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: Sunday, 30-Nov-2025 04:00 pm

Tonight Mostly Cloudy	Monday Cloudy	Monday night Snow	Tuesday Fog a.m.	Tuesday night Fog late	Wednesday Fog a.m.	Wednesday night Snow	Thursday Partly Cloudy
		<.1 in. .5 in.				<.1 in.
Low: 16°	High: 28°	Low: 16°	High: 32°	Low: 17°	High: 39°	Low: 20°	High: 32°
		WCh: 10°		WCh: 11°		WCh: 13°
WNW→NE 3-15 mph	ESE 2 mph	NW calm→4 mph	WNW→SW 4-18 mph	SE 5 mph	SSE→SSW 4 mph	WNW 5-18→9-20 mph	NNW 5-22 mph

Tonight	Mostly cloudy in the evening, becoming cloudy after midnight. Cold. Low 16°. Wind west-northwest around 3 mph, gusting to 15 mph, in the evening, becoming northeast after midnight.
Monday	Cloudy in the morning, becoming dense overcast in the afternoon. High 28°. Wind east-southeast around 2 mph.
Monday night	Dense overcast in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A chance of snow in the evening, then a slight chance of snow after midnight. Cold. Low 16°. Wind chill ranging from 10 to 26. Wind northwest near calm in the evening, becoming 4 mph after midnight. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about half an inch.
Tuesday	Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. High 32°. Wind west-northwest around 4 mph, gusting to 18 mph, in the morning, becoming southwest in the afternoon.
Tuesday night	Fair to partly cloudy in the evening, becoming clear after midnight. Patchy light fog after midnight. Cold. Low 17°. Wind chill ranging from 11 to 26. Wind southeast around 5 mph.
Wednesday	Partly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. High 39°. Wind south-southeast around 4 mph in the morning, becoming south-southwest in the afternoon.
Wednesday night	Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. A slight chance of snow. Cold. Low 20°. Wind chill ranging from 13 to 33. Wind west-northwest around 5 mph, gusting to 18 mph, in the evening, becoming 9 mph, gusting to 20 mph, after midnight. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.
Thursday	Partly cloudy. High 32°. Wind north-northwest around 5 mph, gusting to 22 mph.
Thursday night	Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 20°. Wind east-northeast around 2 mph in the evening, becoming southeast after midnight.
Friday	Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 42°. Wind southeast around 3 mph, gusting to 19 mph.
Friday night	Partly to mostly cloudy in the evening, becoming mostly clear after midnight. Low 23°. Wind south around 4 mph in the evening, becoming southwest after midnight.
Saturday	Sunny in the morning, becoming mostly cloudy in the afternoon. High 48°. Wind south around 6 mph, gusting to 20 mph.
Saturday night	Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 34°. Wind south-southwest around 7 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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