| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 21-Feb-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 43°. Wind north-northwest around 6 mph, gusting to 25 mph. |
| Tonight |
Clear in the evening, becoming partly cloudy after midnight. Cold. Low 22°. Wind chill ranging from 14 to 36. Wind north-northwest around 8 mph, gusting to 24 mph. |
| Sunday |
Partly cloudy. Breezy and cold. High 28°. Wind chill ranging from 10 to 17. Wind west-northwest around 14 mph, gusting to 31 mph. |
| Sunday night |
Clear in the evening, becoming mostly clear after midnight. Breezy and cold. Low 15°. Wind chill ranging from 3 to 16. Wind west-northwest around 12 mph, gusting to 27 mph. |
| Monday |
Sunny. High 35°. Wind chill ranging from 3 to 29. Wind northwest around 8 mph, gusting to 27 mph. |
| Monday night |
Fair in the evening, becoming partly cloudy after midnight. Cold. Low 20°. Wind west-northwest around 2 mph, gusting to 19 mph, in the evening, becoming south-southwest after midnight. |
| Tuesday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 53°. Wind south-southwest around 7 mph, gusting to 21 mph, in the morning, becoming 12 mph, gusting to 26 mph, in the afternoon. |
| Tuesday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 30°. Wind southwest around 7 mph, gusting to 20 mph. |
| Wednesday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Unusually mild. High 65°. Wind west around 5 mph, gusting to 23 mph, in the morning, becoming south-southwest in the afternoon. |
| Wednesday night |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 37°. Wind south-southwest around 8 mph, gusting to 22 mph, in the evening, becoming west-northwest after midnight. |
| Thursday |
Partly to mostly cloudy in the morning, becoming sunny in the afternoon. High 52°. Wind west-northwest around 11 mph, gusting to 28 mph. |
| Thursday night |
Clear. Low 27°. Wind northwest around 6 mph, gusting to 23 mph, in the evening, becoming near calm after midnight. |
| Friday |
Sunny. Relatively mild. High 58°. UV index up to 4. Wind south-southwest around 4 mph, gusting to 20 mph, in the morning, becoming 7 mph, gusting to 24 mph, in the afternoon. |
| Friday night |
Clear in the evening, becoming fair to partly cloudy after midnight. Low 31°. Wind chill ranging from 25 to 54. Wind south-southwest around 7 mph, gusting to 18 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.