Weather WorldTri-County, IL Weather Forecast
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| TODAY | TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | FRIDAY | FRIDAY NIGHT | SATURDAY |
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| Chance of Showers | Partly Cloudy | Partly Sunny | Chance of Showers | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of Showers | Chance of Showers | Chance of Showers |
| Hi: 71°FHi: 22°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 70°FLo: 21°C | Hi: 81°FHi: 27°C | Hi: 75°FHi: 24°C Lo: 61°FLo: 16°C | Hi: 75°FHi: 24°C Lo: 61°FLo: 16°C | Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C Lo: 65°FLo: 18°C | Hi: 80°FHi: 27°C Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C Lo: 60°FLo: 16°C | Hi: 75°FHi: 24°C Lo: 60°FLo: 16°C |
| POP: 40% | POP: 50% | POP: 80% | POP: 90% | POP: 90% | POP: 70% | POP: 50% | POP: 50% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 637 AM CDT Sun Sep 13 2026 
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Issued: 542 AM CDT Sun Sep 13 2026
Key Messages
- A sharp temperatures gradient is expected across central Illinois today; highs range from the 70s northwest of I-55 to near 90 south of I-70.
- Isolated showers are possible this afternoon and evening, primarily west of I-55, with localized rainfall around 0.10 inches.
- An unsettled pattern arrives Tuesday into Wednesday with widespread showers, thunderstorms, heavy rainfall potential, and a 5-15% chance for severe weather.
Discussion
... Issued at 216 AM CDT Sun Sep 13 2026
Today and Toni...