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: Wednesday, 17-Dec-2025 04:00 pm

Tonight Mostly Cloudy	Thursday Rain likely	Thursday night Partly Cloudy	Friday Mostly Sunny	Friday night Partly Cloudy	Saturday Mostly Sunny	Saturday night Partly Cloudy	Sunday Partly Cloudy
	.5 in.
Low: 42°	High: 48°	Low: 25°	High: 41°	Low: 29°	High: 59°	Low: 24°	High: 45°
		WCh: 19°		WCh: 21°
SSE 11-18 mph	S→W 13-19→10-21 mph	W 11-28 mph	W→SW 6-24 mph	SSE 8-16 mph	S→WSW 9-27 mph	NW 8-20→4 mph	NNW→E 3 mph

Tonight	Partly to mostly cloudy in the evening, becoming cloudy after midnight. Relatively mild. Low 42°. Wind south-southeast around 11 mph, gusting to 18 mph.
Thursday	Dense overcast in the morning, becoming mostly cloudy in the afternoon. Patchy light fog. Rain likely in the morning, then a chance of rain in the afternoon. Breezy. High 48°, but temperatures falling in the afternoon. Wind south around 13 mph, gusting to 19 mph, in the morning, becoming west around 10 mph, gusting to 21 mph, in the afternoon. Chance of precipitation 80 percent. Precipitation mostly around half an inch.
Thursday night	Fair in the evening, becoming fair to partly cloudy after midnight. Breezy. Low 25°. Wind chill ranging from 19 to 36. Wind west around 11 mph, gusting to 28 mph.
Friday	Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. High 41°. Wind west around 6 mph, gusting to 24 mph, in the morning, becoming southwest in the afternoon.
Friday night	Clear in the evening, becoming partly cloudy after midnight. Low 29°. Wind chill ranging from 21 to 33. Wind south-southeast around 8 mph, gusting to 16 mph.
Saturday	Partly to mostly sunny. Unusually mild. High 59°. Wind south around 9 mph, gusting to 27 mph, in the morning, becoming west-southwest in the afternoon.
Saturday night	Partly cloudy in the evening, becoming mostly clear after midnight. Low 24°. Wind northwest around 8 mph, gusting to 20 mph, in the evening, becoming 4 mph after midnight.
Sunday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 45°. Wind north-northwest around 3 mph in the morning, becoming east in the afternoon.
Sunday night	Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 29°. Wind chill ranging from 23 to 36. Wind east-southeast around 6 mph.
Monday	Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Relatively mild. High 50°. Wind east-southeast around 7 mph, gusting to 16 mph.
Monday night	Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Low 38°. Wind south-southeast around 6 mph.
Tuesday	Cloudy. A slight chance of rain in the morning, then a chance of rain in the afternoon. Relatively mild. High 52°. Wind south-southeast around 2 mph in the morning, becoming east in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Tuesday night	Cloudy in the evening, becoming dense overcast after midnight. Patchy light fog after midnight. A slight chance of rain. Relatively mild. Low 39°. Wind east-northeast around 2 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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