| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 09-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Mostly clear. Light to moderate fog in the evening, then moderate fog after midnight. Low 74°. Wind southwest around 6 mph, gusting to 23 mph. |
| Wednesday |
Partly cloudy. Light to moderate fog in the morning. A slight chance of rain in the afternoon. Scattered thunderstorms likely. Very hot. High 94°. Heat index up to 102°. UV index up to 9. Wind southwest around 9 mph, gusting to 27 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Partly cloudy. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 75°. Wind south-southwest around 7 mph, gusting to 22 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Thursday |
Mostly sunny. Moderate fog in the morning. Very hot. High 94°. Heat index up to 105°. UV index up to 10. Wind south around 7 mph, gusting to 27 mph, in the morning, becoming 12 mph, gusting to 28 mph, in the afternoon. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Low 71°. Wind west around 9 mph, gusting to 25 mph, in the evening, becoming 6 mph, gusting to 17 mph, after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Friday |
Sunny. Patchy light fog in the morning. Hot. High 87°. UV index up to 8. Wind west-northwest around 5 mph, gusting to 24 mph. |
| Friday night |
Clear in the evening, becoming mostly clear after midnight. Light to moderate fog after midnight. Low 67°. Wind east-northeast around 2 mph, gusting to 19 mph, in the evening, becoming south-southwest after midnight. |
| Saturday |
Partly to mostly cloudy. Patchy light fog in the morning. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thundershowers possible. Hot. High 88°. Heat index up to 92°. UV index up to 9. Wind south-southwest around 6 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly less than a quarter of an inch. |
| Saturday night |
Mostly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Light to moderate fog in the evening, then moderate fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Thunderstorms very likely, some possibly severe. Low 72°. Wind south-southwest around 6 mph, gusting to 18 mph, in the evening, becoming west after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thunderstorms likely. High 83°. UV index up to 8. Wind north around 7 mph, gusting to 26 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Mostly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 65°. Wind north-northeast around 4 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Monday |
Mostly cloudy to cloudy in the morning, becoming dense overcast in the afternoon. Patchy light fog in the morning. A chance of rain. Scattered thundershowers possible. Relatively cool. High 72°. Wind west-northwest around 4 mph, gusting to 19 mph, in the morning, becoming 12 mph, gusting to 30 mph, in the afternoon. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Partly cloudy in the evening, becoming clear after midnight. Relatively cool. Low 58°. Wind west-northwest around 11 mph, gusting to 29 mph, in the evening, becoming 6 mph, gusting to 21 mph, after midnight. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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