| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 29-Oct-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Exceptionally hot. High 86°. Wind south-southwest around 4 mph, gusting to 26 mph, in the morning, becoming west in the afternoon. |
| Tonight |
Partly cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain. Mild. Low 62°. Wind north-northeast around 3 mph, gusting to 16 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. A slight chance of rain. Unusually warm. High 76°. Wind east-southeast around 5 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Mild. Low 62°. Wind southeast around 4 mph, gusting to 18 mph. |
| Saturday |
Cloudy. Unusually warm. High 75°. Wind east around 3 mph, gusting to 21 mph. |
| Saturday night |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Mild. Low 59°. Wind east around 4 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Sunday |
Dense overcast in the morning, becoming cloudy in the afternoon. A chance of rain in the morning, then a slight chance of rain in the afternoon. Mild. High 68°. Wind southeast around 4 mph, gusting to 20 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Mostly cloudy to cloudy in the evening, becoming cloudy after midnight. Mild. Low 61°. Wind southeast around 5 mph, gusting to 18 mph. |
| Monday |
Dense overcast. A slight chance of rain. Mild. High 68°. Wind southeast around 7 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Cloudy. A chance of rain. Mild. Low 61°. Wind south-southeast around 10 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Tuesday |
Dense overcast in the morning, becoming cloudy in the afternoon. Rain likely in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. Breezy and mild. High 68°. Wind south-southeast around 12 mph, gusting to 22 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
| Tuesday night |
Dense overcast in the evening, becoming cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Rain very likely. Scattered thundershowers possible. Mild. Low 61°. Wind south-southeast around 11 mph, gusting to 21 mph, in the evening, becoming south-southwest after midnight. Chance of precipitation 80 percent. Precipitation mostly between 1 and 2 inches. |
| Wednesday |
Cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog. A chance of rain. Precipitation showery or intermittent. High 63°. Wind southwest around 7 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Cloudy in the evening, becoming mostly cloudy after midnight. A slight chance of rain in the evening. Low 50°. Wind west-northwest around 10 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
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