Karnak, IL Weather Forecast
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Karnak Weather Forecast
| THIS AFTERNOON | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | SATURDAY | SUNDAY | SUNDAY NIGHT | MONDAY |
| Sunny | Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Partly Cloudy | Chance of Showers |
| Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 95°FHi: 35°C | Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C Lo: 71°FLo: 22°C | Lo: 70°FLo: 21°C | Hi: 89°FHi: 32°C |
| POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 127 PM CDT Tue Sep 15 2026 

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Issued: 1202 PM CDT Tue Sep 15 2026
Key Messages
- A headlining late season heat wave with high temperatures near or at record levels continues thru the rest of the week.
- A cold front`s late weekend passage will bring a chance of rain and cooler and less humid conditions early next week.
Discussion
... Issued at 1202 PM CDT Tue Sep 15 2026
The blast of furnace heat shows no signs of abating the remainder of the week. The upper (H5) high holds strong in the upper 590s DM while gradually retrograding across the FA. H8 temps actually incre...
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