25.08
tue
tue
Day
77°F
E 19 mph
Precip.
5%
5%
Night
68°F
E 14 mph
Precip.
10%
10%
26.08
wed
wed
Day
70°F
E 9 mph
Precip.
5%
5%
Night
72°F
NE 13 mph
Precip.
23%
23%
27.08
thu
thu
Day
73°F
NE 11 mph
Precip.
24%
24%
Night
72°F
N 17 mph
Precip.
64%
64%
28.08
fri
fri
Day
72°F
SE 1 mph
Precip.
14%
14%
Night
73°F
E 14 mph
Precip.
29%
29%
29.08
sat
sat
Day
70°F
S 11 mph
Precip.
21%
21%
Night
68°F
N 7 mph
Precip.
21%
21%
30.08
sun
sun
Day
72°F
NE 9 mph
Precip.
7%
7%
Night
73°F
NE 4 mph
Precip.
36%
36%
31.08
mon
mon
Day
72°F
SE 9 mph
Precip.
11%
11%
Night
70°F
NW 6 mph
Precip.
11%
11%
sea water
temperature
temperature
| Nantucket |
monthly
weather
weather
| Nantucket |
current
weather
weather
| Nantucket |
14 days
forecast
forecast
| Nantucket |
Sea water temperature in August, °F
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.
Sea water temperature in September, °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.
Air temperature in Nantucket, °F
Precipitation total in Nantucket, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Nantucket
Nantucket on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Nantucket
Local time: 16:54
August 25, tuesday
1800
77°F
NE
19 mph
19 mph
2100
70°F
E
19 mph
19 mph
August 26, wednesday
0000
68°F
E
14 mph
14 mph
0300
70°F
E
14 mph
14 mph
0600
70°F
E
12 mph
12 mph
0900
68°F
SE
13 mph
13 mph
1200
70°F
E
9 mph
9 mph
1500
70°F
E
9 mph
9 mph
