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Monthly climate in Wellfleet, Massachusetts, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Wellfleet features a humid subtropical climate (Cfa). Temperatures typically range between 2 °C (37 °F) and 21 °C (70 °F) through the year, but rarely can drop to -12 °C (11 °F) or can rise to as high as 26 °C (79 °F). The average annual precipitation amounts to about 1328 mm (52.3 inches) and receives 128 rainy days on the 1 mm (0.04 inches) threshold annually. Wellfleet enjoys an average of 2953 hours of sunshine throughout the year, and daylight varies from 9 hours 9 minutes to 15 hours 10 minutes per day.

Monthly average temperatures in Wellfleet, Massachusetts, United States §

The warmest months in Wellfleet 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 2 to 3 °C (37 - 38 °F) throughout the day. On average each year, Wellfleet experiences 1 days above 25 °C (77.0 °F) and 38 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Wellfleet, 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 12°C
(54°F)		 12°C
(53°F)		 12°C
(54°F)		 14°C
(58°F)		 18°C
(65°F)		 23°C
(73°F)		 26°C
(79°F)		 26°C
(79°F)		 24°C
(76°F)		 21°C
(70°F)		 18°C
(65°F)		 15°C
(60°F)
Mean maximum 11°C
(52°F)		 10°C
(50°F)		 10°C
(51°F)		 12°C
(54°F)		 17°C
(63°F)		 20°C
(69°F)		 24°C
(76°F)		 25°C
(77°F)		 23°C
(73°F)		 20°C
(68°F)		 17°C
(62°F)		 14°C
(57°F)
Average high 5°C
(41°F)		 5°C
(41°F)		 5°C
(42°F)		 8°C
(47°F)		 12°C
(54°F)		 17°C
(63°F)		 21°C
(70°F)		 22°C
(72°F)		 20°C
(67°F)		 16°C
(61°F)		 11°C
(52°F)		 7°C
(44°F)
Daily mean 2°C
(37°F)		 2°C
(37°F)		 3°C
(38°F)		 7°C
(44°F)		 11°C
(51°F)		 16°C
(61°F)		 20°C
(69°F)		 21°C
(70°F)		 19°C
(66°F)		 15°C
(58°F)		 9°C
(48°F)		 5°C
(41°F)
Average low 0°C
(33°F)		 1°C
(33°F)		 2°C
(35°F)		 6°C
(42°F)		 10°C
(50°F)		 15°C
(59°F)		 19°C
(67°F)		 20°C
(69°F)		 18°C
(64°F)		 13°C
(56°F)		 7°C
(45°F)		 3°C
(37°F)
Mean minimum -9°C
(17°F)		 -8°C
(19°F)		 -6°C
(21°F)		 2°C
(35°F)		 6°C
(43°F)		 11°C
(52°F)		 16°C
(62°F)		 17°C
(63°F)		 14°C
(58°F)		 8°C
(47°F)		 -1°C
(30°F)		 -4°C
(24°F)
Minimum -12°C
(11°F)		 -11°C
(13°F)		 -8°C
(17°F)		 0°C
(33°F)		 4°C
(40°F)		 10°C
(50°F)		 16°C
(60°F)		 16°C
(61°F)		 13°C
(56°F)		 4°C
(40°F)		 -7°C
(20°F)		 -10°C
(15°F)

Compare climate in Wellfleet with other places

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

Monthly average precipitation in Wellfleet, Massachusetts, United States §

Wellfleet usually has the most precipitation in April, October and December, with an average of 12 rainy days and 143 mm (5.6 inches) of precipitation per month. The driest months in Wellfleet are June, July and August. On average, 82 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Wellfleet, 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) 95 (3.7) 117 (4.6) 119 (4.7) 130 (5.1) 106 (4.2) 88 (3.5) 84 (3.3) 74 (2.9) 110 (4.3) 161 (6.3) 105 (4.2) 138 (5.4)
Average precipitation days (≥ 1 mm) 11 12 11 12 11 10 8 7 10 11 12 13

Monthly sunshine hours in Wellfleet, Massachusetts, United States §

The sunniest months in Wellfleet are June, July and August, when the sun shines an average of 10 hours 44 minutes a day. Least sunny months in Wellfleet: January, February and December receive an average of 5 hours 13 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Wellfleet, 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 136 180 251 239 292 321 339 327 276 228 200 158
Mean daily daylight hours 9h 30m 10h 35m 11h 58m 13h 22m 14h 34m 15h 10m 14h 50m 13h 46m 12h 25m 11h 1m 9h 47m 9h 9m

Solar UV radiation in Wellfleet, Massachusetts, United States §

Wellfleet experiences the highest level of ultraviolet (UV) radiation in May, June and August, when the maximum UV index can reach values of 9 - 10, which corresponds to the Very High category of sun exposure. January, February 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 Wellfleet UV Index data.

Average daily maximum UV levels by month for Wellfleet, 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) 2 4 5 8 9 10 9 9 8 6 4 2

Detailed Monthly Weather Insights for Wellfleet, Massachusetts, United States

Discover in-depth weather details for every month in Wellfleet. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Wellfleet's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.