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: Saturday, 06-Dec-2025 05:00 am

Today Mostly Cloudy	Tonight Mostly Cloudy	Sunday Mostly Cloudy	Sunday night Partly Cloudy	Monday Mostly Sunny	Monday night Partly Cloudy	Tuesday Mostly Sunny	Tuesday night Mostly Cloudy

High: 49°	Low: 37°	High: 39°	Low: 21°	High: 40°	Low: 25°	High: 54°	Low: 35°
					WCh: 17°
WSW→SE 2-17 mph	SSE 5 mph	NNW 5-19→9-26 mph	NNW 8-25→5-21 mph	N→ESE 2-17 mph	S 7 mph	SW 9-23 mph	SW 13-19 mph

Today	Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Relatively mild. High 49°. Wind west-southwest around 2 mph, gusting to 17 mph, in the morning, becoming southeast in the afternoon.
Tonight	Mostly cloudy to cloudy. Low 37°. Wind south-southeast around 5 mph.
Sunday	Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. High 39°. Wind north-northwest around 5 mph, gusting to 19 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon.
Sunday night	Partly cloudy. Low 21°. Wind north-northwest around 8 mph, gusting to 25 mph, in the evening, becoming 5 mph, gusting to 21 mph, after midnight.
Monday	Partly to mostly sunny in the morning, becoming sunny in the afternoon. High 40°. Wind north around 2 mph, gusting to 17 mph, in the morning, becoming east-southeast in the afternoon.
Monday night	Mostly clear in the evening, becoming partly cloudy after midnight. Low 25°. Wind chill ranging from 17 to 32. Wind south around 7 mph.
Tuesday	Partly to mostly sunny. Relatively mild. High 54°. Wind southwest around 9 mph, gusting to 23 mph.
Tuesday night	Mostly cloudy to cloudy in the evening, becoming partly to mostly cloudy after midnight. Breezy. Low 35°. Wind southwest around 13 mph, gusting to 19 mph.
Wednesday	Mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Breezy. High 45°. Wind west-northwest around 13 mph, gusting to 29 mph.
Wednesday night	Mostly cloudy to cloudy. A slight chance of a mix of sleet, snow, and rain in the evening, then a slight chance of a mix of sleet, freezing rain, snow, and rain after midnight. Low 30°. Wind west-northwest around 3 mph, gusting to 23 mph, in the evening, becoming south-southeast after midnight. 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.
Thursday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of a mix of snow and sleet in the morning, then a slight chance of a mix of rain and snow in the afternoon. High 44°. Wind south around 5 mph, gusting to 21 mph, in the morning, becoming 9 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow or ice (on ground) accumulation expected.
Thursday night	Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of a mix of snow and rain in the evening, then a slight chance of snow after midnight. Breezy. Low 26°. Wind chill ranging from 18 to 35. Wind west-northwest around 12 mph, gusting to 30 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. No snow accumulation expected.
Friday	Sunny. Breezy. High 30°. Wind chill around 17. Wind northwest around 13 mph, gusting to 31 mph.
Friday night	Fair to partly cloudy in the evening, becoming clear after midnight. Breezy and cold. Low 14°. Wind chill ranging from 0 to 14. Wind northwest around 13 mph, gusting to 30 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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