Portsmouth
New Hampshire, USA
Long-term weather forecast
Long-term weather forecast

June weather forecast and climate
Portsmouth, NH

Bright neon lights and buildings next to the very calm waters of the iconic Piscataqua River in Portsmouth, New Hampshire, the clear dusk sky in close up view
Bright neon lights and buildings next to the very calm waters of the iconic Piscataqua River in Portsmouth, New Hampshire, the clear dusk sky in close up view
The first month of the summer, June, is a pleasant month in Portsmouth, New Hampshire, with average temperature fluctuating between 55°F (12.8°C) and 73°F (22.8°C).

Temperature

In June, the average high-temperature rises, from an enjoyable 64°F (17.8°C) in May, to a pleasant 73°F (22.8°C). In Portsmouth, the average low-temperature is 55°F (12.8°C).

Rainfall

In Portsmouth, during June, the rain falls for 11 days and regularly aggregates up to 3.1" (78mm) of precipitation. In Portsmouth, New Hampshire, during the entire year, the rain falls for 125 days and collects up to 42.4" (1078mm) of precipitation.

Ocean temperature

In Portsmouth, the average water temperature is 55.9°F (13.3°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

June has the longest days of the year in Portsmouth, with an average of 15.3h of daylight.

Sunshine

Months with the most sunshine in Portsmouth, New Hampshire, are June through August, with an average of 9h of sunshine.

UV index

June and July, with an average maximum UV index of 8, are months with the highest UV index. A UV Index value of 8 to 10 symbolizes a very high threat to health from unsafe exposure to the UV radiation for the ordinary person.
In June, the average maximum UV index of 8 translate into the following recommendations:
Take special precautions, as unprotected skin can be damaged and can burn quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in June in Portsmouth?

In June, in Portsmouth, the average high-temperature is 73°F (22.8°C), and the average low-temperature is 55°F (12.8°C).

How many days does it rain in June in Portsmouth?

In Portsmouth, New Hampshire, in June, it is raining for 11 days, with typically 3.1" (78mm) of accumulated precipitation.

What is the ocean temperature in June in Portsmouth?

In June, the average ocean temperature is 55.9°F (13.3°C). Swimming in 55.9°F (13.3°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

When are the longest days in Portsmouth?

The month with the longest days in Portsmouth is June, with an average of 15.3h of daylight.

What is the average length of the day in June in Portsmouth?

In Portsmouth, the average length of the day in June is 15.3h.

What are the months with the most sunshine in Portsmouth?

Months with the most sunshine in Portsmouth, New Hampshire, are June through August, with an average of 9h of sunshine.

How many hours of sunshine does Portsmouth have in June?

In June, the average sunshine is 9h.

What is the month with the highest UV index in Portsmouth?

June and July, with an average maximum UV index of 8, are months with the highest UV index in Portsmouth.

What is the UV index intensity in June in Portsmouth?

In June, the average daily maximum UV index is 8. A UV Index of 8 to 10 symbolizes a very high health risk from unsafe exposure to the Sun's UV rays.
Average temperature in June - Portsmouth, NH
  • Average high temperature in June: 73°F

The warmest month (with the highest average high temperature) is July (79°F).
Months with the lowest average high temperature are January and February (32°F).

  • Average low temperature in June: 55°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (16°F).

Average rainfall in June - Portsmouth, NH
  • Average rainfall in June: 3.1"

The wettest month (with the highest rainfall) is November (4.9").
The driest month (with the lowest rainfall) is August (2.8").

Average rainfall days in June - Portsmouth, NH
  • Average rainfall days in June: 11 days

Months with the highest number of rainy days are May and December (12 days).
The month with the lowest number of rainy days is September (8 days).

Average sea temperature in June - Portsmouth, NH
  • Average sea temperature in June: 55.9°F

The best month for swimming (with the highest average sea temperature) is August (65.6°F).
The coldest month (with the lowest average sea temperature) is March (38.5°F).

Average daylight in June / Average sunshine in June - Portsmouth, NH
  • Average daylight in June: 15.3h

The month with the longest days is June (Average daylight: 15.3h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in June: 9h

Months with most sunshine are June, July and August (Average sunshine: 9h).
Months with least sunshine are January, November and December (Average sunshine: 5).

Average UV index in June - Portsmouth, NH
  • Average UV index in June: 8

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).