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: Thursday, 22-Jan-2026 05:00 am

Today Mostly Cloudy	Tonight Partly Cloudy	Friday Mostly Cloudy	Friday night Mostly Cloudy Cold!	Saturday Snow	Saturday night Snow	Sunday Snow	Sunday night Partly Cloudy
				.1 in. <2 in.	<.25 in. <4 in.	.25 in. <5 in.
High: 39°	Low: 16°	High: 17°	Low: 5°	High: 10°	Low: 6°	High: 8°	Low: 0°
	WCh: 7°		WCh: -7°
W 2-19 mph	WNW→N 2→9-23 mph	N 10-29 mph	NNE 8-25 mph	NE 7-22 mph	NE 6-18 mph	N 9-21 mph	NNW 8-20 mph

Today	Partly to mostly cloudy. High 39°. Wind west around 2 mph, gusting to 19 mph.
Tonight	Fair to partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 16°. Wind chill ranging from 7 to 35. Wind west-northwest around 2 mph in the evening, becoming north around 9 mph, gusting to 23 mph, after midnight.
Friday	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Cold. High 17°, but temperatures falling in the afternoon. Wind chill around 4. Wind north around 10 mph, gusting to 29 mph.
Friday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Cold. Low 5°. Wind chill ranging from -7 to 3. Wind north-northeast around 8 mph, gusting to 25 mph.
Saturday	Dense overcast. A chance of snow. Very cold. High 10°. Wind chill around -5. Wind northeast around 7 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. Snow accumulation 1 to 2 inches.
Saturday night	Dense overcast. Snow likely. Cold. Low 6°. Wind chill as low as -6. Wind northeast around 6 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Snow accumulation 2 to 4 inches.
Sunday	Dense overcast. Snow likely in the morning, then a chance of snow in the afternoon. Very cold. High 8°. Wind chill around -7. Wind north around 9 mph, gusting to 21 mph. Chance of precipitation 70 percent. Precipitation (liquid equivalent) mostly around a quarter of an inch. Snow accumulation 3 to 5 inches.
Sunday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. Very cold. Low 0°. Wind chill as low as -12. Wind north-northwest around 8 mph, gusting to 20 mph.
Monday	Partly cloudy in the morning, becoming sunny in the afternoon. Cold. High 17°. Wind chill ranging from -12 to 9. Wind west-northwest around 6 mph, gusting to 20 mph.
Monday night	Clear. Cold. Low 10°. Wind chill ranging from -3 to 8. Wind south-southwest around 8 mph, gusting to 20 mph.
Tuesday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 35°. Wind chill ranging from -2 to 29. Wind west-southwest around 7 mph, gusting to 22 mph.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Low 23°. Wind west-northwest around 2 mph, gusting to 18 mph, in the evening, becoming east-northeast after midnight.
Wednesday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of snow. High 32°. Wind chill ranging from 17 to 25. Wind north-northeast around 6 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected.
Wednesday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 14°. Wind north-northwest around 2 mph, gusting to 18 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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