Plymouth, IL Weather Forecast
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Plymouth Weather Forecast
| THIS AFTERNOON | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY |
| Mostly Sunny | Mostly Clear | Sunny | Chance of T-Storm | Showers | Showers | Chance of T-Storm | Mostly Cloudy | Mostly Sunny | Mostly Clear | Mostly Clear | Sunny |
| Hi: 89°FHi: 32°C | Lo: 70°FLo: 21°C | Hi: 85°FHi: 29°C | Lo: 65°FLo: 18°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C | Hi: 71°FHi: 22°C | Lo: 49°FLo: 9°C | Hi: 60°FHi: 16°C | Hi: 61°FHi: 16°C Lo: 40°FLo: 4°C | Hi: 61°FHi: 16°C Lo: 40°FLo: 4°C | Hi: 69°FHi: 21°C |
| POP: 70% | POP: 70% | POP: 60% | POP: 100% |
POP = Probability of Precipitation.
Weather Outlook Updated: 126 PM CDT Mon Oct 12 2026 

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Issued: 155 PM CDT Mon Oct 12 2026
Key Messages
- Continued unseasonably warm through Tuesday. Refer to the climate section for specific numbers.
- There is a Marginal (level 1 of 5) risk for isolated severe storms Tuesday night, with the main hazards heavy downpours and large hail.
- A strong cold front to sweep through Friday will bring much cooler temps for the weekend and the risk for frost, especially Friday night.
- Above normal temps return Sunday and Monday.
Aviation
/18Z TAFS THROUGH 18Z TUESDAY/... Issued at 1241 PM CDT Mon Oct 12...
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