| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 29-Mar-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog after midnight. Low 49°. Wind south-southeast around 9 mph, gusting to 27 mph. |
| Monday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Breezy and unusually hot. High 83°. UV index up to 7. Wind south-southwest around 11 mph, gusting to 29 mph. |
| Monday night |
Partly cloudy. Mild. Low 60°. Wind south-southwest around 10 mph, gusting to 23 mph. |
| Tuesday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. A chance of rain. Scattered thundershowers possible. Breezy and exceptionally hot. High 87°. UV index up to 5. Wind south-southwest around 12 mph, gusting to 31 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly to mostly cloudy in the evening, becoming cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely. Scattered thundershowers possible. Mild. Low 57°. Wind west around 6 mph, gusting to 19 mph, in the evening, becoming north after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday |
Dense overcast. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain likely. Precipitation showery or intermittent. High 63°. Wind east-northeast around 4 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday night |
Cloudy in the evening, becoming dense overcast after midnight. Light to moderate fog. A chance of rain in the evening, then rain likely after midnight. Scattered thundershowers possible. Mild. Low 58°. Wind east around 5 mph in the evening, becoming south-southwest after midnight. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Thursday |
Dense overcast in the morning, becoming cloudy in the afternoon. Patchy light fog in the morning, then light to moderate fog in the afternoon. Rain very likely. Scattered thunderstorms likely. Mild. High 68°. Wind south-southwest around 11 mph, gusting to 23 mph. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Thursday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Moderate fog in the evening, then light to moderate fog after midnight. Rain likely. Scattered thundershowers possible. Mild. Low 55°. Wind west-southwest around 6 mph, gusting to 16 mph, in the evening, becoming north after midnight. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Friday |
Cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog. A chance of rain. Mild. High 72°. UV index up to 5. Wind northeast around 4 mph, gusting to 19 mph, in the morning, becoming southeast in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Mild. Low 63°. Wind southeast around 9 mph, gusting to 18 mph, in the evening, becoming south after midnight. Chance of precipitation 80 percent. Precipitation mostly around an inch. |
| Saturday |
Cloudy in the morning, becoming partly to 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 66°, but temperatures falling in the afternoon. UV index up to 7. Wind west-northwest around 10 mph, gusting to 28 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Mostly clear. Patchy light fog after midnight. Low 46°. Wind northwest around 7 mph, gusting to 25 mph. |
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