| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 14-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Sunny in the morning, becoming partly cloudy in the afternoon. High 76°. UV index up to 7. Wind southeast around 6 mph, gusting to 25 mph. |
| Tonight |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. A chance of rain after midnight. Cool. Low 50°. Wind southeast around 8 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Friday |
Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. A chance of rain. Warm. High 83°. UV index up to 7. Wind south-southeast around 9 mph, gusting to 27 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday night |
Fair to partly cloudy. Low 59°. Wind south around 6 mph, gusting to 20 mph. |
| Saturday |
Mostly cloudy. Rain likely. High 78°. UV index up to 6. Wind southwest around 6 mph, gusting to 18 mph. Chance of precipitation 60 percent. Precipitation mostly between a quarter and half an inch. |
| Saturday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 63°. Wind south-southeast around 6 mph, gusting to 15 mph. |
| Sunday |
Partly cloudy. Patchy light fog in the morning. Hot. High 86°. UV index up to 6. Wind south around 10 mph, gusting to 27 mph. |
| Sunday night |
Mostly clear in the evening, becoming partly cloudy after midnight. Low 67°. Wind south around 10 mph, gusting to 23 mph. |
| Monday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Rain likely. Precipitation showery or intermittent. Hot. High 86°. UV index up to 9. Wind south around 11 mph, gusting to 28 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Monday night |
Mostly cloudy. Light to moderate fog. Rain likely in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Warm. Low 72°. Wind south around 9 mph, gusting to 20 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Tuesday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. Warm. High 82°. UV index up to 8. Wind south around 9 mph, gusting to 28 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Mostly cloudy in the evening, becoming cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Warm. Low 71°. Wind east around 6 mph, gusting to 23 mph, in the evening, becoming northeast after midnight. |
| Wednesday |
Dense overcast in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thundershowers possible. High 76°. UV index up to 7. Wind east around 8 mph, gusting to 27 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Cloudy in the evening, becoming dense overcast after midnight. Light to moderate fog. Rain likely. Scattered thundershowers possible. Low 67°. Wind east-southeast around 6 mph, gusting to 23 mph. Chance of precipitation 80 percent. Precipitation mostly between half an inch and one inch. |
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