WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Tuesday, 18-Mar-2025 04:00 pm
 
Tonight

Partly Cloudy
Partly Cloudy
Wednesday

Thunder storm
Thunder storm
Wednesday
night
Cloudy
Cloudy
Thursday

Partly Cloudy
Partly Cloudy
Thursday
night
Clear
Clear
Friday

Partly Cloudy
Partly Cloudy
Friday
night
Mostly Clear
Mostly Clear
Saturday

Sunny
Sunny
<.1 in. <.1 in.
Low: 58° High: 74° Low: 38° High: 50° Low: 33° High: 63° Low: 35° High: 57°
    WCh: 32°          
S
12-33
mph
SSW
15-34→20-38
mph
W→NW
16-36
mph
NW
12-30
mph
W→SW
5-22
mph
S
10-25→14-30
mph
W
10-25
mph
NW
7-25
mph
UV: 6
 High 
UV: 6
 High 
UV: 5
 Medium 
UV: 6
 High 

 

Tonight
 
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Breezy and mild. Low 58°. Wind south around 12 mph, gusting to 33 mph.
Wednesday
 
Partly cloudy. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. Windy and unusually warm. High 74°. UV index up to 6. Wind south-southwest around 15 mph, gusting to 34 mph, in the morning, becoming 20 mph, gusting to 38 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Wednesday night
 
Dense overcast in the evening, becoming cloudy after midnight. A chance of rain. Precipitation showery or intermittent. Windy. Low 38°. Wind chill ranging from 32 to 56. Wind west around 16 mph, gusting to 36 mph, in the evening, becoming northwest after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday
 
Partly cloudy in the morning, becoming sunny in the afternoon. Breezy. High 50°. UV index up to 6. Wind northwest around 12 mph, gusting to 30 mph.
Thursday night
 
Clear in the evening, becoming fair after midnight. Low 33°. Wind west around 5 mph, gusting to 22 mph, in the evening, becoming southwest after midnight.
Friday
 
Partly cloudy. Breezy. High 63°. UV index up to 5. Wind south around 10 mph, gusting to 25 mph, in the morning, becoming 14 mph, gusting to 30 mph, in the afternoon.
Friday night
 
Mostly clear. Low 35°. Wind west around 10 mph, gusting to 25 mph.
Saturday
 
Sunny. High 57°. UV index up to 6. Wind northwest around 7 mph, gusting to 25 mph.
Saturday night
 
Partly cloudy in the evening, becoming cloudy after midnight. A chance of rain after midnight. Low 40°. Wind southeast around 4 mph in the evening, becoming 8 mph, gusting to 15 mph, after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Sunday
 
Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. High 56°. UV index up to 5. Wind south-southeast around 9 mph, gusting to 25 mph, in the morning, becoming south-southwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around half an inch.
Sunday night
 
Fair in the evening, becoming clear after midnight. Low 39°. Wind west around 9 mph, gusting to 20 mph.
Monday
 
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Breezy. High 55°. UV index up to 6. Wind west-northwest around 11 mph, gusting to 29 mph.
Monday night
 
Cloudy in the evening, becoming dense overcast after midnight. A chance of rain. Low 41°. Wind west-northwest around 5 mph, gusting to 21 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.

WXSIM forecast formatting script by Saratoga-Weather.org.

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