| WXSIM Forecast for:
O'Fallon Issued by: OFallonweather.com |
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| Updated: Friday, 03-Jul-2026 04:00 pm | ||||||||||||||||||||||||||||||||||||||||||||||||
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| Tonight |
Fair to partly cloudy in the evening, becoming partly cloudy after midnight. Patchy light fog in the evening, then moderate fog after midnight. A chance of rain in the evening, then rain likely after midnight. Thunderstorms very likely, some possibly severe. Low 76°. Wind southeast around 4 mph, gusting to 21 mph. Chance of precipitation 70 percent. Precipitation mostly around a quarter of an inch. |
| Saturday |
Partly cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Moderate fog in the morning. Rain likely. Thunderstorms very likely, some severe. Hot. High 93°. Heat index up to 105°. UV index up to 8. Wind west-southwest around 5 mph, gusting to 24 mph. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Saturday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog. A chance of rain. Scattered thunderstorms likely. Low 76°. Wind south-southeast around 2 mph, gusting to 19 mph, in the evening, becoming west after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday |
Partly to mostly cloudy in the morning, becoming partly to mostly sunny in the afternoon. Light to moderate fog in the morning. A chance of rain. Thunderstorms very likely, some possibly severe. Hot. High 90°. Heat index up to 101°. UV index up to 9. Wind west-northwest around 3 mph, gusting to 23 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Sunday night |
Partly cloudy. Light to moderate fog in the evening, then moderate fog after midnight. Rain likely. Scattered thunderstorms likely. Low 74°. Wind north around 2 mph, gusting to 19 mph. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Monday |
Partly cloudy. Moderate fog in the morning. A chance of rain. Scattered thundershowers possible. High 88°. Heat index up to 95°. UV index up to 6. Wind north around 4 mph, gusting to 22 mph. Chance of precipitation 50 percent. Precipitation mostly less than a tenth of an inch. |
| Monday night |
Partly cloudy in the evening, becoming partly to mostly cloudy after midnight. Patchy light fog after midnight. A chance of rain. Low 72°. Wind north around 4 mph, gusting to 20 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday |
Mostly cloudy in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 88°. Heat index up to 93°. UV index up to 8. Wind northeast around 4 mph, gusting to 24 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Tuesday night |
Mostly clear in the evening, becoming fair after midnight. Light to moderate fog after midnight. Low 70°. Wind northeast around 3 mph, gusting to 21 mph. |
| Wednesday |
Partly to mostly sunny in the morning, becoming partly cloudy in the afternoon. Patchy light fog in the morning. Hot. High 91°. Heat index up to 98°. UV index up to 8. Wind east-southeast around 3 mph, gusting to 20 mph. |
| Wednesday night |
Partly to mostly cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain. Scattered thunderstorms likely. Low 74°. Wind south-southeast around 3 mph, gusting to 17 mph, in the evening, becoming south-southwest after midnight. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
| Thursday |
Partly cloudy. Light to moderate fog in the morning. Rain likely. Thunderstorms very likely, some possibly severe. Hot. High 91°. Heat index up to 99°. UV index up to 9. Wind west-southwest around 4 mph, gusting to 22 mph. Chance of precipitation 60 percent. Precipitation mostly around a tenth of an inch. |
| Thursday night |
Fair to partly cloudy. Patchy light fog in the evening, then light to moderate fog after midnight. A chance of rain. Scattered thunderstorms likely, some possibly severe. Low 71°. Wind northwest around 3 mph, gusting to 19 mph. Chance of precipitation 40 percent. Precipitation mostly less than a tenth of an inch. |
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