Weather WorldTri, IL Weather Forecast
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Tri Weather Forecast
| TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY |
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| Partly Cloudy | Mostly Sunny | Partly Cloudy | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Mostly Clear | Mostly Clear | Chance of Showers | Mostly Sunny | Mostly Clear | Mostly Sunny |
| Lo: 59°FLo: 15°C | Hi: 91°FHi: 33°C | Lo: 70°FLo: 21°C | Hi: 95°FHi: 35°C | Lo: 65°FLo: 18°C | Hi: 81°FHi: 27°C | Hi: 85°FHi: 29°C Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C Lo: 59°FLo: 15°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 65°FLo: 18°C | Hi: 89°FHi: 32°C |
| POP: 40% | POP: 90% | POP: 50% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 437 PM CDT Mon Sep 07 2026 
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Issued: 140 PM CDT Mon Sep 7 2026
Key Messages
- Summer heat and humidity return Tuesday and Wednesday. Heat indices are forecast to exceed 100 degrees Wednesday afternoon, mainly south of Interstate 72.
- Rain and thunderstorms move in Wednesday and Wednesday night, bringing a 0.25 to 0.75-inch average rainfall. There is a 10% chance for localized rain totals over 1.0 to 1.5
Discussion
... Issued at 135 PM CDT Mon Sep 7 2026
Today through Tonight A welcome break from the recent heat wave continues the rest of today under the influence ...