| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 20-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 67°. Wind northeast around 5 mph, gusting to 21 mph, in the evening, becoming east-southeast after midnight. |
| Sunday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Scattered thundershowers possible. High 79°. UV index up to 6. Wind southeast around 9 mph, gusting to 22 mph, in the morning, becoming south-southwest in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Sunday night |
Mostly cloudy. Patchy light fog. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Low 67°. Wind northwest around 8 mph, gusting to 20 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Monday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 77°. UV index up to 6. Wind north-northeast around 7 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Relatively cool. Low 62°. Wind north-northeast around 4 mph, gusting to 22 mph, in the evening, becoming east-northeast after midnight. |
| Tuesday |
Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. High 82°. UV index up to 7. Wind east-northeast around 5 mph, gusting to 23 mph. |
| Tuesday night |
Mostly clear in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 59°. Wind east-northeast around 4 mph, gusting to 22 mph. |
| Wednesday |
Mostly cloudy to cloudy in the morning, becoming cloudy in the afternoon. Rain likely. Scattered thundershowers possible. High 76°. UV index up to 4. Wind south-southeast around 3 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Wednesday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Scattered thundershowers possible. Relatively cool. Low 65°. Wind southeast around 2 mph in the evening, becoming west-northwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Precipitation showery or intermittent. High 82°. UV index up to 6. Wind north-northwest around 4 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Mostly clear in the evening, becoming clear after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Relatively cool. Low 63°. Wind north-northeast around 2 mph, gusting to 15 mph. |
| Friday |
Mostly sunny in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the afternoon. Scattered thundershowers possible. High 84°. UV index up to 7. Wind east-northeast around 6 mph, gusting to 23 mph, in the morning, becoming east-southeast in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 70°. Wind southeast around 6 mph, gusting to 18 mph, in the evening, becoming south after midnight. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
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