14.09
mon
mon
Day
68°F
S 22 mph
Precip.
20%
20%
Night
64°F
S 22 mph
Precip.
3%
3%
15.09
tue
tue
Day
63°F
SW 13 mph
Precip.
5%
5%
Night
61°F
NW 6 mph
Precip.
14%
14%
16.09
wed
wed
Day
63°F
N 9 mph
Precip.
6%
6%
Night
68°F
NE 12 mph
Precip.
7%
7%
17.09
thu
thu
Day
70°F
NE 9 mph
Precip.
10%
10%
Night
70°F
NE 15 mph
Precip.
16%
16%
18.09
fri
fri
Day
66°F
SW 18 mph
Precip.
6%
6%
Night
63°F
SW 18 mph
Precip.
6%
6%
19.09
sat
sat
Day
63°F
SW 19 mph
Precip.
5%
5%
Night
61°F
W 14 mph
Precip.
15%
15%
20.09
sun
sun
Day
61°F
NW 6 mph
Precip.
9%
9%
Night
63°F
N 8 mph
Precip.
68%
68%
sea water
temperature
temperature
| Nantucket |
monthly
weather
weather
| Nantucket |
current
weather
weather
| Nantucket |
14 days
forecast
forecast
| Nantucket |
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: 17:07
September 14, monday
1800
68°F
S
21 mph
21 mph
2100
66°F
S
16 mph
16 mph
September 15, tuesday
0000
64°F
S
22 mph
22 mph
0300
64°F
SW
19 mph
19 mph
0600
63°F
SW
19 mph
19 mph
0900
63°F
SW
16 mph
16 mph
1200
63°F
SW
13 mph
13 mph
1500
63°F
SW
14 mph
14 mph
