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, 03-Dec-2025 04:00 pm

Tonight Fog late	Thursday Fog a.m.	Thursday night Partly Cloudy	Friday Mostly Sunny	Friday night Partly Cloudy	Saturday Partly Cloudy	Saturday night Rain and Snow	Sunday Mix
						.1 in.	<.1 in.
Low: 20°	High: 33°	Low: 16°	High: 41°	Low: 25°	High: 43°	Low: 31°	High: 39°

NNW 4-19→8-21 mph	N→NE 3-19 mph	E→SSE calm	SSE 4-17 mph	SW 5 mph	WNW→ENE 3-19 mph	ESE 6-16 mph	N 4-17→9-26 mph

Tonight	Dense overcast in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog after midnight. Low 20°. Wind north-northwest around 4 mph, gusting to 19 mph, in the evening, becoming 8 mph, gusting to 21 mph, after midnight.
Thursday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 33°. Wind north around 3 mph, gusting to 19 mph, in the morning, becoming northeast in the afternoon.
Thursday night	Fair to partly cloudy. Cold. Low 16°. Wind east near calm in the evening, becoming south-southeast after midnight.
Friday	Mostly sunny in the morning, becoming sunny in the afternoon. High 41°. Wind south-southeast around 4 mph, gusting to 17 mph.
Friday night	Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 25°. Wind southwest around 5 mph.
Saturday	Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 43°. Wind west-northwest around 3 mph, gusting to 19 mph, in the morning, becoming east-northeast in the afternoon.
Saturday night	Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. A chance of a mix of rain and snow after midnight. Low 31°. Wind east-southeast around 6 mph, gusting to 16 mph. Chance of precipitation 50 percent. Precipitation (liquid equivalent) mostly around a tenth of an inch. No snow accumulation expected.
Sunday	Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of a mix of rain, sleet, and snow. High 39°. Wind chill around 30. Wind north around 4 mph, gusting to 17 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. 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	Mostly cloudy to cloudy in the evening, becoming partly cloudy after midnight. Low 22°. Wind north around 7 mph, gusting to 25 mph.
Monday	Partly to mostly sunny. High 39°. Wind north-northeast around 2 mph, gusting to 19 mph, in the morning, becoming south in the afternoon.
Monday night	Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 26°. Wind chill ranging from 18 to 32. Wind south around 6 mph, gusting to 18 mph, in the evening, becoming 9 mph after midnight.
Tuesday	Sunny in the morning, becoming partly cloudy in the afternoon. High 50°. Wind west-southwest around 9 mph, gusting to 22 mph.
Tuesday night	Mostly cloudy in the evening, becoming cloudy after midnight. Low 36°. Wind south-southwest around 9 mph in the evening, becoming 12 mph, gusting to 17 mph, after midnight.

WXSIM forecast formatting script by Saratoga-Weather.org.

Powered by Davis Vantage Pro2 and CumulusMX v 4.5.2 (b4105) MXUI Template v 2.2.6 by Silver Acorn Valid HTML5