| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
||||||||||||||||||||||||||||||||||||||||||||||||
| Updated: Friday, 20-Feb-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
|
| Tonight |
Mostly clear in the evening, becoming mostly cloudy after midnight. Low 27°. Wind northwest around 4 mph, gusting to 21 mph. |
| Saturday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. High 44°. Wind north-northwest around 6 mph, gusting to 26 mph. |
| Saturday night |
Clear. Low 24°. Wind chill ranging from 15 to 36. Wind north-northwest around 9 mph, gusting to 26 mph. |
| Sunday |
Mostly sunny in the morning, becoming sunny in the afternoon. Breezy and cold. High 32°. Wind chill ranging from 12 to 22. Wind northwest around 13 mph, gusting to 31 mph. |
| Sunday night |
Clear in the evening, becoming mostly clear after midnight. Breezy and cold. Low 16°. Wind chill ranging from 6 to 21. Wind northwest around 11 mph, gusting to 28 mph. |
| Monday |
Sunny. High 37°. Wind northwest around 8 mph, gusting to 26 mph. |
| Monday night |
Fair to partly cloudy. Low 21°. Wind northwest around 2 mph, gusting to 21 mph, in the evening, becoming south-southwest after midnight. |
| Tuesday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 51°. Wind south-southwest around 9 mph, gusting to 24 mph. |
| Tuesday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 29°. Wind southwest around 5 mph, gusting to 18 mph. |
| Wednesday |
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Unusually mild. High 66°. Wind southeast around 2 mph, gusting to 18 mph, in the morning, becoming 6 mph, gusting to 23 mph, in the afternoon. |
| Wednesday night |
Mostly cloudy to cloudy. A chance of rain. Low 37°. Wind south-southwest around 10 mph, gusting to 20 mph, in the evening, becoming northwest after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. High 45°. Wind west-northwest around 6 mph, gusting to 18 mph, in the morning, becoming 16 mph, gusting to 31 mph, in the afternoon. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Thursday night |
Clear. Patchy light fog after midnight. Low 29°. Wind northwest around 12 mph, gusting to 30 mph, in the evening, becoming 5 mph, gusting to 20 mph, after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.