| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 17-Oct-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair. Cool. Low 38°. Wind south-southeast around 2 mph. |
| Sunday |
Mostly sunny. High 66°. UV index up to 5. Wind south-southeast around 5 mph, gusting to 24 mph. |
| Sunday night |
Fair. Low 41°. Wind south-southeast around 4 mph, gusting to 17 mph. |
| Monday |
Partly to mostly sunny. High 69°. UV index up to 4. Wind south around 2 mph, gusting to 21 mph. |
| Monday night |
Fair to partly cloudy. Low 43°. Wind east around 2 mph in the evening, becoming south-southeast after midnight. |
| Tuesday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Mild. High 71°. UV index up to 4. Wind southeast around 2 mph, gusting to 21 mph. |
| Tuesday night |
Mostly clear in the evening, becoming clear after midnight. Low 42°. Wind east-southeast around 2 mph in the evening, becoming south-southeast after midnight. |
| Wednesday |
Sunny. Mild. High 71°. UV index up to 5. Wind south-southeast around 2 mph, gusting to 19 mph. |
| Wednesday night |
Clear. Low 43°. Wind southeast near calm in the evening, becoming south-southwest after midnight. |
| Thursday |
Sunny. Warm. High 72°. UV index up to 4. Wind east-southeast around 1 mph, gusting to 20 mph. |
| Thursday night |
Clear in the evening, becoming fair after midnight. Patchy light fog after midnight. Low 46°. Wind east around 2 mph. |
| Friday |
Sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Warm. High 76°. Wind southeast around 5 mph, gusting to 22 mph. |
| Friday night |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Low 51°. Wind south-southeast around 5 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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