| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Monday, 29-Jun-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Very hot. High 97°. Heat index up to 106°. UV index up to 10. Wind south-southeast around 7 mph, gusting to 28 mph, in the morning, becoming 10 mph, gusting to 28 mph, in the afternoon. |
| Tonight |
Partly cloudy. Low 75°. Wind south around 7 mph, gusting to 25 mph. |
| Tuesday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Very hot. High 99°. Heat index up to 109°. UV index up to 9. Wind south-southwest around 7 mph, gusting to 26 mph. |
| Tuesday night |
Clear. Patchy light fog after midnight. Low 73°. Wind south-southwest around 5 mph, gusting to 21 mph. |
| Wednesday |
Sunny. Patchy light fog in the morning. Very hot. High 98°. Heat index up to 108°. UV index up to 9. Wind south-southwest around 6 mph, gusting to 25 mph. |
| Wednesday night |
Fair to partly cloudy. Patchy light fog after midnight. Low 73°. Wind south-southwest around 5 mph, gusting to 20 mph. |
| Thursday |
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. Very hot. High 96°. Heat index up to 106°. UV index up to 10. Wind south-southwest around 6 mph, gusting to 24 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Low 75°. Wind southeast around 5 mph, gusting to 15 mph, in the evening, becoming south-southwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Partly 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. Scattered thunderstorms likely. Hot. High 94°. Heat index up to 106°. UV index up to 8. Wind south-southwest around 5 mph, gusting to 22 mph, in the morning, becoming south-southeast in the afternoon. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday night |
Partly cloudy in the evening, becoming mostly clear after midnight. Moderate fog in the evening, then moderate to dense fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 75°. Wind south around 4 mph. Chance of precipitation 40 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. Hot. High 93°. Heat index up to 105°. UV index up to 8. Wind south around 4 mph, gusting to 21 mph. |
| Saturday night |
Fair in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. Low 75°. Wind south-southwest around 3 mph. |
| Sunday |
Sunny in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. Hot. High 95°. Heat index up to 108°. UV index up to 10. Wind west-northwest around 5 mph, gusting to 22 mph. |
| Sunday night |
Partly cloudy in the evening, becoming cloudy after midnight. Moderate fog in the evening, then light to moderate fog after midnight. Rain likely. Thunderstorms very likely, some possibly severe. Low 76°. Wind west-southwest around 4 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
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