| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Tuesday, 30-Jun-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Clear. Moderate fog after midnight. Low 74°. Wind south-southwest around 6 mph, gusting to 23 mph. |
| Wednesday |
Sunny. Moderate fog in the morning. Hot. High 95°. Heat index up to 105°. UV index up to 11. Wind south-southwest around 6 mph, gusting to 24 mph. |
| Wednesday night |
Clear. Moderate fog after midnight. Low 72°. Wind south-southwest around 5 mph, gusting to 19 mph. |
| Thursday |
Sunny in the morning, becoming partly cloudy in the afternoon. Light to moderate fog. Rain likely in the afternoon. Thunderstorms very likely, some severe. Very hot. High 96°. Heat index up to 108°. UV index up to 11. Wind south-southwest around 5 mph, gusting to 24 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Thursday night |
Moderate fog. Rain likely in the evening, then a slight chance of rain after midnight. Scattered thunderstorms likely. Low 78°. Wind south-southwest around 4 mph. Chance of precipitation 70 percent. Precipitation mostly between a quarter and half an inch. |
| Friday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Hot. High 95°. Heat index up to 111°. UV index up to 9. Wind south-southwest around 5 mph, gusting to 23 mph. |
| Friday night |
Partly cloudy. 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 severe. Low 76°. Wind south-southwest around 4 mph, gusting to 17 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday |
Partly to mostly cloudy in the morning, becoming mostly sunny in the afternoon. Moderate fog in the morning. A chance of rain. Scattered thunderstorms likely. Hot. High 94°. Heat index up to 107°. UV index up to 9. Wind south-southwest around 4 mph, gusting to 22 mph. Chance of precipitation 30 percent. Precipitation mostly less than a tenth of an inch. |
| Saturday night |
Fair in the evening, becoming mostly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain after midnight. Thunderstorms very likely, some possibly severe. Low 76°. Wind south around 4 mph, gusting to 18 mph, in the evening, becoming west-southwest after midnight. Chance of precipitation 50 percent. Precipitation mostly around a tenth of an inch. |
| Sunday |
Mostly cloudy 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. Hot. High 92°. Heat index up to 104°. UV index up to 8. Wind west-southwest around 4 mph, gusting to 21 mph, in the morning, becoming west-northwest in the afternoon. Chance of precipitation 60 percent. Precipitation mostly less than a quarter of an inch. |
| Sunday night |
Moderate fog. Rain likely. Scattered thunderstorms likely. Low 76°. Wind north-northwest around 3 mph in the evening, becoming northeast after midnight. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Monday |
Mostly sunny. Light to moderate fog in the morning. Hot. High 91°. Heat index up to 102°. UV index up to 10. Wind southeast around 3 mph, gusting to 21 mph. |
| Monday night |
Partly cloudy in the evening, becoming mostly cloudy to cloudy after midnight. Patchy light fog in the evening, then light to 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 75°. Wind east around 3 mph, gusting to 18 mph, in the evening, becoming southwest after midnight. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
WXSIM forecast formatting script by Saratoga-Weather.org.
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