Current sea water temperature:
+36.5°F
| Minimum sea water temperature in January: | 45.3°F |
| Maximum sea water temperature in January: | 33.8°F |
| Average sea water temperature in January: | 40.3°F |
| more information | |
14 days
forecast
forecast
| Nantucket |
monthly
weather
weather
| Nantucket |
Sea water temperature for the last 10 days:
| January 10 | 36.5°F | January 5 | 37.2°F |
| January 9 | 35.6°F | January 4 | 37.4°F |
| January 8 | 35.4°F | January 3 | 38.1°F |
| January 7 | 38.1°F | January 2 | 37.2°F |
| January 6 | 37.9°F | January 1 | 38.8°F |
Monthly sea water temperature, °F
When is the warmest sea in Nantucket?
Based on the data about daily sea water temperature for the last three years the warmest sea in Nantucket was noticed in August, July and September.
Monthly Sea Temperatures in Nantucket, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 69.7°F. The highest and lowest sea temperatures during the month were 73.2°F and 67.6°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 68.7°F. The highest and lowest sea temperatures during the month were 72.9°F and 63.9°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.
current
weather
weather
| Nantucket |
weather in
January
January
| Nantucket |
Best time for vacation in Nantucket
Nantucket on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Nantucket
Local time: 21:18
January 11, sunday
0000
43°F
NW
34 mph
34 mph
0300
48°F
NE
26 mph
26 mph
0600
45°F
E
18 mph
18 mph
0900
41°F
E
12 mph
12 mph
1200
37°F
E
7 mph
7 mph
1500
37°F
SE
12 mph
12 mph
1800
37°F
E
11 mph
11 mph
2100
37°F
E
17 mph
17 mph
