Portsmouth, NH Weather & Growing Conditions
This Afternoon
77°F
Sunny
Sunny, with a high near 77. Northwest wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Sunny | 10 mph NW | 0% |
| Tonight | 46°F | Partly Cloudy | 5 to 10 mph N | 0% |
| Saturday | 64°F | Sunny | 5 mph E | 0% |
| Saturday Night | 47°F | Partly Cloudy | 0 to 5 mph S | 0% |
| Sunday | 63°F | Rain Showers Likely | 0 to 5 mph S | 73% |
| Sunday Night | 51°F | Rain Showers | 0 to 5 mph NE | 82% |
| Monday | 65°F | Chance Rain Showers then Mostly Sunny | 5 to 10 mph NE | 25% |
| Monday Night | 48°F | Partly Cloudy | 0 to 10 mph NE | 3% |
| Tuesday | 61°F | Partly Sunny | 5 to 10 mph NE | 3% |
| Tuesday Night | 47°F | Mostly Cloudy | 5 to 10 mph NE | 1% |
| Wednesday | 60°F | Mostly Sunny | 10 to 15 mph NE | 3% |
| Wednesday Night | 47°F | Mostly Cloudy | 5 to 10 mph NE | 9% |
| Thursday | 60°F | Chance Rain Showers | 5 to 15 mph NE | 28% |
| Thursday Night | 48°F | Chance Rain Showers | 5 to 10 mph NE | 29% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Portsmouth, NH
Last spring frost
May 4
First fall frost
Oct 8
Growing season
157 days
Hardiness zone
6a
Explore more for Portsmouth, NH: full frost dates · planting calendar · New Hampshire frost dates
Climate data from the nearest NOAA station, Greenland, Nh (1.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.