| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 19-Jul-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Moderate to dense fog in the evening, then moderate fog after midnight. Low 74°. Wind south-southwest around 4 mph. |
| Sunday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. High 89°. Heat index up to 98°. UV index up to 10. Wind south-southwest around 7 mph, gusting to 24 mph. |
| Sunday night |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Moderate to dense fog. Rain likely in the evening, then a chance of rain after midnight. Low 74°. Wind southeast around 5 mph, gusting to 16 mph, in the evening, becoming west-southwest after midnight. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Monday |
Partly cloudy. Light to moderate fog in the morning. A chance of rain. Precipitation showery or intermittent. High 88°. Heat index up to 96°. UV index up to 9. Wind west-southwest around 3 mph, gusting to 18 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Fair in the evening, becoming mostly clear after midnight. Moderate fog in the evening, then moderate to dense fog after midnight. Low 73°. Wind east around 4 mph. |
| Tuesday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Moderate fog in the morning. Hot. High 91°. Heat index up to 101°. UV index up to 10. Wind east-southeast around 4 mph, gusting to 19 mph. |
| Tuesday night |
Fair to partly cloudy. Moderate fog. A slight chance of rain in the evening. Precipitation showery or intermittent. Low 76°. Wind east-southeast around 5 mph, gusting to 15 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Mostly sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. Hot. High 92°. Heat index up to 105°. UV index up to 9. Wind south around 4 mph, gusting to 16 mph. |
| Wednesday night |
Clear. Moderate fog. Low 77°. Wind south around 5 mph. |
| Thursday |
Sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. A slight chance of rain in the afternoon. Precipitation showery or intermittent. Hot. High 92°. Heat index up to 106°. UV index up to 9. Wind south around 5 mph, gusting to 18 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly cloudy. Moderate fog in the evening, then moderate to dense fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Low 76°. Wind south around 5 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Sunny in the morning, becoming partly cloudy in the afternoon. Moderate fog in the morning. A chance of rain. High 90°. Heat index up to 102°. UV index up to 8. Wind south-southwest around 5 mph, gusting to 19 mph, in the morning, becoming south-southeast in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday night |
Mostly cloudy in the evening, becoming fair to partly cloudy after midnight. Moderate fog in the evening, then moderate to dense fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Precipitation showery or intermittent. Low 75°. Wind southeast around 5 mph in the evening, becoming south 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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