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, 30-Jan-2026 04:00 pm

Tonight Snow	Saturday Mostly Cloudy Cold!	Saturday night Mostly Clear	Sunday Partly Cloudy	Sunday night Partly Cloudy	Monday Partly Cloudy	Monday night Mostly Cloudy	Tuesday Mix
<.1 in. .25 in.							<.1 in.
Low: 8°	High: 24°	Low: 7°	High: 33°	Low: 19°	High: 48°	Low: 28°	High: 37°
WCh: -2°	WCh: -3°						WCh: 24°
NNW 7-22 mph	NNW 8-23 mph	WNW 3-16 mph	SW 4-19 mph	SW 4-18 mph	W 2-26 mph	E 2 mph	NE 5-21 mph

Tonight	Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. A slight chance of snow. Cold. Low 8°. Wind chill ranging from -2 to 12. Wind north-northwest around 7 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch.
Saturday	Mostly sunny in the morning, becoming mostly cloudy in the afternoon. Cold. High 24°. Wind chill ranging from -3 to 16. Wind north-northwest around 8 mph, gusting to 23 mph.
Saturday night	Mostly clear. Cold. Low 7°. Wind west-northwest around 3 mph, gusting to 16 mph.
Sunday	Partly cloudy in the morning, becoming mostly cloudy in the afternoon. High 33°. Wind southwest around 4 mph, gusting to 19 mph.
Sunday night	Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 19°. Wind southwest around 4 mph, gusting to 18 mph.
Monday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Relatively mild. High 48°. Wind west around 2 mph, gusting to 26 mph.
Monday night	Mostly cloudy in the evening, becoming cloudy after midnight. Low 28°. Wind east around 2 mph.
Tuesday	Cloudy. A slight chance of a mix of snow and sleet in the morning, then a slight chance of snow in the afternoon. High 37°. Wind chill ranging from 24 to 31. Wind northeast around 5 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow or ice (on ground) accumulation expected.
Tuesday night	Partly to mostly cloudy in the evening, becoming mostly clear after midnight. Low 21°. Wind north-northeast around 4 mph, gusting to 19 mph.
Wednesday	Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. High 38°. Wind north-northeast around 4 mph, gusting to 25 mph.
Wednesday night	Mostly clear. Low 20°. Wind north-northwest around 2 mph, gusting to 22 mph, in the evening, becoming west after midnight.
Thursday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 47°. Wind southwest around 3 mph, gusting to 23 mph, in the morning, becoming 7 mph, gusting to 25 mph, in the afternoon.
Thursday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 33°. Wind chill ranging from 26 to 41. Wind southwest around 8 mph, gusting to 20 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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