Plymouth, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Plymouth, a village in Hancock County, Illinois.
Overnight
51°F
Mostly Cloudy
Mostly cloudy, with a low around 51. Southwest wind around 13 mph, with gusts as high as 23 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Plymouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Mostly Cloudy | 13 mph SW | 6% |
| Wednesday | 55°F | Mostly Cloudy | 14 to 18 mph WSW | 9% |
| Wednesday Night | 45°F | Mostly Cloudy | 13 mph WSW | 3% |
| Thursday | 57°F | Slight Chance Rain Showers | 9 to 14 mph W | 17% |
| Thursday Night | 43°F | Slight Chance Rain Showers | 9 mph NW | 23% |
| Friday | 52°F | Partly Sunny | 7 to 10 mph N | 10% |
| Friday Night | 32°F | Partly Cloudy | 1 to 6 mph N | 0% |
| Saturday | 52°F | Mostly Sunny | 1 to 5 mph NW | 0% |
| Saturday Night | 34°F | Mostly Clear | 3 mph WNW | 1% |
| Sunday | 58°F | Sunny | 3 to 8 mph W | 2% |
| Sunday Night | 35°F | Clear | 3 mph WSW | 0% |
| Monday | 64°F | Sunny | 2 to 8 mph SW | 0% |
| Monday Night | 41°F | Clear | 6 mph WSW | 0% |
| Tuesday | 65°F | Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.