Current sea water temperature:
+40.8°F
| Minimum sea water temperature in December: | 50.7°F |
| Maximum sea water temperature in December: | 38.8°F |
| Average sea water temperature in December: | 44.9°F |
| more information | |
14 days
forecast
forecast
| Nantucket |
monthly
weather
weather
| Nantucket |
Sea water temperature for the last 10 days:
| December 24 | 40.8°F | December 19 | 41.2°F |
| December 23 | 41.0°F | December 18 | 40.8°F |
| December 22 | 42.3°F | December 17 | 42.1°F |
| December 21 | 41.4°F | December 16 | 41.7°F |
| December 20 | 40.3°F | December 15 | 43.2°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
December
December
| Nantucket |
Best time for vacation in Nantucket
Nantucket on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Nantucket
Local time: 05:05
December 24, wednesday
0600
37°F
E
21 mph
21 mph
0900
39°F
E
31 mph
31 mph
1200
39°F
SE
34 mph
34 mph
1500
37°F
SE
38 mph
38 mph
1800
37°F
SW
26 mph
26 mph
2100
36°F
S
16 mph
16 mph
December 25, thursday
0000
36°F
S
11 mph
11 mph
0300
34°F
SE
6 mph
6 mph
