| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 17-Sep-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Clear. Low 65°. Wind northeast around 2 mph, gusting to 22 mph, in the evening, becoming southeast after midnight. |
| Thursday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Very hot. High 95°. UV index up to 6. Wind south-southeast around 3 mph, gusting to 21 mph. |
| Thursday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. A slight chance of rain. Precipitation showery or intermittent. Low 66°. Wind northwest around 3 mph in the evening, becoming east after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Mostly cloudy to cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thundershowers possible. Hot. High 86°. UV index up to 5. Wind south-southwest near calm in the morning, becoming 5 mph, gusting to 23 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Fair to partly cloudy. Low 65°. Wind southwest around 2 mph, gusting to 20 mph. |
| Saturday |
Partly cloudy. A chance of rain. Hot. High 87°. UV index up to 5. Wind south-southwest around 3 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Scattered thundershowers possible. Warm. Low 70°. Wind south-southwest around 5 mph, gusting to 20 mph. Chance of precipitation 70 percent. Precipitation mostly between half an inch and one inch. |
| Sunday |
Cloudy. Light to moderate fog in the morning. A chance of rain. Scattered thunderstorms likely. Warm. High 84°. Wind south-southwest around 6 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Sunday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog after midnight. Rain likely. Scattered thundershowers possible. Warm. Low 71°. Wind south around 4 mph, gusting to 21 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Monday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Light to moderate fog in the morning. Rain likely. Scattered thundershowers possible. Warm. High 82°. Wind south-southeast around 6 mph, gusting to 22 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Monday night |
Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Light to moderate fog. Rain likely. Scattered thunderstorms likely. Warm. Low 72°. Wind south around 4 mph, gusting to 17 mph, in the evening, becoming 7 mph, gusting to 20 mph, after midnight. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Tuesday |
Dense overcast in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. Scattered thunderstorms likely. High 77°. Wind south-southwest around 3 mph, gusting to 18 mph, in the morning, becoming northeast in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming fair after midnight. Moderate fog after midnight. Low 66°. Wind south-southeast around 3 mph. |
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