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Nantucket Weather

Nantucket 14 Days Forecast

25.08
tue

Day

77°F

E 19 mph

Precip.
5%

Night

68°F

E 14 mph

Precip.
10%

26.08
wed

Day

70°F

E 9 mph

Precip.
5%

Night

72°F

NE 13 mph

Precip.
23%

27.08
thu

Day

73°F

NE 11 mph

Precip.
24%

Night

72°F

N 17 mph

Precip.
64%

28.08
fri

Day

72°F

SE 1 mph

Precip.
14%

Night

73°F

E 14 mph

Precip.
29%

29.08
sat

Day

70°F

S 11 mph

Precip.
21%

Night

68°F

N 7 mph

Precip.
21%

30.08
sun

Day

72°F

NE 9 mph

Precip.
7%

Night

73°F

NE 4 mph

Precip.
36%

31.08
mon

Day

72°F

SE 9 mph

Precip.
11%

Night

70°F

NW 6 mph

Precip.
11%

01.09
tue

Day

72°F

N 14 mph

Precip.
25%

Night

72°F

NE 17 mph

Precip.
94%

02.09
wed

Day

66°F

NE 15 mph

Precip.
30%

Night

64°F

SW 7 mph

Precip.
25%

03.09
thu

Day

66°F

W 16 mph

Precip.
31%

Night

68°F

N 6 mph

Precip.
32%

04.09
fri

Day

66°F

NW 6 mph

Precip.
54%

Night

68°F

E 21 mph

Precip.
11%

05.09
sat

Day

64°F

E 7 mph

Precip.
29%

Night

66°F

SE 14 mph

Precip.
33%

06.09
sun

Day

64°F

SE 4 mph

Precip.
12%

Night

63°F

SW 12 mph

Precip.
13%

07.09
mon

Day

63°F

SW 19 mph

Precip.
19%

Night

61°F

SW 22 mph

Precip.
11%

sea water
temperature

Nantucket

monthly
weather

Nantucket

current
weather

Nantucket

7 days
forecast

Nantucket

January
February
March
April

May
June
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August

September
October
November
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Show year:

2026

2025

2024

The average sea water temperature in August of 2026 was 71.6°F. The highest and lowest sea temperatures during the month were 73.8°F and 67.6°F.

Show year:

2025

2024

2023

The average sea water temperature in September of 2025 was 67.7°F. The highest and lowest sea temperatures during the month were 69.4°F and 66.4°F.