| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 23-Jun-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair to partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thunderstorms likely, some possibly severe. Low 75°. Wind south-southwest around 4 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Hot. High 95°. Heat index up to 104°. UV index up to 9. Wind southwest around 5 mph, gusting to 24 mph. |
| Tuesday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog after midnight. Low 73°. Wind south around 4 mph, gusting to 20 mph. |
| Wednesday |
Partly cloudy. Patchy light 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 92°. Heat index up to 101°. UV index up to 9. Wind south-southwest around 5 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 74°. Wind southwest around 4 mph, gusting to 17 mph. |
| Thursday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. A chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. Hot. High 95°. Heat index up to 105°. UV index up to 10. Wind southwest around 5 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Moderate fog. A chance of rain. Thunderstorms very likely, some possibly severe. Low 74°. Wind south around 5 mph, gusting to 15 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Partly cloudy. Moderate fog in the morning. Hot. High 94°. Heat index up to 104°. UV index up to 8. Wind southwest around 7 mph, gusting to 25 mph. |
| Friday night |
Partly to mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Light to moderate fog after midnight. Low 75°. Wind southwest around 4 mph, gusting to 20 mph. |
| Saturday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. 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 9. Wind southwest around 6 mph, gusting to 26 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 75°. Wind south-southwest around 4 mph, gusting to 17 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. Very hot. High 96°. Heat index up to 108°. UV index up to 9. Wind southwest around 5 mph, gusting to 23 mph. |
| Sunday night |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Low 76°. Wind southwest around 4 mph, gusting to 18 mph. |
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