Measurements:
°C
°F
CURRENT WEATHER
14:26
Nantucket
86°F
E 22 mph
Feels like: 94°F
Precip: 7%
World Resorts USA Nantucket Weather

7 Day Weather Forecast

07.15
wed
DAY
88°F
E 22 mph
precip
6%
NIGHT
74°F
S 4 mph
precip
5%
07.16
thu
DAY
76°F
NE 16 mph
precip
8%
NIGHT
76°F
S 5 mph
precip
6%
07.17
fri
DAY
76°F
S 4 mph
precip
3%
NIGHT
74°F
NE 15 mph
precip
6%
07.18
sat
DAY
74°F
NE 19 mph
precip
11%
NIGHT
76°F
NE 31 mph
precip
21%
07.19
sun
DAY
76°F
NE 28 mph
precip
26%
NIGHT
76°F
NE 7 mph
precip
5%
07.20
mon
DAY
74°F
E 7 mph
precip
3%
NIGHT
74°F
NE 14 mph
precip
8%
07.21
tue
DAY
76°F
N 24 mph
precip
29%
NIGHT
74°F
E 16 mph
precip
14%

Nantucket Sea Water Temperature in July, °F

Select Year: 2026 2025 2024

The average sea surface temperature in July 2026 for Nantucket was 20.7°F. The maximum and minimum values were 19.3°F and 22.1°F respectively.

Nantucket on the Weather Map

Best Time to Visit Nantucket
The most sunny months:
June 14 days
October 13 days
September 13 days
The most warm months:
August 73.3 °F
July 72.9 °F
September 69.0 °F
Warmest sea temperature:
August 74.4 °F
July 72.4 °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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