| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 20-Jun-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Clear. Patchy light fog in the evening, then moderate fog after midnight. Low 74°. Wind south around 8 mph, gusting to 23 mph. |
| Saturday |
Sunny. Moderate fog in the morning. Hot. High 93°. Heat index up to 102°. UV index up to 10. Wind south around 11 mph, gusting to 28 mph. |
| Saturday night |
Clear. Patchy light fog in the evening, then moderate fog after midnight. Low 77°. Wind south around 8 mph, gusting to 24 mph. |
| Sunday |
Sunny. Moderate fog in the morning. Very hot. High 96°. Heat index up to 109°. UV index up to 10. Wind south-southwest around 9 mph, gusting to 27 mph. |
| Sunday night |
Clear. Moderate fog after midnight. Low 76°. Wind south-southwest around 6 mph, gusting to 22 mph. |
| Monday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. Very hot. High 97°. Heat index up to 109°. UV index up to 10. Wind south-southwest around 6 mph, gusting to 25 mph. |
| Monday night |
Partly cloudy. Patchy light fog in the evening, then moderate fog after midnight. Rain likely. Scattered thundershowers possible. Low 76°. Wind south around 5 mph, gusting to 21 mph. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Tuesday |
Partly to mostly cloudy. Light to moderate fog in the morning. Rain likely. Scattered thunderstorms likely. Hot. High 90°. Heat index up to 102°. UV index up to 7. Wind south around 3 mph, gusting to 17 mph. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch. |
| Tuesday night |
Moderate fog. Rain likely. Scattered thunderstorms likely. Low 77°. Wind south around 4 mph. Chance of precipitation 70 percent. Precipitation mostly less than a quarter of an inch. |
| Wednesday |
Partly to mostly sunny in the morning, becoming partly 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. Hot. High 94°. Heat index up to 106°. UV index up to 9. Wind southwest around 5 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Moderate fog in the evening, then moderate to dense fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 76°. Wind southwest around 5 mph, gusting to 16 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Moderate fog in the morning. A chance of rain in the afternoon. Scattered thunderstorms likely, some possibly severe. Hot. High 95°. Heat index up to 109°. UV index up to 9. Wind southwest around 4 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly to mostly 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. Thunderstorms very likely, some severe. Low 75°. Wind southeast around 4 mph in the evening, becoming southwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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