Piatt County, IL Weather Forecast
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Piatt County Weather Forecast
| REST OF TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | SUNDAY NIGHT |
| Mostly Clear | Sunny | Chance of T-Storm | Showers | Chance of Showers | Chance of T-Storm | Chance of Showers | Windy | Mostly Clear | Mostly Clear | Sunny | Partly Cloudy |
| Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 80°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 75°FHi: 24°C | Lo: 50°FLo: 10°C | Hi: 61°FHi: 16°C | Hi: 61°FHi: 16°C Lo: 39°FLo: 4°C | Hi: 61°FHi: 16°C Lo: 39°FLo: 4°C | Hi: 69°FHi: 21°C | Hi: 75°FHi: 24°C Lo: 45°FLo: 7°C |
| POP: 50% | POP: 80% | POP: 50% | POP: 90% | POP: 40% |
POP = Probability of Precipitation.
Weather Outlook Updated: 937 PM CDT Mon Oct 12 2026 

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Issued: 702 PM CDT Mon Oct 12 2026
Key Messages
- Record-breaking heat continues through Tuesday afternoon, with high temperatures reaching the upper 80s to lower 90s.
- A Marginal Risk (level 1 of 5) for severe thunderstorms exists Tuesday night. Some storms will be capable of producing localized damaging wind gusts and hail.
- Unsettled weather Tuesday night through Thursday brings periods of wet weather, with a 60 to 80 percent chance of 1 to 2 inches of event total rainfall.
- A sharp cold front transitions the region to much cooler c...
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