| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 04-Jun-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog. Rain likely in the evening, then a slight chance of rain after midnight. Scattered thundershowers possible. Low 65°. Wind north around 3 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Thursday |
Mostly cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. A slight chance of rain. Scattered thundershowers possible. High 80°. UV index up to 5. Wind north around 5 mph, gusting to 24 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Relatively cool. Low 61°. Wind northeast around 2 mph, gusting to 20 mph. |
| Friday |
Cloudy in the morning, becoming mostly cloudy in the afternoon. Moderate fog in the afternoon. A chance of rain in the morning, then rain likely in the afternoon. Precipitation showery or intermittent. Cool. High 71°. UV index up to 6. Wind east around 3 mph in the morning, becoming north in the afternoon. Chance of precipitation 70 percent. Precipitation mostly between half an inch and one inch. |
| Friday night |
Mostly clear in the evening, becoming fair to partly cloudy after midnight. Patchy light fog. Relatively cool. Low 59°. Wind north around 2 mph. |
| Saturday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain. Scattered thundershowers possible. High 79°. UV index up to 10. Wind north-northeast around 4 mph, gusting to 21 mph, in the morning, becoming north-northwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Mostly clear. Patchy light fog after midnight. Relatively cool. Low 60°. Wind north around 2 mph, gusting to 20 mph, in the evening, becoming southwest after midnight. |
| Sunday |
Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. High 83°. UV index up to 10. Wind west around 5 mph, gusting to 26 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. |
| Sunday night |
Fair. Patchy light fog after midnight. Relatively cool. Low 60°. Wind west around 5 mph, gusting to 22 mph. |
| Monday |
Sunny in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. High 83°. UV index up to 10. Wind west around 6 mph, gusting to 25 mph, in the morning, becoming 9 mph, gusting to 26 mph, in the afternoon. |
| Monday night |
Fair in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Relatively cool. Low 60°. Wind west around 4 mph, gusting to 22 mph, in the evening, becoming north-northwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. High 79°. UV index up to 7. Wind north-northeast around 5 mph, gusting to 26 mph. |
| Tuesday night |
Clear. Relatively cool. Low 59°. Wind north around 3 mph, gusting to 20 mph, in the evening, becoming east after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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