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
Sunny
Sunny, with a high near 89. South wind 5 to 8 mph.
7-day forecast for Plymouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Sunny | 5 to 8 mph S | 0% |
| Tonight | 69°F | Slight Chance Showers And Thunderstorms | 5 mph SSE | 20% |
| Wednesday | 84°F | Chance Showers And Thunderstorms | 5 mph SSW | 52% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 6 mph N | 87% |
| Thursday | 81°F | Showers And Thunderstorms | 5 mph SE | 85% |
| Thursday Night | 64°F | Partly Cloudy | 0 to 3 mph ESE | 11% |
| Friday | 84°F | Mostly Sunny | 2 mph S | 6% |
| Friday Night | 66°F | Chance Showers And Thunderstorms | 2 mph S | 26% |
| Saturday | 87°F | Slight Chance Showers And Thunderstorms then Sunny | 2 to 6 mph SSW | 22% |
| Saturday Night | 71°F | Mostly Clear | 3 to 8 mph SSW | 7% |
| Sunday | 89°F | Sunny | 8 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 | 8 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) 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 Aug 4, 2026.