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

July 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
July is a moderately hot summer month in Portsmouth, New Hampshire, with average temperature fluctuating between 61°F (16.1°C) and 79°F (26.1°C).

Temperature

With an average high-temperature of 79°F (26.1°C) and an average low-temperature of 61°F (16.1°C), July is the warmest month.

Rainfall

In Portsmouth, in July, during 10 rainfall days, 3" (77mm) of precipitation is typically accumulated. Throughout the year, there are 125 rainfall days, and 42.4" (1078mm) of precipitation is accumulated.

Ocean temperature

In Portsmouth, the average water temperature is 63.1°F (17.3°C). For swimming, a surface water temperature of 63.1°F (17.3°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

In Portsmouth, the average length of the day in July is 15h.

Sunshine

Months with the most sunshine in Portsmouth 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 estimate of 8 to 10 represents a very high health hazard from the exposure to the Sun's UV rays for ordinary individuals.
In July, the average maximum UV index of 8 translate into the following recommendations:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the warmest month in Portsmouth?

The warmest month in Portsmouth is July, with an average high-temperature of 79°F (26.1°C) and an average low-temperature of 61°F (16.1°C).

What is the temperature in July in Portsmouth?

In Portsmouth, New Hampshire, in July, the average high-temperature is 79°F (26.1°C), and the average low-temperature is 61°F (16.1°C).

How much does it rain in Portsmouth in July?

In Portsmouth, in July, it is raining for 10 days, with typically 3" (77mm) of accumulated precipitation.

What is the ocean temperature in July in Portsmouth?

In July, the average ocean temperature is 63.1°F (17.3°C). Swimming in 63.1°F (17.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Portsmouth have in July?

The average length of the day in July is 15h.

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 long on average sun shines in July in Portsmouth?

The average sunshine in July in Portsmouth, New Hampshire, is 9h.

When is 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, New Hampshire.

What is the UV index intensity in July in Portsmouth?

In Portsmouth, New Hampshire, the average daily maximum UV index in July is 8. A UV Index estimate of 8 to 10 represents a very high health vulnerability from unprotected exposure to the UV radiation.
Average temperature in July - Portsmouth, NH
  • Average high temperature in July: 79°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 July: 61°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 July - Portsmouth, NH
  • Average rainfall in July: 3"

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 July - Portsmouth, NH
  • Average rainfall days in July: 10 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 July - Portsmouth, NH
  • Average sea temperature in July: 63.1°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 July / Average sunshine in July - Portsmouth, NH
  • Average daylight in July: 15h

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 July: 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 July - Portsmouth, NH
  • Average UV index in July: 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).