| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Sunday, 31-May-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Cloudy in the morning, becoming partly cloudy in the afternoon. A slight chance of rain. Scattered thunderstorms likely. Hot. High 86°. UV index up to 9. Wind east-southeast around 5 mph, gusting to 26 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Fair to partly cloudy. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely. Low 64°. Wind east-southeast around 3 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Monday |
Partly cloudy in the morning, becoming mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thunderstorms likely, some possibly severe. High 85°. UV index up to 6. Wind east around 5 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Low 64°. Wind northeast around 5 mph, gusting to 20 mph. |
| Tuesday |
Partly cloudy in the morning, becoming sunny in the afternoon. High 82°. UV index up to 8. Wind northeast around 8 mph, gusting to 27 mph. |
| Tuesday night |
Clear. Relatively cool. Low 57°. Wind east around 5 mph, gusting to 23 mph. |
| Wednesday |
Mostly sunny in the morning, becoming sunny in the afternoon. High 82°. UV index up to 9. Wind east around 6 mph, gusting to 26 mph. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Relatively cool. Low 57°. Wind east-southeast around 4 mph, gusting to 22 mph, in the evening, becoming south-southeast after midnight. |
| Thursday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Hot. High 86°. UV index up to 7. Wind south around 6 mph, gusting to 26 mph. |
| Thursday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Low 62°. Wind south around 6 mph, gusting to 21 mph. |
| Friday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. Rain likely. Scattered thunderstorms likely. High 81°. UV index up to 6. Wind south-southwest around 8 mph, gusting to 24 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Friday night |
Dense overcast in the evening, becoming cloudy after midnight. Light to moderate fog. Rain likely. Scattered thunderstorms likely. Low 69°. Wind south around 6 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Saturday |
Mostly cloudy in the morning, becoming cloudy in the afternoon. Moderate fog in the morning. Rain likely. Thunderstorms very likely, some possibly severe. High 82°. UV index up to 6. Wind southwest around 7 mph, gusting to 20 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Saturday night |
Cloudy in the evening, becoming dense overcast after midnight. Light to moderate fog. A chance of rain in the evening, then rain likely after midnight. Thunderstorms very likely, some possibly severe. Low 72°. Wind south-southeast around 5 mph. Chance of precipitation 80 percent. Precipitation mostly around half an inch. |
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