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, 02-Dec-2025 04:00 pm

Tonight Partly Cloudy	Wednesday Mostly Cloudy	Wednesday night Mostly Cloudy	Thursday Sunny	Thursday night Partly Cloudy	Friday Partly Cloudy	Friday night Fair	Saturday Partly Cloudy

Low: 16°	High: 40°	Low: 19°	High: 33°	Low: 17°	High: 41°	Low: 22°	High: 42°
WCh: 11°		WCh: 13°
SSE 4 mph	SSW→W 4-20 mph	NNW 7-20 mph	N→NE 6-19→3-20 mph	E→SSE 2 mph	S 3 mph	SSW→WSW 3 mph	WNW→NNE 2 mph

Tonight	Partly cloudy. Cold. Low 16°. Wind chill ranging from 11 to 21. Wind south-southeast around 4 mph.
Wednesday	Partly to mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 40°. Wind south-southwest around 4 mph, gusting to 20 mph, in the morning, becoming west in the afternoon.
Wednesday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Cold. Low 19°. Wind chill ranging from 13 to 31. Wind north-northwest around 7 mph, gusting to 20 mph.
Thursday	Sunny. High 33°. Wind north around 6 mph, gusting to 19 mph, in the morning, becoming northeast around 3 mph, gusting to 20 mph, in the afternoon.
Thursday night	Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 17°. Wind east around 2 mph in the evening, becoming south-southeast after midnight.
Friday	Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 41°. Wind south around 3 mph.
Friday night	Fair. Low 22°. Wind south-southwest around 3 mph in the evening, becoming west-southwest after midnight.
Saturday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 42°. Wind west-northwest around 2 mph in the morning, becoming north-northeast in the afternoon.
Saturday night	Mostly cloudy to cloudy. A chance of a mix of sleet, freezing rain, rain, and snow in the evening, then a slight chance of a mix of sleet, freezing rain, and snow after midnight. Low 27°. Wind northeast around 3 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow or ice (on ground) accumulation expected. Little if any freezing rain accumulation.
Sunday	Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. A chance of a mix of sleet, snow, and rain in the morning, then a slight chance of a mix of snow, sleet, and rain in the afternoon. High 35°. Wind east-northeast around 4 mph. Chance of precipitation 30 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow or ice (on ground) accumulation expected.
Sunday night	Cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. A chance of snow in the evening, then a slight chance of snow after midnight. Low 22°. Wind north around 5 mph. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Snow accumulation about a quarter inch.
Monday	Partly to mostly sunny in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. High 36°. Wind north-northwest around 2 mph in the morning, becoming south-southeast in the afternoon.
Monday night	Fair to partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 25°. Wind southeast around 3 mph.

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