| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Saturday, 05-Jul-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Partly to mostly cloudy. Light to moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 74°. Wind south-southwest around 5 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly to mostly cloudy in the morning, becoming 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 thundershowers possible. High 89°. Heat index up to 95°. UV index up to 6. Wind west-southwest around 7 mph, gusting to 24 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Sunday night |
Mostly cloudy to cloudy in the evening, becoming partly to mostly 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. Precipitation showery or intermittent. Low 75°. Wind west-southwest around 3 mph, gusting to 17 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Monday |
Partly to mostly cloudy. Light to moderate fog in the morning. A chance of rain. High 87°. Heat index up to 93°. UV index up to 6. Wind north-northwest around 4 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Partly cloudy. Light to moderate fog after midnight. A chance of rain. Low 72°. Wind north-northeast around 3 mph, gusting to 19 mph, in the evening, becoming east after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain. High 90°. Heat index up to 97°. UV index up to 9. Wind east-southeast around 3 mph, gusting to 22 mph, in the morning, becoming northeast in the afternoon. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Low 74°. Wind south-southeast around 2 mph in the evening, becoming west-southwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Precipitation showery or intermittent. High 89°. Heat index up to 97°. UV index up to 8. Wind south around 3 mph, gusting to 20 mph, in the morning, becoming west in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Fair in the evening, becoming mostly clear after midnight. Patchy light fog in the evening, then moderate fog after midnight. Low 73°. Wind west-southwest around 2 mph, gusting to 15 mph. |
| Thursday |
Sunny in the morning, becoming mostly sunny in the afternoon. Light to moderate fog in the morning. Hot. High 91°. Heat index up to 101°. UV index up to 9. Wind south around 2 mph, gusting to 21 mph, in the morning, becoming southeast in the afternoon. |
| Thursday night |
Fair to partly cloudy. Patchy light fog in the evening, then moderate fog after midnight. A slight chance of rain. Precipitation showery or intermittent. Low 74°. Wind south-southeast around 3 mph, gusting to 16 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Very hot. High 97°. Heat index up to 108°. UV index up to 8. Wind south around 6 mph, gusting to 22 mph. |
| Friday night |
Clear in the evening, becoming partly cloudy after midnight. Moderate fog after midnight. A chance of rain after midnight. Precipitation showery or intermittent. Low 72°. Wind south-southwest around 6 mph, gusting to 19 mph, in the evening, becoming west-northwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
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