| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Thursday, 25-Jun-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly sunny in the morning, becoming mostly cloudy in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Scattered thunderstorms likely. High 89°. Heat index up to 93°. UV index up to 7. Wind southwest around 4 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tonight |
Mostly cloudy to cloudy in the evening, becoming dense overcast after midnight. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Scattered thunderstorms likely. Low 72°. Wind east-southeast around 3 mph, gusting to 16 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Friday |
Cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning, then patchy light fog in the afternoon. Rain likely. Scattered thunderstorms likely. High 82°. UV index up to 8. Wind south around 6 mph, gusting to 24 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Friday night |
Partly to 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. Scattered thundershowers possible. Low 73°. Wind south-southwest around 6 mph, gusting to 20 mph, in the evening, becoming west-northwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Mostly cloudy to cloudy in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. A chance of rain in the morning, then a slight chance of rain in the afternoon. High 87°. Heat index up to 94°. UV index up to 9. Wind northwest around 4 mph, gusting to 23 mph, in the morning, becoming west-southwest in the afternoon. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday night |
Fair to partly cloudy. Patchy light fog in the evening, then moderate fog after midnight. A slight chance of rain. Scattered thundershowers possible. Low 72°. Wind east-southeast around 5 mph, gusting to 21 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Sunny. Moderate fog in the morning. Hot. High 93°. Heat index up to 103°. UV index up to 9. Wind south around 7 mph, gusting to 24 mph. |
| Sunday night |
Clear in the evening, becoming fair to partly cloudy after midnight. Light to moderate fog after midnight. Low 74°. Wind south-southwest around 5 mph, gusting to 19 mph. |
| Monday |
Sunny. Light to moderate fog in the morning. Very hot. High 95°. Heat index up to 107°. UV index up to 10. Wind south-southwest around 6 mph, gusting to 24 mph. |
| Monday night |
Clear in the evening, becoming mostly clear after midnight. Light to moderate fog after midnight. Low 74°. Wind south-southwest around 4 mph. |
| Tuesday |
Sunny. Patchy light fog in the morning. Very hot. High 97°. Heat index up to 109°. UV index up to 10. Wind south-southwest around 3 mph, gusting to 21 mph. |
| Tuesday night |
Clear. Light to moderate fog after midnight. Low 74°. Wind southeast around 3 mph, gusting to 15 mph. |
| Wednesday |
Partly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. Very hot. High 96°. Heat index up to 109°. UV index up to 10. Wind south-southwest around 5 mph, gusting to 22 mph, in the morning, becoming east-southeast in the afternoon. |
| Wednesday night |
Partly cloudy in the evening, becoming clear after midnight. Light to moderate fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 75°. Wind east-southeast around 5 mph, gusting to 20 mph, in the evening, becoming west-southwest near calm after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
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