight	Cloudy. Very cold. Low 2°. Wind chill as low as -11. Wind north-northeast around 8 mph, gusting to 22 mph.
Saturday	Dense overcast. A slight chance of snow in the morning, then a chance of snow in the afternoon. Very cold. High 9°. Wind chill ranging from -10 to -3. Wind north-northeast around 6 mph, gusting to 20 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about an inch.
Saturday night	Dense overcast. Snow likely. Cold. Low 5°. Wind chill as low as -5. Wind north-northeast around 6 mph, gusting to 19 mph. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow accumulation around 2 inches.
Sunday	Dense overcast. Snow likely. Very cold. High 9°. Wind chill around -6. Wind north around 8 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly around a quarter of an inch. Snow accumulation 3 to 5 inches.
Sunday night	Partly to mostly cloudy in the evening, becoming fair after midnight. Very cold. Low -2°. Wind chill ranging from -12 to -5. Wind north-northwest around 7 mph, gusting to 18 mph.
Monday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Cold. High 16°. Wind chill ranging from -12 to 6. Wind northwest around 6 mph, gusting to 22 mph.
Monday night	Clear. Cold. Low 6°. Wind chill ranging from -7 to 6. Wind southwest around 6 mph, gusting to 17 mph, in the evening, becoming 10 mph, gusting to 15 mph, after midnight.
Tuesday	Sunny. High 32°. Wind chill ranging from -7 to 24. Wind southwest around 9 mph, gusting to 24 mph, in the morning, becoming west in the afternoon.
Tuesday night	Partly cloudy in the evening, becoming fair after midnight. Cold. Low 10°. Wind west around 4 mph, gusting to 20 mph.
Wednesday	Partly to mostly sunny in the morning, becoming mostly cloudy to cloudy in the afternoon. High 26°. Wind west around 4 mph, gusting to 25 mph.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming fair after midnight. A slight chance of snow. Cold. Low 11°. Wind north around 4 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch.
Thursday	Sunny in the morning, becoming partly to mostly sunny in the afternoon. High 28°. Wind north-northwest around 4 mph, gusting to 21 mph.
Thursday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 14°. Wind northwest near calm in the evening, becoming north-northeast after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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