World Resorts USA Nantucket Weather

Nantucket 14 Days Forecast

14.09
mon
Day
68°F
S 22 mph
Precip.
20%
Night
64°F
S 22 mph
Precip.
3%
15.09
tue
Day
63°F
SW 13 mph
Precip.
5%
Night
61°F
NW 6 mph
Precip.
14%
16.09
wed
Day
63°F
N 9 mph
Precip.
6%
Night
68°F
NE 12 mph
Precip.
7%
17.09
thu
Day
70°F
NE 9 mph
Precip.
10%
Night
70°F
NE 15 mph
Precip.
16%
18.09
fri
Day
66°F
SW 18 mph
Precip.
6%
Night
63°F
SW 18 mph
Precip.
6%
19.09
sat
Day
63°F
SW 19 mph
Precip.
5%
Night
61°F
W 14 mph
Precip.
15%
20.09
sun
Day
61°F
NW 6 mph
Precip.
9%
Night
63°F
N 8 mph
Precip.
68%
21.09
mon
Day
59°F
SW 31 mph
Precip.
38%
Night
59°F
W 27 mph
Precip.
16%
22.09
tue
Day
59°F
W 20 mph
Precip.
17%
Night
61°F
W 22 mph
Precip.
68%
23.09
wed
Day
61°F
SW 34 mph
Precip.
86%
Night
61°F
SW 44 mph
Precip.
87%
24.09
thu
Day
61°F
SW 47 mph
Precip.
83%
Night
61°F
S 43 mph
Precip.
21%
25.09
fri
Day
61°F
S 29 mph
Precip.
5%
Night
64°F
E 21 mph
Precip.
7%
26.09
sat
Day
66°F
E 20 mph
Precip.
12%
Night
68°F
E 12 mph
Precip.
19%
27.09
sun
Day
68°F
E 12 mph
Precip.
15%
Night
68°F
N 16 mph
Precip.
10%

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

Sunniest months:
June 14 days
September 13 days
October 13 days
Warmest months:
August 71.7 °F
July 71.5 °F
September 67.1 °F
Warmest sea temp:
August 71.9 °F
July 70.0 °F
September 68.5 °F
Coldest months:
February 36.1 °F
January 36.4 °F
March 40.7 °F
Rainiest months:
October 4 days
January 3 days
December 3 days
Windiest months:
January 19.0 mph
March 19.0 mph
December 18.9 mph

Nantucket on a weather map

Current weather
16:54
Nantucket
+68°F
S 21 mph
Feels like: +68°F
Precip.: 3%
Places in USA:
Name
°F
Boston
+68°F
Washington
+75°F
Hawaii
+79°F
Las Vegas
+91°F
Los Angeles
+84°F
Miami
+86°F
Maui
+72°F
Myrtle Beach
+91°F
New York
+75°F
Panama City Beach
+95°F
San Diego
+72°F
San Francisco
+64°F
Santa Monica
+77°F
Sarasota
+88°F
Chicago
+72°F
all places
24 Hours Forecast
Nantucket
Local time: 16:54
September 14, monday
1800
68°F
S
21 mph
2100
66°F
S
16 mph
September 15, tuesday
0000
64°F
S
22 mph
0300
64°F
SW
19 mph
0600
63°F
SW
19 mph
0900
63°F
SW
16 mph
1200
63°F
SW
13 mph
1500
63°F
SW
14 mph
Units of measurement: °C / °F