| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 25-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy. Low 60°. Wind east-southeast around 3 mph, gusting to 23 mph. |
| Tuesday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain. High 76°. UV index up to 5. Wind east-northeast around 4 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Low 61°. Wind east-northeast around 3 mph, gusting to 18 mph. |
| Wednesday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. A slight chance of rain. High 83°. UV index up to 8. Wind north around 4 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Partly cloudy. Patchy light fog after midnight. Low 61°. Wind north-northeast around 3 mph, gusting to 17 mph. |
| Thursday |
Partly to mostly cloudy. Patchy light fog in the morning. High 83°. UV index up to 8. Wind northeast around 5 mph, gusting to 20 mph, in the morning, becoming 8 mph, gusting to 25 mph, in the afternoon. |
| Thursday night |
Partly to mostly cloudy. Patchy light fog after midnight. Low 60°. Wind northeast around 6 mph, gusting to 21 mph. |
| Friday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain. High 81°. UV index up to 8. Wind east around 5 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Partly cloudy. Patchy light fog after midnight. Low 60°. Wind east around 4 mph, gusting to 18 mph. |
| Saturday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 83°. UV index up to 9. Wind east-northeast around 8 mph, gusting to 27 mph. |
| Saturday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 57°. Wind east-northeast around 6 mph, gusting to 24 mph. |
| Sunday |
Sunny. High 73°. UV index up to 10. Wind east-northeast around 8 mph, gusting to 29 mph, in the morning, becoming 12 mph, gusting to 29 mph, in the afternoon. |
| Sunday night |
Clear. Cool. Low 53°. Wind east-northeast around 6 mph, gusting to 25 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.