| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 24-Sep-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Warm. High 78°. UV index up to 6. Wind north-northeast around 4 mph, gusting to 25 mph. |
| Tonight |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 57°. Wind north-northeast around 2 mph, gusting to 19 mph. |
| Friday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. High 73°. Wind east around 4 mph, gusting to 20 mph. |
| Friday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 58°. Wind east around 4 mph, gusting to 17 mph. |
| Saturday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. High 71°. Wind east around 4 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday night |
Mostly cloudy. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 58°. Wind east-southeast around 4 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. High 76°. UV index up to 5. Wind east-southeast around 3 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Partly cloudy. Patchy light fog after midnight. Low 56°. Wind east around 2 mph, gusting to 16 mph. |
| Monday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. High 77°. UV index up to 5. Wind east-southeast around 4 mph, gusting to 21 mph. |
| Monday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain after midnight. Low 59°. Wind east-southeast around 4 mph, gusting to 15 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Partly to mostly cloudy in the morning, becoming mostly cloudy in the afternoon. Light to moderate fog in the morning. Rain likely. High 74°. UV index up to 5. Wind east-southeast around 6 mph, gusting to 18 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Tuesday night |
Dense overcast. Light to moderate fog in the evening, then patchy light fog after midnight. Rain very likely. Scattered thundershowers possible. Low 65°, but temperatures rising after midnight. Wind south around 8 mph, gusting to 19 mph, in the evening, becoming southwest around 12 mph, gusting to 22 mph, after midnight. Chance of precipitation 90 percent. Precipitation mostly between 2 and 3 inches. |
| Wednesday |
Cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thundershowers possible. Breezy. High 69°. UV index up to 4. Wind west-northwest around 12 mph, gusting to 29 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Clear. Patchy light fog in the evening, then light to moderate fog after midnight. Low 54°. Wind west around 5 mph, gusting to 21 mph. |
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