| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 07-Jun-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Moderate fog. Rain likely. Scattered thundershowers possible. Low 63°. Wind north-northwest around 5 mph, gusting to 18 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Sunday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate to dense fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. High 81°. UV index up to 10. Wind west-northwest around 7 mph, gusting to 25 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Sunday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely. Scattered thunderstorms likely. Relatively cool. Low 62°. Wind west-northwest around 5 mph, gusting to 19 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Monday |
Mostly sunny in the morning, becoming sunny in the afternoon. Moderate fog in the morning. A chance of rain. High 80°. UV index up to 10. Wind west-southwest around 6 mph, gusting to 25 mph, in the morning, becoming 11 mph, gusting to 28 mph, in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Clear. Patchy light fog after midnight. Relatively cool. Low 58°. Wind west-northwest around 5 mph, gusting to 25 mph. |
| Tuesday |
Sunny. Patchy light fog in the morning. High 81°. UV index up to 10. Wind west-northwest around 6 mph, gusting to 26 mph. |
| Tuesday night |
Clear. Patchy light fog after midnight. Relatively cool. Low 59°. Wind southwest around 3 mph, gusting to 20 mph. |
| Wednesday |
Sunny in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. Hot. High 88°. UV index up to 9. Wind south-southwest around 6 mph, gusting to 25 mph. |
| Wednesday night |
Partly to mostly cloudy. Low 66°. Wind south-southeast around 4 mph, gusting to 19 mph. |
| Thursday |
Partly to mostly cloudy. A chance of rain. Scattered thundershowers possible. High 86°. UV index up to 8. Wind south around 5 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 69°. Wind southeast around 5 mph, gusting to 20 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. Rain likely. Thunderstorms very likely, some possibly severe. High 80°. UV index up to 7. Wind south around 5 mph, gusting to 18 mph, in the morning, becoming southwest around 10 mph, gusting to 25 mph, in the afternoon. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Friday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Thunderstorms very likely, some possibly severe. Low 72°. Wind west-southwest around 6 mph, gusting to 20 mph. Chance of precipitation 80 percent. Precipitation mostly between a quarter and half an inch. |
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