Contents
- Weather in August
- Frequently asked questions
- Average temperature in August
- Average pressure in August
- Average wind speed in August
- Average humidity in August
- Average rainfall in August
- Average rainfall days in August
- Average snowfall in August
- Average snowfall days in August
- Average sea temperature in August
- Average daylight in August
- Average sunshine in August
- Average sunshine days in August
- Average UV index in August
- Average cloud cover in August
- Average visibility in August
Weather in August
Temperature
During August, Portsmouth records an average high-temperature of a still warm 75.7°F (24.3°C), marking a slight divergence from July's 76.3°F (24.6°C). An average low-temperature of 61.7°F (16.5°C) is observed during the August nights.Humidity
The average relative humidity in August is 79%.Rainfall
In Portsmouth, during August, the rain falls for 12.8 days and regularly aggregates up to 2.09" (53mm) of precipitation. In Portsmouth, during the entire year, the rain falls for 144.2 days and collects up to 27.48" (698mm) of precipitation.Snowfall
In Portsmouth, snow does not fall in May through September.Ocean temperature
With an average ocean temperature of 65.7°F (18.7°C), August is the month with the warmest seawater.Note: For the majority, swimming in 65.7°F (18.7°C) does not offer a pleasant experience. Below 69.8°F (21°C), the difficulty in controlling breathing escalates.
Daylight
In Portsmouth, the average length of the day in August is 13h and 53min.On the first day of August, sunrise is at 5:34 am and sunset at 8:04 pm. On the last day of the month, sunrise is at 6:07 am and sunset at 7:19 pm EDT.
Sunshine
The month with the most sunshine is August, with an average of 10.6h of sunshine.UV index
The months with the highest UV index are July and August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily maximum UV index of 6 in August interprets into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Portsmouth in August?
What is the average humidity in August?
How many days does it rain in August?
When it does not snow in Portsmouth?
What month is the ocean warmest?
How cold is the water in August?
How many hours of daylight does Portsmouth have in August?
When are sunrise and sunset in August?
What month has the most sunshine?
How many hours of sunshine does Portsmouth have in August?
What are the months with the highest UV index?
What is the UV index reading in August?
Average temperature in August
Portsmouth, NH
- Average high temperature in August: 75.7°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 August: 61.7°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).
Average pressure in August
Portsmouth, NH
- Average pressure in August: 29.97"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).
Average wind speed in August
Portsmouth, NH
- Average wind speed in August: 6.7mph
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).
Average humidity in August
Portsmouth, NH
- Average humidity in August: 79%
The month with the highest relative humidity is June (80%).
The months with the lowest relative humidity are April and November (75%).
Average rainfall in August
Portsmouth, NH
- Average rainfall in August: 2.09"
The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in August
Portsmouth, NH
- Average rainfall days in August: 12.8 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).
Average snowfall in August
Portsmouth, NH
- Average snowfall in August: 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").
Average snowfall days in August
Portsmouth, NH
- Average snowfall days in August: 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).
Average sea temperature in August
Portsmouth, NH
- Average sea temperature in August: 65.6°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 August /
Average sunshine in August
Portsmouth, NH
- Average daylight in August: 13h and 5min
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 August: 10h and 4min
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).
Average sunshine days in August
Portsmouth, NH
- Average sunshine days in August: 15.5 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).
Average UV index in August
Portsmouth, NH
- Average UV index in August: 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).
Average cloud cover in August
Portsmouth, NH
- Average cloud cover in August: 29
The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in August
Portsmouth, NH
- Average visibility in August: 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).
Portsmouth, New Hampshire, USA
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