May 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 May

Weather in Nantucket undergoes a significant change in May. Average high temperatures transition into the 50s, currently reaching 54.3°F (12.4°C). As the gateway month to the summer season, May sees grasslands turning greener and longer daylight hours that ring in a sense of warmth and renewal. With the temperature shift, the rainfall decreases compared to the spring months. It's the beginning of beach season in Nantucket, inviting residents and visitors alike to enjoy its seaside charm.

Temperature

May's onset brings a subtle temperature rise, moving from a frosty 47.5°F (8.6°C) in April to a cool 54.3°F (12.4°C). May nights in Nantucket cool to an average low-temperature of 50.5°F (10.3°C), a marginal decrease from its daytime equivalent.

Humidity

The average relative humidity in May is 85%.

Rainfall

In Nantucket, during May, the rain falls for 14.3 days and regularly aggregates up to 2.05" (52mm) of precipitation. Throughout the year, there are 153 rainfall days, and 26.61" (676mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

In May, the average ocean temperature is 50°F (10°C).
Note: Dipping into 50°F (10°C) below 50°F (10°C) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 55.4°F (13°C) can be jarring.

Daylight

In Nantucket, the average length of the day in May is 14h and 31min.
On the first day of May in Nantucket, sunrise is at 5:36 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 5:09 am and sunset at 8:06 pm EDT.

Sunshine

In Nantucket, the average sunshine in May is 8.5h.

UV index

In May, the average daily maximum UV index in Nantucket, Massachusetts, is 4. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 4 in May interprets into the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Around midday, solar radiation is most harmful; hence, exposure should be limited. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
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Frequently asked questions

What is the temperature in May in Nantucket?

In Nantucket, in May, the average high-temperature is 54.3°F (12.4°C), and the average low-temperature is 50.5°F (10.3°C).

What is the average humidity in May in Nantucket?

The average relative humidity in May in Nantucket is 85%.

How many days does it rain in May in Nantucket?

In Nantucket, in May, during 14.3 rainfall days, 2.05" (52mm) of precipitation is typically accumulated.

When it does not snow in Nantucket?

April through October are months without snowfall.

How cold is the water in May in Nantucket?

In Nantucket, Massachusetts, in May, the average water temperature is 50°F (10°C). Swimming in 50°F (10°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

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

In May, the average day length in Nantucket, Massachusetts, is 14h and 31min.

When are sunrise and sunset in May in Nantucket?

In May, on the first day of the month, sunrise is at 5:36 am and sunset at 7:38 pm. On the last day of the month, in Nantucket, sunrise is at 5:09 am and sunset at 8:06 pm EDT.

How long on average sun shines in May in Nantucket?

In Nantucket, the average sunshine duration in May is 8.5h.

What is the UV index reading in May in Nantucket?

In Nantucket, Massachusetts, the average daily maximum UV index in May is 4. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMayJJASOND
Apr
May
Jun
Average high temperature
47.5°F 8.6°C
54.3°F 12.4°C
62.6°F 17°C
Average low temperature
42.8°F 6°C
50.5°F 10.3°C
58.6°F 14.8°C
Average pressure
29.98" 761mmHg
30.02" 763mmHg
29.94" 760mmHg
Average wind speed
16mph 25.7km/h
13.9mph 22.4km/h
12.8mph 20.6km/h
Average max. wind speed
17.1mph 27.5km/h
14.9mph 24km/h
13.7mph 22km/h
Average wind speed gusts
27.2mph 43.8km/h
25.4mph 40.9km/h
23.3mph 37.5km/h
Average humidity
80%
85%
85%
Average rainfall
2.52" 64mm
2.05" 52mm
1.93" 49mm
Average rainfall days
14.1
14.3
13.9
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0.3
0
0
Average sea temperature
44°F 6.7°C
49.9°F 9.9°C
57.1°F 13.9°C
Average daylight
13h 2min
14h 3min
15h 1min
Average sunshine
8h 2min
8h 3min
9h 4min
Average sunshine days
13.3
14.8
14.9
Average UV index
3
4
5
Average cloud cover
45%
44%
36%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in May
Nantucket, MA

Average temperature in May - Nantucket, MA
  • Average high temperature in May: 54.3°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 May: 50.5°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 May
Nantucket, MA

Average pressure in May - Nantucket, MA
  • Average pressure in May: 30.02"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 May
Nantucket, MA

Average wind speed in May - Nantucket, MA
  • Average wind speed in May: 13.9mph

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 May
Nantucket, MA

Average humidity in May - Nantucket, MA
  • Average humidity in May: 85%

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 May
Nantucket, MA

Average rainfall in May - Nantucket, MA
  • Average rainfall in May: 2.05"

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 May
Nantucket, MA

Average rainfall days in May - Nantucket, MA
  • Average rainfall days in May: 14.3 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 May
Nantucket, MA

Average snowfall in May - Nantucket, MA
  • Average snowfall in May: 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 May
Nantucket, MA

Average snowfall days in May - Nantucket, MA
  • Average snowfall days in May: 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 May
Nantucket, MA

Average sea temperature in May - Nantucket, MA
  • Average sea temperature in May: 49.9°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 May /
Average sunshine in May
Nantucket, MA

Average daylight in May / Average sunshine in May - Nantucket, MA
  • Average daylight in May: 14h and 3min

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 May: 8h and 3min

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 May
Nantucket, MA

Average sunshine days in May - Nantucket, MA
  • Average sunshine days in May: 14.8 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 May
Nantucket, MA

Average UV index in May - Nantucket, MA
  • Average UV index in May: 4

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 May
Nantucket, MA

Average cloud cover in May - Nantucket, MA
  • Average cloud cover in May: 44

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 May
Nantucket, MA

Average visibility in May - Nantucket, MA
  • Average visibility in May: 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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