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

Mostly Sunny
Mostly Sunny
Tonight

Mostly Cloudy
Mostly Cloudy
Thursday

Chance rain
Chance rain
Thursday
night
Mostly Cloudy
Mostly Cloudy
Friday

Partly Cloudy
Partly Cloudy
Friday
night
Mostly Cloudy
Mostly Cloudy
Saturday

Thunder storm
Thunder storm
Saturday
night
Thunder storm
Thunder storm
<.1 in. .1 in. <.1 in. <.25 in. .1 in.
High: 64° Low: 45° High: 65° Low: 50° High: 79° Low: 60° High: 68° Low: 60°
               
NW
3-25→7-26
mph
NW→ESE
2-18
mph
SSE
8-23
mph
SSW
6-15
mph
SSW
9-28→15-31
mph
SSW
9-28
mph
SSE
8-24
mph
SSE
8-23
mph
UV: 7
 High 
UV: 5
 Medium 
UV: 6
 High 

 

Today
 
Mostly sunny. High 64°. UV index up to 7. Wind northwest around 3 mph, gusting to 25 mph, in the morning, becoming 7 mph, gusting to 26 mph, in the afternoon.
Tonight
 
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. A chance of rain. Low 45°. Wind northwest around 2 mph, gusting to 18 mph, in the evening, becoming east-southeast after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Thursday
 
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 65°. UV index up to 5. Wind south-southeast around 8 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Thursday night
 
Partly to mostly cloudy. A chance of rain. Low 50°. Wind south-southwest around 6 mph, gusting to 15 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Friday
 
Sunny in the morning, becoming partly cloudy in the afternoon. Breezy and unusually warm. High 79°. UV index up to 6. Wind south-southwest around 9 mph, gusting to 28 mph, in the morning, becoming 15 mph, gusting to 31 mph, in the afternoon.
Friday night
 
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Mild. Low 60°. Wind south-southwest around 9 mph, gusting to 28 mph.
Saturday
 
Dense overcast in the morning, becoming cloudy in the afternoon. Rain likely. Scattered thunderstorms likely. Mild. High 68°. Wind south-southeast around 8 mph, gusting to 24 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch.
Saturday night
 
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Mild. Low 60°. Wind south-southeast around 8 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch.
Sunday
 
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. 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°. UV index up to 5. Wind southwest around 7 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch.
Sunday night
 
Mostly cloudy in the evening, becoming cloudy after midnight. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Low 47°. Wind west-northwest around 10 mph, gusting to 26 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch.
Monday
 
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. High 49°. UV index up to 4. Wind west-northwest around 11 mph, gusting to 29 mph.
Monday night
 
Cloudy in the evening, becoming fair after midnight. Patchy light fog after midnight. A chance of rain. Low 35°. Wind north-northwest around 7 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch.
Tuesday
 
Sunny in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. High 55°. UV index up to 5. Wind north-northeast around 5 mph, gusting to 25 mph, in the morning, becoming east in the afternoon.
Tuesday night
 
Mostly cloudy to cloudy. Low 43°. Wind east-southeast around 8 mph, gusting to 23 mph.

WXSIM forecast formatting script by Saratoga-Weather.org.

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