Measurements:
°C
°F
CURRENT WEATHER
15:13
Nantucket
84°F
NE 11 mph
Feels like: 86°F
Precip: 4%
World Resorts USA Nantucket Weather

7 Day Weather Forecast

08.05
wed
DAY
82°F
NE 10 mph
precip
3%
NIGHT
74°F
NE 13 mph
precip
17%
08.06
thu
DAY
76°F
NE 15 mph
precip
17%
NIGHT
76°F
NE 17 mph
precip
17%
08.07
fri
DAY
76°F
NE 14 mph
precip
22%
NIGHT
76°F
NE 15 mph
precip
17%
08.08
sat
DAY
76°F
NE 16 mph
precip
17%
NIGHT
76°F
NE 20 mph
precip
25%
08.09
sun
DAY
76°F
NE 14 mph
precip
15%
NIGHT
78°F
NE 16 mph
precip
13%
08.10
mon
DAY
76°F
NE 15 mph
precip
19%
NIGHT
78°F
NE 17 mph
precip
58%
08.11
tue
DAY
76°F
NE 17 mph
precip
17%
NIGHT
72°F
W 8 mph
precip
14%

Nantucket Sea Water Temperature in August, °F

Select Year: 2025 2024 2023

The average sea surface temperature in August 2025 for Nantucket was 20.9°F. The maximum and minimum values were 19.8°F and 22.9°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:
July 73.9 °F
August 73.3 °F
September 69.0 °F
Warmest sea temperature:
August 74.4 °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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