| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 22-Oct-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair. Low 49°. Wind east-southeast near calm. |
| Friday |
Mostly sunny. Warm. High 76°. UV index up to 4. Wind east-southeast around 4 mph, gusting to 23 mph. |
| Friday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Low 48°. Wind east-southeast around 4 mph. |
| Saturday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Warm. High 76°. Wind south-southeast around 4 mph, gusting to 22 mph. |
| Saturday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 48°. Wind south-southeast around 3 mph. |
| Sunday |
Partly cloudy. Warm. High 77°. UV index up to 4. Wind south-southeast around 2 mph, gusting to 19 mph. |
| Sunday night |
Partly cloudy. Low 49°. Wind south-southeast around 2 mph. |
| Monday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Warm. High 75°. Wind south around 2 mph, gusting to 18 mph. |
| Monday night |
Partly cloudy. Low 48°. Wind southeast around 2 mph. |
| Tuesday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Warm. High 74°. Wind south-southeast around 2 mph, gusting to 18 mph. |
| Tuesday night |
Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 48°. Wind south around 3 mph. |
| Wednesday |
Partly to mostly sunny in the morning, becoming sunny in the afternoon. Warm. High 73°. Wind west around 5 mph, gusting to 26 mph. |
| Wednesday night |
Fair in the evening, becoming partly cloudy after midnight. Low 48°. Wind southwest near calm. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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