| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 09-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly sunny. Warm. High 80°. UV index up to 7. Wind west-southwest around 9 mph, gusting to 28 mph. |
| Tonight |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain. Low 56°. Wind southwest around 6 mph, gusting to 20 mph, in the evening, becoming north after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. High 72°. UV index up to 6. Wind north around 8 mph, gusting to 27 mph. |
| Sunday night |
Partly cloudy. Cool. Low 47°. Wind north around 2 mph, gusting to 23 mph, in the evening, becoming northeast after midnight. |
| Monday |
Sunny. High 73°. UV index up to 7. Wind west around 3 mph, gusting to 24 mph, in the morning, becoming 6 mph, gusting to 24 mph, in the afternoon. |
| Monday night |
Fair in the evening, becoming clear after midnight. Cool. Low 47°. Wind south-southwest around 5 mph, gusting to 19 mph. |
| Tuesday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Warm. High 80°. UV index up to 8. Wind south-southwest around 8 mph, gusting to 28 mph, in the morning, becoming 11 mph, gusting to 29 mph, in the afternoon. |
| Tuesday night |
Partly cloudy in the evening, becoming mostly clear after midnight. A chance of rain. Cool. Low 52°. Wind west around 8 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Wednesday |
Sunny. High 74°. UV index up to 7. Wind northwest around 9 mph, gusting to 29 mph, in the morning, becoming 13 mph, gusting to 30 mph, in the afternoon. |
| Wednesday night |
Clear. Cool. Low 47°. Wind north around 7 mph, gusting to 27 mph, in the evening, becoming 3 mph after midnight. |
| Thursday |
Sunny in the morning, becoming mostly sunny in the afternoon. High 76°. UV index up to 8. Wind east-northeast around 6 mph, gusting to 26 mph. |
| Thursday night |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Cool. Low 53°. Wind south-southeast around 9 mph, gusting to 21 mph. |
| Friday |
Partly to mostly cloudy in the morning, becoming sunny in the afternoon. Unusually hot. High 88°. UV index up to 10. Wind southwest around 10 mph, gusting to 29 mph. |
| Friday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Low 58°. Wind southwest around 6 mph, gusting to 22 mph. |
WXSIM forecast formatting script by Saratoga-Weather.org.