| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 14-Jul-2026 05:00 am | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Today |
Mostly sunny in the morning, becoming partly to mostly sunny in the afternoon. Hot. High 91°. UV index up to 9. Wind northeast around 5 mph, gusting to 24 mph. |
| Tonight |
Fair to partly cloudy in the evening, becoming fair after midnight. Patchy light fog after midnight. Low 69°. Wind northeast around 3 mph, gusting to 18 mph. |
| Wednesday |
Mostly sunny in the morning, becoming partly to mostly sunny 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. High 88°. Heat index up to 94°. UV index up to 9. Wind northeast around 4 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Wednesday night |
Fair to partly cloudy in the evening, becoming fair after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain. Precipitation showery or intermittent. Low 72°. Wind east around 2 mph in the evening, becoming south-southeast after midnight. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Partly to mostly sunny in the morning, becoming partly 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 thunderstorms likely. High 90°. Heat index up to 98°. UV index up to 8. Wind south-southeast around 3 mph, gusting to 21 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Thursday night |
Mostly cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 75°. Wind south-southwest around 3 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Friday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Light to moderate fog in the morning. Rain likely. Thunderstorms very likely, some possibly severe. High 86°. Heat index up to 93°. UV index up to 7. Wind west-southwest around 5 mph, gusting to 20 mph. Chance of precipitation 60 percent. Precipitation mostly around a quarter of an inch. |
| Friday night |
Mostly 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. Thunderstorms very likely, some possibly severe. Low 75°. Wind west-southwest around 5 mph. Chance of precipitation 40 percent. Precipitation mostly around a tenth of an inch. |
| Saturday |
Partly to mostly sunny in the morning, becoming mostly sunny in the afternoon. Moderate fog in the morning. Hot. High 93°. Heat index up to 105°. UV index up to 9. Wind west-southwest around 9 mph, gusting to 25 mph. |
| Saturday night |
Clear. Light to moderate fog after midnight. Low 74°. Wind west-southwest around 7 mph, gusting to 21 mph. |
| Sunday |
Sunny. Light to moderate fog in the morning. Hot. High 95°. Heat index up to 105°. UV index up to 10. Wind west-southwest around 7 mph, gusting to 22 mph. |
| Sunday night |
Fair in the evening, becoming mostly cloudy to cloudy after midnight. Low 77°. Wind west-southwest around 4 mph, gusting to 17 mph. |
| Monday |
Partly to mostly cloudy in the morning, becoming mostly sunny in the afternoon. Very hot. High 97°. Heat index up to 105°. UV index up to 9. Wind west-southwest around 7 mph, gusting to 25 mph. |
| Monday night |
Fair to partly cloudy in the evening, becoming clear after midnight. Low 72°. Wind west-southwest around 5 mph, gusting to 19 mph. |
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