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Monthly climate in Nantucket, Massachusetts, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Nantucket features a humid subtropical climate (Cfa).Temperatures typically range between 3 °C (38 °F) and 21 °C (70 °F) through the year, but rarely can drop to -13 °C (9 °F) or can rise to as high as 24 °C (76 °F).The average annual precipitation amounts to about 1369 mm (53.9 inches) and receives 128 rainy days on the 1 mm (0.04 inches) threshold annually.Nantucket enjoys an average of 2966 hours of sunshine throughout the year, and daylight varies from 9 hours 14 minutes to 15 hours 5 minutes per day.

Monthly average temperatures in Nantucket, Massachusetts, United States §

The warmest months in Nantucket are July, August and September, with daily mean temperatures ranging from 19 to 21 °C (66 - 70 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 3 to 4 °C (38 - 39 °F) throughout the day. On average each year, Nantucket experiences 0 days above 25 °C (77.0 °F) and 31 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Nantucket, Massachusetts, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 13°C
(55°F)		 13°C
(55°F)		 12°C
(53°F)		 13°C
(56°F)		 16°C
(62°F)		 21°C
(70°F)		 24°C
(76°F)		 24°C
(76°F)		 23°C
(73°F)		 22°C
(71°F)		 19°C
(66°F)		 16°C
(61°F)
Mean maximum 11°C
(53°F)		 11°C
(52°F)		 11°C
(51°F)		 13°C
(55°F)		 15°C
(60°F)		 19°C
(67°F)		 23°C
(74°F)		 23°C
(74°F)		 22°C
(71°F)		 21°C
(69°F)		 17°C
(63°F)		 14°C
(58°F)
Average high 5°C
(41°F)		 5°C
(42°F)		 6°C
(42°F)		 9°C
(48°F)		 12°C
(53°F)		 16°C
(61°F)		 20°C
(69°F)		 21°C
(71°F)		 20°C
(68°F)		 17°C
(62°F)		 12°C
(54°F)		 8°C
(46°F)
Daily mean 3°C
(38°F)		 3°C
(38°F)		 4°C
(39°F)		 7°C
(45°F)		 11°C
(51°F)		 15°C
(60°F)		 20°C
(67°F)		 21°C
(70°F)		 19°C
(66°F)		 15°C
(60°F)		 10°C
(50°F)		 5°C
(42°F)
Average low 1°C
(34°F)		 1°C
(34°F)		 2°C
(36°F)		 6°C
(43°F)		 10°C
(50°F)		 15°C
(58°F)		 19°C
(66°F)		 20°C
(68°F)		 18°C
(64°F)		 14°C
(58°F)		 8°C
(47°F)		 3°C
(39°F)
Mean minimum -9°C
(17°F)		 -7°C
(20°F)		 -5°C
(23°F)		 3°C
(37°F)		 6°C
(44°F)		 11°C
(52°F)		 16°C
(61°F)		 17°C
(63°F)		 15°C
(58°F)		 9°C
(48°F)		 -0°C
(32°F)		 -3°C
(26°F)
Minimum -13°C
(9°F)		 -10°C
(15°F)		 -7°C
(19°F)		 1°C
(34°F)		 5°C
(41°F)		 10°C
(50°F)		 15°C
(59°F)		 16°C
(62°F)		 13°C
(56°F)		 5°C
(41°F)		 -5°C
(24°F)		 -9°C
(16°F)

Compare climate in Nantucket with other places

Compare temperature, precipitation, sunshine, UV index in Nantucket, Massachusetts, United States with other places around the world.

Monthly average precipitation in Nantucket, Massachusetts, United States §

Nantucket usually has the most precipitation in May, October and December, with an average of 12 rainy days and 141 mm (5.6 inches) of precipitation per month.The driest months in Nantucket are January, June and July. On average, 81 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Nantucket, Massachusetts, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 96 (3.8) 127 (5.0) 114 (4.5) 127 (5.0) 130 (5.1) 83 (3.2) 64 (2.5) 98 (3.9) 122 (4.8) 162 (6.4) 115 (4.5) 132 (5.2)
Average precipitation days (≥ 1 mm) 10 13 11 12 12 10 8 8 10 12 10 12

Monthly sunshine hours in Nantucket, Massachusetts, United States §

The sunniest months in Nantucket are June, July and August, when the sun shines an average of 10 hours 44 minutes a day.Least sunny months in Nantucket: January, February and December receive an average of 5 hours 6 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Nantucket, Massachusetts, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 133 174 255 243 298 318 342 327 278 237 199 156
Mean daily daylight hours 9h 34m 10h 37m 11h 58m 13h 20m 14h 30m 15h 5m 14h 46m 13h 44m 12h 24m 11h 2m 9h 50m 9h 14m

Solar UV radiation in Nantucket, Massachusetts, United States §

Nantucket experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure.January, November and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Nantucket UV Index data.

Average daily maximum UV levels by month for Nantucket, Massachusetts, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 3 5 6 8 9 10 10 9 8 6 4 2