Charlestown, NH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Charlestown, a community in Sullivan County, New Hampshire.
Today
73°F
Mostly Sunny
Mostly sunny. High near 73, with temperatures falling to around 67 in the afternoon. South wind around 5 mph.
7-day forecast for Charlestown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Mostly Sunny | 5 mph S | 2% |
| Tonight | 53°F | Partly Cloudy | 5 mph S | 1% |
| Thursday | 68°F | Light Rain Likely | 5 to 8 mph S | 69% |
| Thursday Night | 56°F | Chance Light Rain | 1 to 6 mph SW | 38% |
| Friday | 68°F | Chance Light Rain | 1 mph NW | 44% |
| Friday Night | 51°F | Light Rain Likely | 2 mph N | 64% |
| Saturday | 61°F | Chance Light Rain | 3 mph N | 45% |
| Saturday Night | 42°F | Chance Light Rain | 5 mph NW | 42% |
| Sunday | 55°F | Chance Light Rain then Partly Sunny | 3 to 7 mph NW | 30% |
| Sunday Night | 33°F | Partly Cloudy | 3 mph W | 10% |
| Monday | 52°F | Slight Chance Light Rain | 3 to 10 mph W | 17% |
| Monday Night | 30°F | Partly Cloudy | 6 mph W | 12% |
| Tuesday | 55°F | Mostly Sunny | 3 to 9 mph SW | 7% |
| Tuesday Night | 30°F | Partly Cloudy | 6 mph W | 7% |
Forecast source: National Weather Service (api.weather.gov) for Charlestown (43.236, -72.423). Updated through the day.
Growing snapshot for Charlestown
Last spring frost
May 9
First fall frost
Oct 2
Growing season
146 days
Hardiness zone
5b
More local growing data for Charlestown: nearby ZIP 03603 weather · frost dates · planting calendar · New Hampshire frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, N Springfield Lake, Vt (9.2 mi from Charlestown). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.