| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 11-Nov-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny. Mild. High 69°. Wind south-southwest around 6 mph, gusting to 26 mph, in the morning, becoming west around 12 mph, gusting to 29 mph, in the afternoon. |
| Tonight |
Fair in the evening, becoming partly cloudy after midnight. Low 43°. Wind north-northwest around 9 mph, gusting to 25 mph, in the evening, becoming 5 mph after midnight. |
| Thursday |
Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. High 54°. Wind north-northwest around 8 mph, gusting to 28 mph, in the morning, becoming 11 mph, gusting to 28 mph, in the afternoon. |
| Thursday night |
Partly cloudy. Low 35°. Wind north-northwest around 7 mph, gusting to 26 mph. |
| Friday |
Partly to mostly sunny. High 48°. Wind north-northwest around 8 mph, gusting to 26 mph. |
| Friday night |
Fair in the evening, becoming clear after midnight. Low 29°. Wind north-northwest around 3 mph, gusting to 20 mph. |
| Saturday |
Sunny. High 51°. Wind north-northwest around 2 mph, gusting to 20 mph. |
| Saturday night |
Clear in the evening, becoming fair after midnight. Low 29°. Wind east near calm. |
| Sunday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. High 53°. Wind east around 3 mph, gusting to 23 mph. |
| Sunday night |
Mostly clear. Low 30°. Wind east around 2 mph, gusting to 15 mph. |
| Monday |
Sunny. High 55°. Wind east around 2 mph, gusting to 21 mph. |
| Monday night |
Clear. Low 30°. Wind east around 2 mph. |
| Tuesday |
Sunny. High 57°. Wind east around 3 mph, gusting to 23 mph. |
| Tuesday night |
Clear. Low 33°. Wind east-southeast around 3 mph. |
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