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, 13-Jan-2026 04:00 pm

Tonight Mostly Cloudy	Wednesday Sunny	Wednesday night Clear	Thursday Partly Cloudy	Thursday night Snow	Friday Partly Cloudy	Friday night Mostly Cloudy	Saturday Snow
<.1 in.				<.1 in.			<.1 in.
Low: 36°	High: 41°	Low: 19°	High: 37°	Low: 26°	High: 47°	Low: 23°	High: 26°
		WCh: 12°		WCh: 19°		WCh: 15°
W 8-19 mph	NW 14-32 mph	NW 9-28 mph	NW→W 5-23 mph	SSW 8-18 mph	WSW 10-26→14-31 mph	WNW 11-28 mph	WNW 11-27 mph

Tonight	Cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain. Low 36°. Wind west around 8 mph, gusting to 19 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Wednesday	Sunny. Breezy. High 41°. Wind northwest around 14 mph, gusting to 32 mph.
Wednesday night	Clear. Low 19°. Wind chill ranging from 12 to 27. Wind northwest around 9 mph, gusting to 28 mph.
Thursday	Sunny in the morning, becoming partly cloudy in the afternoon. High 37°. Wind northwest around 5 mph, gusting to 23 mph, in the morning, becoming west in the afternoon.
Thursday night	Mostly cloudy in the evening, becoming partly cloudy after midnight. A slight chance of snow. Low 26°. Wind chill ranging from 19 to 31. Wind south-southwest around 8 mph, gusting to 18 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.
Friday	Sunny in the morning, becoming partly cloudy in the afternoon. Breezy. High 47°. Wind west-southwest around 10 mph, gusting to 26 mph, in the morning, becoming 14 mph, gusting to 31 mph, in the afternoon.
Friday night	Mostly cloudy to cloudy. Breezy. Low 23°. Wind chill ranging from 15 to 35. Wind west-northwest around 11 mph, gusting to 28 mph.
Saturday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. A chance of snow. High 26°. Wind chill around 13. Wind west-northwest around 11 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.
Saturday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Cold. Low 14°. Wind chill ranging from 5 to 13. Wind west-northwest around 6 mph, gusting to 21 mph.
Sunday	Partly to mostly sunny. A chance of snow. High 36°. Wind chill ranging from 5 to 29. Wind southwest around 7 mph, gusting to 28 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.
Sunday night	Partly cloudy. Low 18°. Wind chill ranging from 7 to 24. Wind west around 7 mph, gusting to 20 mph, in the evening, becoming 11 mph, gusting to 23 mph, after midnight.
Monday	Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Breezy. High 28°. Wind chill ranging from 6 to 17. Wind west-northwest around 11 mph, gusting to 26 mph.
Monday night	Fair to partly cloudy in the evening, becoming clear after midnight. Low 15°. Wind chill ranging from 8 to 16. Wind northwest around 10 mph, gusting to 24 mph, in the evening, becoming 7 mph, gusting to 23 mph, after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

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