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 in Nantucket, Massachusetts, is an agreeable summer month, with an average temperature ranging between max 70.5°F (21.4°C) and min 67.3°F (19.6°C).

Temperature

In July, the average high-temperature marginally rises from an enjoyable 62.6°F (17°C) in June to an agreeable 70.5°F (21.4°C). In July, the average low-temperature is 67.3°F (19.6°C).

Humidity

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

Rainfall

In Nantucket, it is raining for 13.4 days, with typically 1.81" (46mm) of accumulated precipitation. Throughout the year, there are 153 rainfall days, and 26.61" (676mm) of precipitation is accumulated.

Snowfall

In Nantucket, snow does not fall in April through October.

Ocean temperature

In July, the average ocean temperature in Nantucket is 64.9°F (18.3°C).
Note: For swimming, a surface water temperature of 64.9°F (18.3°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

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 5:34 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 in Nantucket.

UV index

The months with the highest UV index in Nantucket are July and August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 6 in July transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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.
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FAQ

What is the temperature in July in Nantucket?

In July, in Nantucket, 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?

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

What is the average humidity in July in Nantucket?

In Nantucket, Massachusetts, the average relative humidity in July is 86%.

How much does it rain in Nantucket in July?

In Nantucket, Massachusetts, during July, the rain falls for 13.4 days and regularly aggregates up to 1.81" (46mm) of precipitation.

When it does not snow in Nantucket?

In Nantucket, snow does not fall in April through October.

What is the ocean temperature in July in Nantucket?

In July, the average ocean temperature in Nantucket, Massachusetts, is 64.9°F (18.3°C). For most, swimming in 64.9°F (18.3°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

How many hours of daylight does Nantucket have in July?

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 in Nantucket, sunrise is at 5:11 am and sunset at 8:17 pm. On the last day of the month, sunrise is at 5:34 am and sunset at 7:58 pm EDT.

What is the month 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 long on average sun shines in July in Nantucket?

In July, the average sunshine duration in Nantucket, Massachusetts, is 10.7h.

When is the highest UV index in Nantucket?

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

What is the UV index reading in July in Nantucket?

In July, the average daily maximum UV index in Nantucket, Massachusetts, is 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJulyASOND
Jun
July
Aug
Average high temperature
62.6°F 17°C
70.5°F 21.4°C
72.1°F 22.3°C
Average low temperature
58.6°F 14.8°C
67.3°F 19.6°C
68.7°F 20.4°C
Average pressure
29.94" 760mmHg
29.96" 761mmHg
29.98" 761mmHg
Average wind speed
12.8mph 20.6km/h
11.9mph 19.2km/h
11.8mph 19km/h
Average max. wind speed
13.7mph 22km/h
12.6mph 20.3km/h
12.6mph 20.3km/h
Average wind speed gusts
23.3mph 37.5km/h
21.2mph 34.1km/h
19.1mph 30.7km/h
Average humidity
85%
86%
82%
Average rainfall
1.93" 49mm
1.81" 46mm
1.93" 49mm
Average rainfall days
13.9
13.4
12.9
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average sea temperature
57.1°F 13.9°C
64.9°F 18.3°C
67.6°F 19.8°C
Average daylight
15h 1min
14h 5min
13h 5min
Average sunshine
9h 4min
10h 4min
10h 4min
Average sunshine days
14.9
16.1
16.5
Average UV index
5
6
6
Average cloud cover
36%
29%
27%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

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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