Measurements:
°C
°F
CURRENT WEATHER
09:40
Nantucket
64°F
SW 16 mph
Feels like: 64°F
Precip: 5%
World Resorts USA Nantucket Weather

7 Day Weather Forecast

09.15
tue
DAY
64°F
SW 15 mph
precip
5%
NIGHT
62°F
W 7 mph
precip
11%
09.16
wed
DAY
64°F
NE 7 mph
precip
8%
NIGHT
68°F
NE 12 mph
precip
6%
09.17
thu
DAY
70°F
N 13 mph
precip
8%
NIGHT
72°F
NE 17 mph
precip
71%
09.18
fri
DAY
68°F
SW 19 mph
precip
8%
NIGHT
68°F
SW 11 mph
precip
18%
09.19
sat
DAY
64°F
W 11 mph
precip
5%
NIGHT
68°F
N 21 mph
precip
15%
09.20
sun
DAY
72°F
NE 22 mph
precip
53%
NIGHT
66°F
SW 17 mph
precip
12%
09.21
mon
DAY
64°F
SW 14 mph
precip
22%
NIGHT
62°F
SW 17 mph
precip
18%

Nantucket Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Nantucket was 21.1°F. The maximum and minimum values were 19.6°F and 22.4°F respectively.

Nantucket on the Weather Map

Best Time to Visit Nantucket
The most sunny months:
June 14 days
September 13 days
October 13 days
The most warm months:
August 74.1 °F
July 73.9 °F
September 69.0 °F
Warmest sea temperature:
August 74.3 °F
July 72.3 °F
September 70.6 °F
The most cold months:
February 34.6 °F
January 34.9 °F
March 39.7 °F
The most rainy months:
October 4 days
January 3 days
December 3 days
The most windy months:
January 19 mph
March 19 mph
December 19 mph
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