Plymouth, NH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Plymouth, a community in Grafton County, New Hampshire.
Today
73°F
Mostly Sunny
Mostly sunny. High near 73, with temperatures falling to around 65 in the afternoon. Southwest wind 0 to 5 mph.
7-day forecast for Plymouth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Mostly Sunny | 0 to 5 mph SW | 3% |
| Tonight | 47°F | Partly Cloudy | 0 mph | 2% |
| Thursday | 66°F | Light Rain Likely | 0 to 5 mph S | 74% |
| Thursday Night | 53°F | Chance Light Rain | 0 to 5 mph SW | 43% |
| Friday | 66°F | Chance Light Rain | 0 mph | 39% |
| Friday Night | 49°F | Light Rain Likely | 0 mph | 70% |
| Saturday | 59°F | Light Rain Likely | 0 mph | 57% |
| Saturday Night | 40°F | Chance Light Rain | 0 to 5 mph NW | 43% |
| Sunday | 52°F | Chance Light Rain | 5 to 10 mph NW | 36% |
| Sunday Night | 33°F | Partly Cloudy then Slight Chance Light Rain | 0 mph | 15% |
| Monday | 49°F | Slight Chance Light Rain | 5 to 10 mph NW | 22% |
| Monday Night | 30°F | Slight Chance Light Rain then Partly Cloudy | 5 mph W | 18% |
| Tuesday | 51°F | Mostly Sunny | 5 to 10 mph W | 14% |
| Tuesday Night | 29°F | Mostly Cloudy | 5 to 10 mph W | 14% |
Forecast source: National Weather Service (api.weather.gov) for Plymouth (43.739, -71.703). Updated through the day.
Growing snapshot for Plymouth
Last spring frost
May 20
First fall frost
Sep 27
Growing season
128 days
Hardiness zone
5b
More local growing data for Plymouth: nearby ZIP 03264 weather · frost dates · planting calendar · New Hampshire frost dates
Nearby towns & communities
Ashland
Bethlehem
Bristol
Canaan
Enfield
Lebanon
Lincoln
Lisbon
Littleton
Mountain Lakes
North Haverhill
North Woodstock
Woodsville
Climate data from the nearest NOAA station, Plymouth, Nh (4 mi from Plymouth). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.