| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Saturday, 27-Dec-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Tonight |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Unusually mild. Low 52°, but temperatures rising after midnight. Wind south-southeast around 8 mph in the evening, becoming south-southwest after midnight. |
| Sunday |
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. Precipitation showery or intermittent. Breezy and unusually mild. High 68°. Wind south-southwest around 9 mph, gusting to 20 mph, in the morning, becoming west around 15 mph, gusting to 32 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Mostly cloudy in the evening, becoming fair after midnight. Windy. Low 19°. Wind chill ranging from 9 to 46. Wind west-northwest around 17 mph, gusting to 34 mph. |
| Monday |
Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Breezy and cold. High 21°. Wind chill ranging from 3 to 8. Wind west-northwest around 16 mph, gusting to 32 mph. |
| Monday night |
Clear. Cold. Low 13°. Wind chill as low as 1. Wind west-northwest around 10 mph, gusting to 21 mph. |
| Tuesday |
Sunny in the morning, becoming mostly sunny in the afternoon. High 37°. Wind chill ranging from 4 to 31. Wind west-northwest around 7 mph, gusting to 24 mph. |
| Tuesday night |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Low 22°. Wind chill ranging from 15 to 28. Wind west-southwest around 7 mph, gusting to 18 mph. |
| Wednesday |
Partly cloudy in the morning, becoming sunny in the afternoon. Relatively mild. High 47°. Wind west around 6 mph, gusting to 24 mph. |
| Wednesday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Low 26°. Wind west-southwest around 4 mph. |
| Thursday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 39°. Wind north around 6 mph, gusting to 26 mph. |
| Thursday night |
Fair in the evening, becoming clear after midnight. Low 19°. Wind north around 2 mph, gusting to 20 mph, in the evening, becoming west-northwest after midnight. |
| Friday |
Sunny. High 42°. Wind east-southeast around 2 mph, gusting to 22 mph. |
| Friday night |
Partly to mostly cloudy. Low 27°. Wind chill ranging from 20 to 35. Wind southeast around 6 mph, gusting to 19 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.