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Sumner High School, IL Weather Forecast
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Sumner High School Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY |
 |  |  |  |  |  |  | | |  | |  |
| Mostly Clear | Chance of T-Storm | Chance of T-Storm | Showers | Chance of Showers | Partly Sunny | Clearing | Chance of Showers | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear |
| Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Lo: 71°FLo: 22°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 91°FHi: 33°C | Hi: 91°FHi: 33°C Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C Lo: 70°FLo: 21°C |
| POP: 20% | POP: 50% | POP: 90% | POP: 40% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1107 PM CDT Tue Sep 08 2026 
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Issued: 504 PM CDT Tue Sep 8 2026
Key Messages
- Hot temperatures return today and especially Wednesday, with highs in the 90s today, and the middle 90s to around 100 degrees Wednesday. Heat index readings today will be around 100 degrees, and in the 100 to 110 degree range Wednesday.
- An approaching cold front will provide chances of showers and some thunderstorms late Wednesday through Thursday night. The best chances of 75% to 95% will be late Wednesday night through the day Thursday.
- 20-30% chances of showers and storms will lin...