| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 29-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. Low 67°. Wind east-southeast around 5 mph, gusting to 20 mph. |
| Saturday |
Partly cloudy. Patchy light fog in the morning. Hot. High 86°. UV index up to 8. Wind east-southeast around 6 mph, gusting to 26 mph. |
| Saturday night |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. Low 67°. Wind east-southeast around 7 mph, gusting to 23 mph. |
| Sunday |
Cloudy in the morning, becoming partly 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. Hot. High 85°. UV index up to 8. Wind southeast around 6 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Fair. Patchy light fog after midnight. Low 63°. Wind southeast around 3 mph, gusting to 21 mph, in the evening, becoming northeast after midnight. |
| Monday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. Scattered thunderstorms likely, some possibly severe. Hot. High 86°. UV index up to 7. Wind south-southwest around 3 mph, gusting to 24 mph, in the morning, becoming north-northwest in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 63°. Wind northeast around 4 mph, gusting to 20 mph. |
| Tuesday |
Partly to mostly cloudy. Patchy light fog in the morning. A slight chance of rain in the afternoon. Scattered thundershowers possible. High 85°. UV index up to 7. Wind east-northeast around 7 mph, gusting to 25 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly cloudy. Low 60°. Wind east around 5 mph, gusting to 22 mph. |
| Wednesday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Hot. High 85°. UV index up to 8. Wind southeast around 6 mph, gusting to 25 mph. |
| Wednesday night |
Mostly clear in the evening, becoming fair to partly cloudy after midnight. Relatively cool. Low 58°. Wind southeast around 5 mph, gusting to 22 mph. |
| Thursday |
Partly cloudy. Hot. High 88°. UV index up to 8. Wind south around 4 mph, gusting to 25 mph. |
| Thursday night |
Mostly clear in the evening, becoming mostly cloudy to cloudy after midnight. A slight chance of rain after midnight. Precipitation showery or intermittent. Low 64°. Wind southeast around 5 mph, gusting to 19 mph, in the evening, becoming south after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.