July weather forecast
Nantucket, MA

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Beautiful homes built on the water overlooking the boats on the water below, in Nantucket, Massachusetts
Beautiful homes built on the water overlooking the boats on the water below, in Nantucket, Massachusetts

Weather in July

July is the pinnacle of the summer season in Nantucket, witnessing the highest average temperature of the year, which reaches 70.5°F (21.4°C). Swimming and sunbathing dominate popular activities with the temperature of the sea reaching a welcoming warmth. Being the sunniest month, July experiences the most sunshine hours, creating exceptional conditions for all kinds of outdoor activities. Despite high temperatures, July also sees a slight boost in rainfall from its predecessor. Importantly, Nantucket's annual weather offers its warmest greetings in July.

Temperature

July in Nantucket signifies a subtle uplift in the average high-temperature, adjusting from a comfortable 62.6°F (17°C) in June to an agreeable 70.5°F (21.4°C). Nantucket's July nights exhibit a subtle drop in temperature, averaging at a comfortable 67.3°F (19.6°C), closely aligned with the daytime highs.

Humidity

July is the most humid month in Nantucket, with an average relative humidity of 86%.

Rainfall

In Nantucket, in July, during 13.4 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Nantucket, during the entire year, the rain falls for 153 days and collects up to 26.61" (676mm) of precipitation.

Snowfall

April through October are months without snowfall.

Ocean temperature

In Nantucket, the average seawater temperature in July is 64.9°F (18.3°C).
Note: Swimming is not a pleasurable activity for the majority in water at 64.9°F (18.3°C). Breathing control gets harder as the water temperature dips from 69.8°F (21°C) to 59°F (15°C).

Daylight

In Nantucket, the average length of the day in July is 14h and 49min.
On the first day of the month, sunrise is at 5:11 am and sunset at 8:17 pm. On the last day of July, sunrise is at 5:35 am and sunset at 7:58 pm EDT.

Sunshine

July and August, with an average of 10.7h of sunshine, are months with the most 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 value of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for the average person.
Note: During July, 6 as the daily maximum UV index converts into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
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Frequently asked questions

What are July temperatures in Nantucket?

In Nantucket, in July, the average high-temperature is 70.5°F (21.4°C), and the average low-temperature is 67.3°F (19.6°C).

What is the most humid month in Nantucket?

The most humid month is July, with an average relative humidity of 86%.

What is the average humidity in July in Nantucket?

In July, the average relative humidity is 86%.

How many days does it rain in July in Nantucket?

In July, the rain falls for 13.4 days. Throughout July, 1.81" (46mm) of precipitation is accumulated.

When it does not snow in Nantucket?

April through October are months without snowfall in Nantucket.

How cold is the water in July in Nantucket?

In July, the average ocean temperature in Nantucket is 64.9°F (18.3°C). Swimming in 64.9°F (18.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

What is the average length of the day in July in Nantucket?

The average day length in July in Nantucket, Massachusetts, is 14h and 49min.

When are sunrise and sunset in July in Nantucket?

On the first day of July, sunrise is at 5:11 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 5:35 am and sunset at 7:58 pm EDT.

What are the months with the most sunshine in Nantucket?

The months with the most sunshine in Nantucket, Massachusetts, are July and August, with an average of 10.7h of sunshine.

How many hours of sunshine does Nantucket have in July?

The average sunshine duration in July is 10.7h.

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

The months with the highest UV index in Nantucket are July and August, with an average maximum UV index of 6.

What is the UV index intensity in July in Nantucket?

The average daily maximum UV index in July is 6. A UV Index reading of 6 to 7 represents a high hazard to health from unsafe exposure to Sun's UV rays.
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 July
Nantucket, MA

Average temperature in July - Nantucket, MA
  • Average high temperature in July: 70.5°F

The warmest month (with the highest average high temperature) is August (72.1°F).
The month with the lowest average high temperature is February (39.7°F).

  • Average low temperature in July: 67.3°F

The month with the highest average low temperature is August (68.7°F).
The coldest month (with the lowest average low temperature) is February (32.5°F).

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Average pressure in July
Nantucket, MA

Average pressure in July - Nantucket, MA
  • Average pressure in July: 29.96"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in July
Nantucket, MA

Average wind speed in July - Nantucket, MA
  • Average wind speed in July: 11.9mph

The windiest month (with the highest average wind speed) is January (18.5mph).
The calmest month (with the lowest average wind speed) is August (11.8mph).

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Average humidity in July
Nantucket, MA

Average humidity in July - Nantucket, MA
  • Average humidity in July: 86%

The month with the highest relative humidity is July (86%).
The months with the lowest relative humidity are January, November and December (75%).

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Average rainfall in July
Nantucket, MA

Average rainfall in July - Nantucket, MA
  • Average rainfall in July: 1.81"

The wettest month (with the highest rainfall) is October (3.27").
The driest month (with the least rainfall) is November (1.77").

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Average rainfall days in July
Nantucket, MA

Average rainfall days in July - Nantucket, MA
  • Average rainfall days in July: 13.4 days

The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is February (9.2 days).

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Average snowfall in July
Nantucket, MA

Average snowfall in July - Nantucket, MA
  • Average snowfall in July: 0"

The month with the highest snowfall is January (1.06").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in July
Nantucket, MA

Average snowfall days in July - Nantucket, MA
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is January (5.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in July
Nantucket, MA

Average sea temperature in July - Nantucket, MA
  • Average sea temperature in July: 64.9°F

The best month for swimming (with the highest average sea temperature) is August (67.6°F).
The coldest month (with the lowest average sea temperature) is February (37.9°F).

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Average daylight in July /
Average sunshine in July
Nantucket, MA

Average daylight in July / Average sunshine in July - Nantucket, MA
  • Average daylight in July: 14h and 5min

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

  • Average sunshine in July: 10h and 4min

The months with the most sunshine are July and August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).

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Average sunshine days in July
Nantucket, MA

Average sunshine days in July - Nantucket, MA
  • Average sunshine days in July: 16.1 days

The month with the most sunshine days is August (16.5 days).
The month with the least sunshine days is January (11.3 days).

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Average UV index in July
Nantucket, MA

Average UV index in July - Nantucket, MA
  • 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 and December (UV index 2).

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Average cloud cover in July
Nantucket, MA

Average cloud cover in July - Nantucket, MA
  • Average cloud cover in July: 29

The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in July
Nantucket, MA

Average visibility in July - Nantucket, MA
  • 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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Nantucket, Massachusetts, USA

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