Plymouth, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Plymouth, a village in Hancock County, Illinois.
Today
89°F
Mostly Cloudy
Mostly cloudy, with a high near 89. South southwest wind around 9 mph.
7-day forecast for Plymouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Mostly Cloudy | 9 mph SSW | 6% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 6 mph SW | 62% |
| Sunday | 77°F | Showers And Thunderstorms | 3 to 13 mph N | 80% |
| Sunday Night | 60°F | Showers And Thunderstorms Likely | 10 to 14 mph NE | 74% |
| Monday | 66°F | Showers And Thunderstorms Likely | 12 to 15 mph NE | 71% |
| Monday Night | 54°F | Chance Rain Showers | 9 to 15 mph NE | 41% |
| Tuesday | 63°F | Chance Rain Showers | 12 mph NE | 26% |
| Tuesday Night | 50°F | Partly Cloudy | 5 to 10 mph NNE | 4% |
| Wednesday | 68°F | Mostly Sunny | 6 to 9 mph NNE | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 2 to 6 mph NNE | 1% |
| Thursday | 70°F | Mostly Sunny | 6 mph NE | 4% |
| Thursday Night | 55°F | Partly Cloudy | 5 mph NE | 4% |
| Friday | 72°F | Mostly Sunny | 3 to 7 mph ENE | 7% |
| Friday Night | 55°F | Partly Cloudy | 6 mph ENE | 6% |
Forecast source: National Weather Service (api.weather.gov) for Plymouth (40.292, -90.916). Updated through the day.
Growing snapshot for Plymouth
Last spring frost
Apr 13
First fall frost
Oct 22
Growing season
191 days
Hardiness zone
6a
More local growing data for Plymouth: nearby ZIP 62367 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Augusta
Basco
Bentley
Bowen
Carthage
Dallas City
Elvaston
Ferris
Hamilton
La Harpe
Nauvoo
Niota
Pontoosuc
West Point
Climate data from the nearest NOAA station, Bentley, Il (13.4 mi from Plymouth). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.