| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 02-Jul-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly to mostly cloudy in the evening, becoming fair after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Scattered thunderstorms likely, some possibly severe. Low 75°. Wind south-southwest around 4 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Sunny in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely, some possibly severe. Hot. High 95°. Heat index up to 106°. UV index up to 8. Wind south around 5 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Moderate fog. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Low 75°. Wind southeast around 4 mph, gusting to 19 mph, in the evening, becoming southwest after midnight. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Saturday |
Partly cloudy. Moderate fog in the morning. A slight chance of rain in the morning, then rain likely in the afternoon. Thunderstorms very likely, some possibly severe. Hot. High 94°. Heat index up to 105°. UV index up to 10. Wind southwest around 5 mph, gusting to 23 mph, in the morning, becoming west in the afternoon. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday night |
Moderate fog. Rain likely in the evening, then a chance of rain after midnight. Scattered thunderstorms likely, some possibly severe. Low 75°. Wind south around 4 mph in the evening, becoming west after midnight. Chance of precipitation 80 percent. Precipitation mostly around a quarter of an inch. |
| Sunday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. A chance of rain. Scattered thunderstorms likely. High 90°. Heat index up to 99°. UV index up to 10. Wind west-southwest around 3 mph, gusting to 22 mph, in the morning, becoming northwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Fair in the evening, becoming fair to partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 72°. Wind north around 3 mph, gusting to 19 mph. |
| Monday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. High 88°. Heat index up to 95°. UV index up to 8. Wind north-northeast around 4 mph, gusting to 23 mph. |
| Monday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 70°. Wind north-northeast around 3 mph, gusting to 22 mph. |
| Tuesday |
Partly cloudy. Patchy light fog in the morning. A chance of rain. High 86°. UV index up to 8. Wind north around 5 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Clear in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. Low 69°. Wind north around 2 mph, gusting to 21 mph, in the evening, becoming northeast after midnight. |
| Wednesday |
Mostly sunny in the morning, becoming sunny in the afternoon. Patchy light fog in the morning. Hot. High 90°. Heat index up to 97°. UV index up to 10. Wind east-southeast around 4 mph, gusting to 23 mph. |
| Wednesday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Light to moderate fog after midnight. A chance of rain after midnight. Scattered thunderstorms likely. Low 71°. Wind south-southeast around 8 mph, gusting to 21 mph. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
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