July 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 July

July hotfoot it as the warmest month in Portsmouth, tapping into the rhythm of high summer. The bright sunny days are indulgent, befitting for a range of outdoor activities. A soothing sea breeze making the hot days manageable, the need for a summer hat goes without saying. The sea temperature balmy at 63.1°F (17.3°C) making July the ideal period for swimming and other water pursuits. Despite the high temperatures, cloudy days remain at bay, resulting in lower rainfall as compared to June.

Temperature

July is the month when Portsmouth experiences its warmest temperatures, averaging a high of 76.3°F (24.6°C) and a low of 62.6°F (17°C).

Humidity

The average relative humidity in July in Portsmouth is 79%.

Rainfall

In Portsmouth, during July, the rain falls for 14.1 days and regularly aggregates up to 2.17" (55mm) of precipitation. In Portsmouth, New Hampshire, during the entire year, the rain falls for 144.2 days and collects up to 27.48" (698mm) of precipitation.

Snowfall

May through September are months without snowfall in Portsmouth.

Ocean temperature

In Portsmouth, in July, the average water temperature is 63.1°F (17.3°C).
Note: For most individuals, swimming in 63.1°F (17.3°C) is not enjoyable. As the water temperature decreases from 69.8°F (21°C) to 59°F (15°C), breathing control becomes increasingly difficult.

Daylight

In July, the average length of the day is 14h and 59min.
On the first day of July, sunrise is at 5:07 am and sunset at 8:26 pm. On the last day of the month, sunrise is at 5:33 am and sunset at 8:05 pm EDT.

Sunshine

The average sunshine in July is 10.3h.

UV index

The months with the highest UV index are July and August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 6 in July translates into these instructions:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. To cut down UV radiation exposure by about half, sport a wide-brim hat.
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Frequently asked questions

What is the warmest month in Portsmouth?

July temperatures in Portsmouth, New Hampshire, tend to peak at an average high of 76.3°F (24.6°C) and dip to a low of 62.6°F (17°C).

What is the usual temperature for Portsmouth in July?

An average high-temperature, in July, in Portsmouth, is 76.3°F (24.6°C) and the average low-temperature is 62.6°F (17°C).

What is the average humidity in July in Portsmouth?

In Portsmouth, New Hampshire, the average relative humidity in July is 79%.

How much does it rain in Portsmouth in July?

In Portsmouth, during July, the rain falls for 14.1 days and regularly aggregates up to 2.17" (55mm) of precipitation.

When it does not snow in Portsmouth?

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

How cold is the water in July in Portsmouth?

In July, the average ocean temperature in Portsmouth, New Hampshire, 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).

How many hours of daylight does Portsmouth have in July?

The average day length in July in Portsmouth is 14h and 59min.

When are sunrise and sunset in July in Portsmouth?

In July, on the first day of the month, sunrise is at 5:07 am and sunset at 8:26 pm. On the last day of the month, sunrise is at 5:33 am and sunset at 8:05 pm EDT.

How many hours of sunshine does Portsmouth have in July?

In July, the average sunshine duration in Portsmouth is 10.3h.

What are the months with the highest UV index in Portsmouth?

July and August, with an average maximum UV index of 6, are months with the highest UV index in Portsmouth, New Hampshire.

What is the UV index reading in July in Portsmouth?

In Portsmouth, the average daily maximum UV index in July is 6. A UV Index value of 6 to 7 symbolizes a high health threat from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJulyASOND
Jun
July
Aug
Average high temperature
69.3°F 20.7°C
76.3°F 24.6°C
75.7°F 24.3°C
Average low temperature
55.4°F 13°C
62.6°F 17°C
61.7°F 16.5°C
Average pressure
29.92" 760mmHg
29.94" 760mmHg
29.97" 761mmHg
Average wind speed
7.4mph 11.9km/h
6.6mph 10.6km/h
6.7mph 10.8km/h
Average max. wind speed
8mph 12.9km/h
7.1mph 11.4km/h
7.3mph 11.7km/h
Average wind speed gusts
12.7mph 20.4km/h
11.6mph 18.7km/h
11.4mph 18.3km/h
Average humidity
80%
79%
79%
Average rainfall
2.6" 66mm
2.17" 55mm
2.09" 53mm
Average rainfall days
15
14.1
12.8
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average sea temperature
55.9°F 13.3°C
63.1°F 17.3°C
65.6°F 18.7°C
Average daylight
15h 2min
15h 0min
13h 5min
Average sunshine
9h 1min
10h 2min
10h 4min
Average sunshine days
13.3
14.8
15.5
Average UV index
5
6
6
Average cloud cover
40%
32%
29%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in July
Portsmouth, NH

Average temperature in July - Portsmouth, NH
  • Average high temperature in July: 76.3°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 July: 62.6°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 July
Portsmouth, NH

Average pressure in July - Portsmouth, NH
  • Average pressure in July: 29.94"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 July
Portsmouth, NH

Average wind speed in July - Portsmouth, NH
  • Average wind speed in July: 6.6mph

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 July
Portsmouth, NH

Average humidity in July - Portsmouth, NH
  • Average humidity in July: 79%

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 July
Portsmouth, NH

Average rainfall in July - Portsmouth, NH
  • Average rainfall in July: 2.17"

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 July
Portsmouth, NH

Average rainfall days in July - Portsmouth, NH
  • Average rainfall days in July: 14.1 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 July
Portsmouth, NH

Average snowfall in July - Portsmouth, NH
  • Average snowfall in July: 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 July
Portsmouth, NH

Average snowfall days in July - Portsmouth, NH
  • Average snowfall days in July: 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 July
Portsmouth, NH

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).

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

Average daylight in July / Average sunshine in July - Portsmouth, NH
  • Average daylight in July: 15h and 0min

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 July: 10h and 2min

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 July
Portsmouth, NH

Average sunshine days in July - Portsmouth, NH
  • Average sunshine days in July: 14.8 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 July
Portsmouth, NH

Average UV index in July - Portsmouth, NH
  • Average UV index in July: 6

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 July
Portsmouth, NH

Average cloud cover in July - Portsmouth, NH
  • Average cloud cover in July: 32

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 July
Portsmouth, NH

Average visibility in July - Portsmouth, NH
  • Average visibility in July: 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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