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Cornerville, IL Weather Forecast
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Cornerville Weather Forecast
| THIS AFTERNOON | TONIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  |  |  | | | | | | |  |  |
| Chance of Showers | Chance of T-Storm | Mostly Sunny | Mostly Clear | Sunny | Clear | Mostly Clear | Mostly Clear | Chance of Showers | Chance of Showers | Partly Cloudy | Partly Cloudy |
| Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 61°FLo: 16°C | Hi: 90°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 99°FHi: 37°C Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C Lo: 71°FLo: 22°C | Lo: 71°FLo: 22°C | Hi: 91°FHi: 33°C | Hi: 89°FHi: 32°C Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C Lo: 65°FLo: 18°C |
| POP: 20% | POP: 20% | POP: 30% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1237 PM CDT Sat Sep 05 2026 
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Issued: 1220 PM CDT Sat Sep 5 2026
Key Messages
- An Extreme Heat Warning remains in effect through 8 PM this evening. Temperatures will once again push 100 today, while heat index values will range from 105 to 110. There is a 30-50% chance of triple digit heat index values continuing into Sunday mainly over western portions of southeast Missouri.
- Scattered showers and thunderstorms will be possible throughout the Quad State this afternoon and evening. Gusty winds, lightning and brief heavy downpours will be the primary concerns.
- La...