Plymouth, IL Weather & Growing Conditions
Today
88°F
Sunny
Sunny, with a high near 88. South southwest wind 5 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 5 to 8 mph SSW | 0% |
| Tonight | 69°F | Partly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SSE | 20% |
| Wednesday | 84°F | Chance Showers And Thunderstorms | 5 mph SSW | 51% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 2 to 6 mph NNE | 87% |
| Thursday | 81°F | Showers And Thunderstorms | 3 mph SE | 85% |
| Thursday Night | 64°F | Partly Cloudy | 2 mph ENE | 12% |
| Friday | 84°F | Mostly Sunny | 2 mph SSW | 6% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 1 mph S | 26% |
| Saturday | 87°F | Slight Chance Showers And Thunderstorms then Sunny | 1 to 6 mph SSW | 22% |
| Saturday Night | 71°F | Mostly Clear | 3 to 8 mph SSW | 7% |
| Sunday | 89°F | Sunny | 7 to 13 mph SSW | 6% |
| Sunday Night | 72°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 7 to 10 mph SSW | 16% |
| Monday | 89°F | Slight Chance Showers And Thunderstorms then Mostly Sunny | 7 to 12 mph SSW | 16% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 8 mph SSW | 27% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Plymouth, IL
Last spring frost
Apr 13
First fall frost
Oct 22
Growing season
191 days
Hardiness zone
6a
Explore more for Plymouth, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Bentley, Il (13.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.