| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 28-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy. Hot. High 87°. UV index up to 9. Wind east-northeast around 5 mph, gusting to 25 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. |
| Tonight |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 61°. Wind east-northeast around 6 mph, gusting to 23 mph. |
| Friday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. High 81°. UV index up to 5. Wind east-northeast around 6 mph, gusting to 23 mph. |
| Friday night |
Dense overcast in the evening, becoming cloudy after midnight. A chance of rain. Precipitation showery or intermittent. Low 64°. Wind east-southeast around 5 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain. Precipitation showery or intermittent. High 82°. UV index up to 8. Wind east around 4 mph, gusting to 19 mph, in the morning, becoming 7 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Low 62°. Wind east around 6 mph, gusting to 23 mph. |
| Sunday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. Hot. High 86°. UV index up to 7. Wind east-southeast around 6 mph, gusting to 25 mph. |
| Sunday night |
Fair to partly cloudy in the evening, becoming mostly clear after midnight. Relatively cool. Low 59°. Wind east-southeast around 5 mph, gusting to 23 mph. |
| Monday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Hot. High 89°. UV index up to 7. Wind south-southeast around 3 mph, gusting to 28 mph, in the morning, becoming northeast in the afternoon. |
| Monday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 58°. Wind northeast around 3 mph, gusting to 19 mph. |
| Tuesday |
Sunny in the morning, becoming partly cloudy in the afternoon. Hot. High 86°. UV index up to 8. Wind northeast around 6 mph, gusting to 24 mph. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Relatively cool. Low 59°. Wind east around 6 mph, gusting to 22 mph. |
| Wednesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Hot. High 87°. UV index up to 10. Wind east-southeast around 7 mph, gusting to 26 mph. |
| Wednesday night |
Mostly clear. Relatively cool. Low 58°. Wind east-southeast around 7 mph, gusting to 24 mph, in the evening, becoming south-southeast after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.