| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 14-May-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 66°. Wind southeast around 7 mph, gusting to 25 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. Very hot. High 91°. UV index up to 9. Wind south around 9 mph, gusting to 28 mph, in the morning, becoming southwest around 13 mph, gusting to 30 mph, in the afternoon. |
| Thursday night |
Partly cloudy in the evening, becoming clear after midnight. Low 58°. Wind west-southwest around 8 mph, gusting to 24 mph. |
| Friday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Unusually hot. High 89°. UV index up to 9. Wind south-southwest around 8 mph, gusting to 27 mph, in the morning, becoming 11 mph, gusting to 29 mph, in the afternoon. |
| Friday night |
Clear. Low 58°. Wind southwest around 7 mph, gusting to 25 mph. |
| Saturday |
Partly cloudy in the morning, becoming sunny in the afternoon. Warm. High 81°. UV index up to 10. Wind west-southwest around 10 mph, gusting to 29 mph. |
| Saturday night |
Mostly clear in the evening, becoming partly cloudy after midnight. Low 54°. Wind west-southwest around 5 mph, gusting to 23 mph, in the evening, becoming north after midnight. |
| Sunday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. Warm. High 82°. UV index up to 10. Wind east-northeast around 7 mph, gusting to 27 mph. |
| Sunday night |
Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog after midnight. A chance of rain in the evening, then rain likely after midnight. Low 56°. Wind east around 7 mph, gusting to 24 mph. Chance of precipitation near 100 percent. Precipitation mostly between half an inch and one inch. |
| Monday |
Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Rain likely. Precipitation showery or intermittent. High 77°. UV index up to 8. Wind east around 10 mph, gusting to 28 mph. Chance of precipitation 60 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Patchy light fog. Rain. Scattered thundershowers possible. Low 57°. Wind east around 10 mph, gusting to 24 mph. Chance of precipitation near 100 percent. Precipitation mostly between half an inch and one inch. |
| Tuesday |
Cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Rain likely in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. Hot. High 88°. UV index up to 10. Wind southeast around 7 mph, gusting to 20 mph, in the morning, becoming 14 mph, gusting to 30 mph, in the afternoon. Chance of precipitation 80 percent. Precipitation mostly between a quarter and half an inch. |
| Tuesday night |
Partly cloudy in the evening, becoming fair after midnight. Light to moderate fog. Rain likely. Scattered thunderstorms likely. Breezy. Low 61°. Wind south-southwest around 15 mph, gusting to 27 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
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