| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 26-Mar-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain. Low 44°. Wind northeast around 3 mph, gusting to 22 mph, in the evening, becoming southeast after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain. High 59°. Wind southeast around 8 mph, gusting to 19 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. A chance of rain. Low 49°. Wind southeast around 6 mph in the evening, becoming south-southwest after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday |
Partly cloudy. Breezy and unusually warm. High 78°. UV index up to 6. Wind south-southwest around 9 mph, gusting to 25 mph, in the morning, becoming 15 mph, gusting to 31 mph, in the afternoon. |
| Friday night |
Mostly cloudy in the evening, becoming partly cloudy after midnight. Mild. Low 60°. Wind south-southwest around 12 mph, gusting to 26 mph, in the evening, becoming 8 mph, gusting to 18 mph, after midnight. |
| Saturday |
Mostly cloudy in the morning, becoming dense overcast in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. Warm. High 73°. Wind south-southwest around 9 mph, gusting to 27 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Saturday night |
Mostly cloudy to cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Mild. Low 61°. Wind south around 7 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog. Rain likely. Thunderstorms very likely, some possibly severe. High 65°. Wind south-southwest around 7 mph, gusting to 17 mph. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Moderate fog in the evening, then patchy light fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Low 47°. Wind northwest around 10 mph, gusting to 28 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Monday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning. Breezy. High 50°. UV index up to 4. Wind northwest around 12 mph, gusting to 29 mph. |
| Monday night |
Mostly cloudy in the evening, becoming fair after midnight. Low 37°. Wind north-northwest around 5 mph, gusting to 24 mph, in the evening, becoming north-northeast around 2 mph after midnight. |
| Tuesday |
Partly to mostly sunny in the morning, becoming partly to mostly cloudy in the afternoon. High 57°. UV index up to 6. Wind east around 5 mph, gusting to 25 mph, in the morning, becoming 8 mph, gusting to 26 mph, in the afternoon. |
| Tuesday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Low 43°. Wind southeast around 7 mph, gusting to 23 mph. |
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