WXSIM Forecast for: O'Fallon
Issued by: OFallonweather.com
Updated: Wednesday, 26-Mar-2025 04:00 pm
 
Tonight

Partly Cloudy
Partly Cloudy
Thursday

Chance rain
Chance rain
Thursday
night
Chance rain
Chance rain
Friday

Partly Cloudy
Partly Cloudy
Friday
night
Partly Cloudy
Partly Cloudy
Saturday

Thunder storm
Thunder storm
Saturday
night
Thunder storm
Thunder storm
Sunday

Thunder storm
Thunder storm
<.1 in. <.25 in. <.25 in. .1 in. <.1 in. <.25 in.
Low: 44° High: 59° Low: 49° High: 78° Low: 60° High: 73° Low: 61° High: 65°
               
NE→SE
3-22
mph
SE
8-19
mph
SE→SSW
6
mph
SSW
9-25→15-31
mph
SSW
12-26→8-18
mph
SSW
9-27
mph
S
7-23
mph
SSW
7-17
mph
UV: 6
 High 

 

Tonight
 
Partly cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain. Low 44°. Wind northeast around 3 mph, gusting to 22 mph, in the evening, becoming southeast after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch.
Thursday
 
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain. High 59°. Wind southeast around 8 mph, gusting to 19 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Thursday night
 
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. A chance of rain. Low 49°. Wind southeast around 6 mph in the evening, becoming south-southwest after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Friday
 
Partly cloudy. Breezy and unusually warm. High 78°. UV index up to 6. Wind south-southwest around 9 mph, gusting to 25 mph, in the morning, becoming 15 mph, gusting to 31 mph, in the afternoon.
Friday night
 
Mostly cloudy in the evening, becoming partly cloudy after midnight. Mild. Low 60°. Wind south-southwest around 12 mph, gusting to 26 mph, in the evening, becoming 8 mph, gusting to 18 mph, after midnight.
Saturday
 
Mostly cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. Warm. High 73°. Wind south-southwest around 9 mph, gusting to 27 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Saturday night
 
Mostly cloudy to cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Mild. Low 61°. Wind south around 7 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Sunday
 
Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog. Rain likely. Thunderstorms very likely, some possibly severe. High 65°. Wind south-southwest around 7 mph, gusting to 17 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Sunday night
 
Mostly cloudy in the evening, becoming cloudy after midnight. Moderate fog in the evening, then patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Low 47°. Wind northwest around 10 mph, gusting to 28 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch.
Monday
 
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. Breezy. High 50°. UV index up to 4. Wind northwest around 12 mph, gusting to 29 mph.
Monday night
 
Mostly cloudy in the evening, becoming fair after midnight. Low 37°. Wind north-northwest around 5 mph, gusting to 24 mph, in the evening, becoming north-northeast around 2 mph after midnight.
Tuesday
 
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 57°. UV index up to 6. Wind east around 5 mph, gusting to 25 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon.
Tuesday night
 
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Low 43°. Wind southeast around 7 mph, gusting to 23 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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