WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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Updated: Friday, 18-Jul-2025 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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Tonight |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Moderate fog. A chance of rain in the evening, then a slight chance of rain after midnight. Low 76°. Wind south-southeast around 3 mph, gusting to 15 mph. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
Saturday |
Partly to mostly sunny. Moderate fog in the morning. A chance of rain. Scattered thundershowers possible. Hot. High 95°. Heat index up to 106°. UV index up to 8. Wind south-southwest around 6 mph, gusting to 25 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
Saturday night |
Fair in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 76°. Wind south-southwest around 4 mph, gusting to 20 mph. |
Sunday |
Partly cloudy in the morning, becoming partly to mostly sunny in the afternoon. A chance of rain. Scattered thundershowers possible. Hot. High 95°. Heat index up to 106°. UV index up to 9. Wind south-southwest around 7 mph, gusting to 26 mph, in the morning, becoming west in the afternoon. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
Sunday night |
Partly cloudy in the evening, becoming fair to partly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Scattered thundershowers possible. Low 74°. Wind east around 3 mph, gusting to 18 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
Monday |
Partly cloudy. Light to moderate fog in the morning. A chance of rain. Scattered thunderstorms likely. Hot. High 95°. Heat index up to 105°. UV index up to 8. Wind south around 3 mph, gusting to 21 mph, in the morning, becoming east in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
Monday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Patchy light fog. Low 73°. Wind east-southeast around 4 mph. |
Tuesday |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Patchy light fog in the morning. A chance of rain in the afternoon. Scattered thundershowers possible. Hot. High 96°. Heat index up to 106°. UV index up to 9. Wind southeast around 5 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
Tuesday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A slight chance of rain. Scattered thundershowers possible. Low 74°. Wind southeast around 5 mph, gusting to 19 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
Wednesday |
Sunny in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. Very hot. High 98°. Heat index up to 109°. UV index up to 9. Wind south around 5 mph, gusting to 22 mph. |
Wednesday night |
Clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. Low 74°. Wind south-southeast around 5 mph, gusting to 17 mph. |
Thursday |
Sunny. Patchy light fog in the morning. Very hot. High 97°. Heat index up to 107°. UV index up to 9. Wind southwest around 5 mph, gusting to 21 mph, in the morning, becoming west in the afternoon. |
Thursday night |
Mostly clear in the evening, becoming partly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain after midnight. Precipitation showery or intermittent. Low 74°. Wind south-southeast around 4 mph in the evening, becoming southwest after midnight. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.