WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Wednesday, 26-Nov-2025 05:00 am
 
Today

Mostly Sunny
Mostly Sunny
Tonight

Partly Cloudy
Partly Cloudy
Thursday

Mostly Sunny
Mostly Sunny
Thursday
night
Partly Cloudy
Partly Cloudy
Friday

Partly Cloudy
Partly Cloudy
Friday
night
Mix
Mix
Saturday

Freezing Rain
Freezing Rain
Saturday
night
Rain and Snow
Rain and Snow
<.1 in. .75 in.
<2 in.
<.25 in.
High: 45° Low: 28° High: 44° Low: 23° High: 43° Low: 31° High: 36° Low: 28°
          WCh: 26° WCh: 21° WCh: 20°
W
14-33
mph
W
8-24
mph
W
7-25
mph
WNW
5-21
mph
WNW→SW
2-19
mph
ESE
7-20
mph
SE
11-22
mph
SW→W
13-27
mph

 

Today
 
Partly to mostly sunny. Breezy. High 45°. Wind west around 14 mph, gusting to 33 mph.
Tonight
 
Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 28°. Wind west around 8 mph, gusting to 24 mph.
Thursday
 
Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. High 44°. Wind west around 7 mph, gusting to 25 mph.
Thursday night
 
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 23°. Wind west-northwest around 5 mph, gusting to 21 mph.
Friday
 
Partly cloudy. High 43°. Wind west-northwest around 2 mph, gusting to 19 mph, in the morning, becoming southwest in the afternoon.
Friday night
 
Dense overcast in the evening, becoming cloudy after midnight. A chance of a mix of snow, sleet, and rain after midnight. Low 31°. Wind chill ranging from 26 to 38. Wind east-southeast around 7 mph, gusting to 20 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.
Saturday
 
Dense overcast. A mix of snow, sleet, and freezing rain likely in the morning, then a mix of snow, rain, sleet, and freezing rain likely in the afternoon. High 36°. Wind chill ranging from 21 to 27. Wind southeast around 11 mph, gusting to 22 mph. Chance of precipitation 80 percent. Precipitation (liquid equivalent) mostly between half an inch and one inch. Snow or ice (on ground) accumulation 1 to 2 inches. Little if any freezing rain accumulation.
Saturday night
 
Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog in the evening. A chance of a mix of snow and rain in the evening, then a chance of snow after midnight. Breezy. Low 28°. Wind chill ranging from 20 to 27. Wind southwest around 13 mph, gusting to 27 mph, in the evening, becoming west after midnight. Chance of precipitation 60 percent. Precipitation (liquid equivalent) mostly less than a quarter of an inch. Little or no snow accumulation expected.
Sunday
 
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Cold. High 31°. Wind chill around 20. Wind west-northwest around 12 mph, gusting to 27 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon.
Sunday night
 
Mostly cloudy in the evening, becoming cloudy after midnight. Low 21°. Wind north around 4 mph, gusting to 22 mph.
Monday
 
Cloudy. A slight chance of snow in the afternoon. Cold. High 30°. Wind northeast around 4 mph, gusting to 16 mph. Chance of precipitation 20 percent. Precipitation (liquid equivalent) mostly less than a tenth of an inch. Little or no snow accumulation expected.
Monday night
 
Dense overcast in the evening, becoming mostly cloudy after midnight. Cold. Low 19°. Wind north-northeast around 4 mph, gusting to 16 mph.
Tuesday
 
Sunny. High 35°. Wind north-northwest around 3 mph, gusting to 17 mph, in the morning, becoming west-northwest in the afternoon.
Tuesday night
 
Clear. Cold. Low 21°. Wind chill ranging from 15 to 29. Wind south-southeast around 4 mph.

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 USA Weather Finder Badge