| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 16-May-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Clear. Patchy light fog after midnight. Relatively cool. Low 56°. Wind southwest around 11 mph, gusting to 24 mph, in the evening, becoming west after midnight. |
| Saturday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Breezy. High 74°. UV index up to 8. Wind west around 12 mph, gusting to 30 mph. |
| Saturday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Cool. Low 48°. Wind west around 4 mph, gusting to 24 mph, in the evening, becoming northwest after midnight. |
| Sunday |
Sunny in the morning, becoming mostly sunny in the afternoon. High 81°. UV index up to 10. Wind northeast around 6 mph, gusting to 25 mph, in the morning, becoming east-southeast in the afternoon. |
| Sunday night |
Partly cloudy in the evening, becoming cloudy after midnight. Patchy light fog after midnight. A chance of rain in the evening, then rain likely after midnight. Precipitation showery or intermittent. Low 59°. Wind east-southeast around 8 mph, gusting to 23 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
| Monday |
Cloudy. Patchy light fog in the morning. Rain. Scattered thundershowers possible. High 72°. UV index up to 5. Wind east-southeast around 9 mph, gusting to 21 mph. Chance of precipitation near 100 percent. Precipitation mostly between half an inch and one inch. |
| Monday night |
Dense overcast in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Rain. Scattered thunderstorms likely. Low 64°. Wind east-southeast around 9 mph, gusting to 18 mph. Chance of precipitation near 100 percent. Precipitation mostly between 1 and 2 inches. |
| Tuesday |
Mostly cloudy. Moderate fog in the morning. A chance of rain in the morning, then rain likely in the afternoon. Scattered thunderstorms likely. High 76°. UV index up to 7. Wind south-southwest around 8 mph, gusting to 20 mph. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Moderate fog. Rain likely in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 58°. Wind west-northwest around 6 mph, gusting to 18 mph. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. Rain likely. Cool. High 62°. UV index up to 6. Wind northwest around 11 mph, gusting to 27 mph. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Light to moderate fog. A chance of rain. Cool. Low 50°. Wind northwest around 7 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Thursday |
Sunny. Light to moderate fog in the morning. High 70°. UV index up to 10. Wind northwest around 6 mph, gusting to 25 mph. |
| Thursday night |
Clear. Cool. Low 49°. Wind north around 3 mph, gusting to 20 mph, in the evening, becoming south after midnight. |
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