Charlestown, NH Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Charlestown, a community in Sullivan County, New Hampshire.
This Afternoon
66°F
Mostly Sunny
Mostly sunny, with a high near 66. North wind around 2 mph.
7-day forecast for Charlestown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Mostly Sunny | 2 mph N | 0% |
| Tonight | 45°F | Partly Cloudy | 0 to 3 mph SE | 0% |
| Sunday | 56°F | Rain Showers then Rain | 5 mph SE | 98% |
| Sunday Night | 45°F | Rain then Rain Showers Likely | 1 to 6 mph NE | 87% |
| Monday | 64°F | Partly Sunny | 7 mph N | 1% |
| Monday Night | 41°F | Mostly Cloudy | 5 mph N | 1% |
| Tuesday | 63°F | Partly Sunny | 3 mph NE | 1% |
| Tuesday Night | 40°F | Mostly Cloudy | 2 mph NE | 1% |
| Wednesday | 64°F | Partly Sunny | 2 to 7 mph NE | 1% |
| Wednesday Night | 40°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph NE | 15% |
| Thursday | 62°F | Chance Rain Showers | 2 to 6 mph NE | 32% |
| Thursday Night | 43°F | Chance Rain Showers | 5 mph NE | 32% |
| Friday | 64°F | Chance Rain Showers | 7 mph N | 32% |
| Friday Night | 44°F | Chance Rain Showers | 7 mph N | 32% |
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 Sep 19, 2026.