| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Wednesday, 08-Jul-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Partly to mostly cloudy in the morning, becoming partly cloudy in the afternoon. A chance of rain. High 87°. Heat index up to 92°. UV index up to 8. Wind southwest around 2 mph, gusting to 20 mph. Chance of precipitation 50 percent. Precipitation mostly less than a quarter of an inch. |
| Tonight |
Fair to partly cloudy. Patchy light fog in the evening, then moderate fog after midnight. Low 71°. Wind south around 4 mph. |
| Thursday |
Partly cloudy in the morning, becoming partly to mostly 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. Scattered thunderstorms likely. Hot. High 94°. Heat index up to 101°. UV index up to 9. Wind southwest around 4 mph, gusting to 23 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Moderate fog. Rain likely. Scattered thunderstorms likely. Low 74°. Wind south-southwest around 4 mph, gusting to 16 mph. Chance of precipitation 70 percent. Precipitation mostly around half an inch. |
| Friday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog in the morning, then patchy light fog in the afternoon. A slight chance of rain in the morning, then a chance of rain in the afternoon. Thunderstorms very likely, some possibly severe. Hot. High 91°. Heat index up to 101°. UV index up to 8. Wind southwest around 4 mph, gusting to 24 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Friday night |
Partly cloudy in the evening, becoming mostly cloudy after midnight. Moderate fog in the evening, then light to moderate fog after midnight. A chance of rain. Scattered thundershowers possible. Low 75°. Wind north around 2 mph in the evening, becoming west-northwest after midnight. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday |
Mostly cloudy. Light to moderate 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 87°. Heat index up to 94°. UV index up to 6. Wind north-northeast around 5 mph, gusting to 23 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Partly to mostly cloudy in the evening, becoming mostly cloudy after midnight. Patchy light fog. A slight chance of rain. Low 73°. Wind northeast around 4 mph, gusting to 19 mph. Chance of precipitation 20 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly to mostly cloudy in the morning, becoming mostly sunny in the afternoon. Patchy light fog in the morning. High 89°. Heat index up to 96°. UV index up to 9. Wind northeast around 6 mph, gusting to 24 mph. |
| Sunday night |
Clear. Light to moderate fog after midnight. Low 69°. Wind east-northeast around 4 mph, gusting to 23 mph. |
| Monday |
Sunny. Light to moderate fog in the morning. High 88°. Heat index up to 94°. UV index up to 10. Wind east-northeast around 5 mph, gusting to 24 mph. |
| Monday night |
Clear. Patchy light fog after midnight. Low 68°. Wind east around 3 mph, gusting to 21 mph. |
| Tuesday |
Sunny. Patchy light fog in the morning. High 90°. Heat index up to 96°. UV index up to 9. Wind east-northeast around 2 mph, gusting to 20 mph. |
| Tuesday night |
Mostly clear in the evening, becoming fair after midnight. Patchy light fog after midnight. Low 71°. Wind east-northeast around 1 mph, gusting to 16 mph. |
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