| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 30-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly 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. Scattered thundershowers possible. Hot. High 86°. UV index up to 5. Wind east-southeast around 3 mph, gusting to 23 mph, in the morning, becoming 7 mph, gusting to 24 mph, in the afternoon. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Tonight |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. A chance of rain. Precipitation showery or intermittent. Low 72°. Wind east-southeast around 6 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Cloudy in the morning, becoming partly to mostly 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 thundershowers possible. Hot. High 86°. UV index up to 7. Wind east-southeast around 6 mph, gusting to 25 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A slight chance of rain. Scattered thundershowers possible. Low 71°. Wind east-southeast around 4 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thunderstorms likely. Hot. High 86°. UV index up to 6. Wind east-northeast around 3 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Fair to partly cloudy in the evening, becoming mostly cloudy after midnight. Low 66°. Wind north-northeast around 4 mph, gusting to 18 mph. |
| Tuesday |
Partly cloudy in the morning, becoming sunny in the afternoon. High 84°. UV index up to 9. Wind east-northeast around 6 mph, gusting to 25 mph. |
| Tuesday night |
Partly cloudy. Low 61°. Wind east around 8 mph, gusting to 24 mph, in the evening, becoming 4 mph after midnight. |
| Wednesday |
Sunny. High 83°. UV index up to 9. Wind east-southeast around 6 mph, gusting to 25 mph. |
| Wednesday night |
Fair. Relatively cool. Low 57°. Wind southeast around 5 mph, gusting to 23 mph. |
| Thursday |
Partly to mostly sunny. Hot. High 86°. UV index up to 9. Wind south around 6 mph, gusting to 25 mph. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Low 64°. Wind south-southeast around 6 mph, gusting to 22 mph. |
| Friday |
Partly to mostly cloudy. Hot. High 90°. UV index up to 8. Wind south-southwest around 8 mph, gusting to 27 mph. |
| Friday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Precipitation showery or intermittent. Low 65°. Wind southwest around 6 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
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