| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 03-Oct-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy. Low 50°. Wind east around 1 mph, gusting to 22 mph, in the evening, becoming northwest after midnight. |
| Sunday |
Mostly sunny in the morning, becoming sunny in the afternoon. Warm. High 77°. UV index up to 5. Wind northwest around 3 mph, gusting to 20 mph, in the morning, becoming 6 mph, gusting to 23 mph, in the afternoon. |
| Sunday night |
Clear. Low 47°. Wind north-northwest around 4 mph, gusting to 18 mph. |
| Monday |
Sunny. Warm. High 75°. UV index up to 5. Wind northeast around 4 mph, gusting to 23 mph. |
| Monday night |
Clear. Low 46°. Wind northeast around 2 mph in the evening, becoming east-southeast after midnight. |
| Tuesday |
Sunny. Warm. High 77°. UV index up to 5. Wind south-southeast around 4 mph, gusting to 23 mph. |
| Tuesday night |
Clear. Low 48°. Wind southwest around 2 mph. |
| Wednesday |
Mostly sunny. Warm. High 79°. UV index up to 5. Wind northwest around 4 mph, gusting to 21 mph. |
| Wednesday night |
Clear. Low 48°. Wind north-northwest around 2 mph. |
| Thursday |
Sunny. Warm. High 80°. UV index up to 5. Wind south around 3 mph, gusting to 20 mph. |
| Thursday night |
Mostly clear in the evening, becoming clear after midnight. Low 50°. Wind southeast around 4 mph in the evening, becoming south after midnight. |
| Friday |
Sunny in the morning, becoming partly to mostly cloudy in the afternoon. Warm. High 83°. UV index up to 4. Wind south-southeast around 4 mph, gusting to 15 mph. |
| Friday night |
Partly cloudy. Low 56°. Wind south-southeast around 2 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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