June weather forecast
Portsmouth, NH

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Bright neon lights and buildings next to the very calm waters of the iconic Piscataqua River in Portsmouth, New Hampshire
Bright neon lights and buildings next to the very calm waters of the iconic Piscataqua River in Portsmouth, New Hampshire

Weather in June

June straddles the edge of spring and summons the heat of summer as temperatures climb up further. Portsmouth experiences a balance of sun and rains, with humidity peaking for the first time in the year. The seaside town dons its bright sunny look, thanks to the increased daylight hours. Sea temperatures rise to a pleasant 55.9°F (13.3°C) enhancing the beach appeal, perfect for water activities. The breezy evening welcomes the summer, characterized by the gentlest winds of the year.

Temperature

Portsmouth perceives a slight temperature ascent during June, with average high-temperatures adjusting from a refreshing 61°F (16.1°C) in May to an agreeable 69.3°F (20.7°C). In June, Portsmouth experiences a temperature dip to an average of 55.4°F (13°C) at night.

Humidity

The most humid month in Portsmouth is June, with an average relative humidity of 80%.

Rainfall

In Portsmouth, in June, during 15 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. Throughout the year, in Portsmouth, there are 144.2 rainfall days, and 27.48" (698mm) of precipitation is accumulated.

Snowfall

In Portsmouth, snow does not fall in May through September.

Ocean temperature

In Portsmouth, in June, the average water temperature is 55.9°F (13.3°C).
Note: Dipping in 55.9°F (13.3°C) at temperatures less than 50°F (10°C) without proper gear can lead to pronounced cold shock and breathing difficulties.

Daylight

June has the longest days of the year in Portsmouth, New Hampshire, with an average of 15h and 18min of daylight.
On the first day of the month, sunrise is at 5:05 am and sunset at 8:16 pm. On the last day of June, sunrise is at 5:07 am and sunset at 8:26 pm EDT.

Sunshine

In Portsmouth, New Hampshire, the average sunshine in June is 9.2h.

UV index

In Portsmouth, New Hampshire, the average daily maximum UV index in June is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.
Note: An average maximum UV index of 5 in June leads to these recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
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Frequently asked questions

What is the temperature in June in Portsmouth?

In Portsmouth, in June, the average high-temperature is 69.3°F (20.7°C), and the average low-temperature is 55.4°F (13°C).

What is the most humid month in Portsmouth?

June is the most humid month in Portsmouth, with an average relative humidity of 80%.

What is the average humidity in June in Portsmouth?

The average relative humidity in June in Portsmouth is 80%.

How much does it rain in Portsmouth in June?

In June, in Portsmouth, the rain falls for 15 days. Throughout June, 2.6" (66mm) of precipitation is accumulated.

When it does not snow in Portsmouth?

In Portsmouth, snow does not fall in May through September.

How cold is the water in June in Portsmouth?

In Portsmouth, New Hampshire, in June, the average water 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?

June has the longest days of the year in Portsmouth, New Hampshire, with an average of 15h and 18min of daylight.

How many hours of daylight does Portsmouth have in June?

The average day length in June in Portsmouth is 15h and 19min.

When is the sunrise / sunset in June in Portsmouth?

On the first day of June in Portsmouth, New Hampshire, sunrise is at 5:05 am and sunset at 8:16 pm. On the last day of the month, sunrise is at 5:07 am and sunset at 8:26 pm EDT.

How many hours of sunshine does Portsmouth have in June?

The average sunshine duration in June in Portsmouth, New Hampshire, is 9.2h.

What is the UV index intensity in June in Portsmouth?

In Portsmouth, the average daily maximum UV index in June is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in June
Portsmouth, NH

Average temperature in June - Portsmouth, NH
  • Average high temperature in June: 69.3°F

The warmest month (with the highest average high temperature) is July (76.3°F).
The month with the lowest average high temperature is January (31.8°F).

  • Average low temperature in June: 55.4°F

The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

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Average pressure in June
Portsmouth, NH

Average pressure in June - Portsmouth, NH
  • Average pressure in June: 29.92"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in June
Portsmouth, NH

Average wind speed in June - Portsmouth, NH
  • Average wind speed in June: 7.4mph

The windiest month (with the highest average wind speed) is January (11.7mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

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Average humidity in June
Portsmouth, NH

Average humidity in June - Portsmouth, NH
  • Average humidity in June: 80%

The month with the highest relative humidity is June (80%).
The months with the lowest relative humidity are April and November (75%).

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Average rainfall in June
Portsmouth, NH

Average rainfall in June - Portsmouth, NH
  • Average rainfall in June: 2.6"

The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is September (1.54").

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Average rainfall days in June
Portsmouth, NH

Average rainfall days in June - Portsmouth, NH
  • Average rainfall days in June: 15 days

The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is January (7.5 days).

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Average snowfall in June
Portsmouth, NH

Average snowfall in June - Portsmouth, NH
  • Average snowfall in June: 0"

The month with the highest snowfall is January (4.02").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in June
Portsmouth, NH

Average snowfall days in June - Portsmouth, NH
  • Average snowfall days in June: 0 days

The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in June
Portsmouth, NH

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).

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Average daylight in June /
Average sunshine in June
Portsmouth, NH

Average daylight in June / Average sunshine in June - Portsmouth, NH
  • Average daylight in June: 15h and 2min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in June: 9h and 1min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

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Average sunshine days in June
Portsmouth, NH

Average sunshine days in June - Portsmouth, NH
  • Average sunshine days in June: 13.3 days

The month with the most sunshine days is September (16.8 days).
The month with the least sunshine days is April (13.2 days).

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Average UV index in June
Portsmouth, NH

Average UV index in June - Portsmouth, NH
  • Average UV index in June: 5

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in June
Portsmouth, NH

Average cloud cover in June - Portsmouth, NH
  • Average cloud cover in June: 40

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in June
Portsmouth, NH

Average visibility in June - Portsmouth, NH
  • Average visibility in June: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Portsmouth, New Hampshire, USA

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