| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 21-May-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Cloudy. Low 63°. Wind east around 6 mph, gusting to 26 mph. |
| Friday |
Dense overcast. A chance of rain. Scattered thundershowers possible. High 71°. Wind east around 6 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly cloudy to cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog after midnight. Low 59°. Wind north-northeast around 4 mph, gusting to 21 mph, in the evening, becoming north-northwest after midnight. |
| Saturday |
Partly to mostly cloudy 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 74°. UV index up to 5. Wind northwest around 3 mph, gusting to 20 mph, in the morning, becoming west in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Light to moderate fog after midnight. A slight chance of rain. Scattered thundershowers possible. Low 60°. Wind north-northwest around 2 mph, gusting to 18 mph, in the evening, becoming southwest after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thundershowers possible. High 78°. UV index up to 6. Wind south around 3 mph, gusting to 22 mph, in the morning, becoming southwest in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Mostly cloudy. Patchy light fog after midnight. Low 63°. Wind east around 3 mph, gusting to 20 mph. |
| Monday |
Mostly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. High 81°. UV index up to 7. Wind east around 5 mph, gusting to 23 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Mostly cloudy. Patchy light fog after midnight. Low 66°. Wind east around 3 mph, gusting to 17 mph. |
| Tuesday |
Cloudy in the morning, becoming mostly cloudy to cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thunderstorms likely. High 76°. UV index up to 5. Wind east around 6 mph, gusting to 19 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Tuesday night |
Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely. Scattered thunderstorms likely. Low 66°. Wind east-southeast around 6 mph, gusting to 17 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Wednesday |
Partly cloudy. Moderate fog in the morning. A slight chance of rain. Scattered thunderstorms likely. Warm. High 83°. UV index up to 10. Wind south-southeast around 6 mph, gusting to 22 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Mostly cloudy. Moderate fog. A slight chance of rain in the evening, then a chance of rain after midnight. Thunderstorms very likely, some severe. Low 68°. Wind east-southeast around 5 mph, gusting to 17 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
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