Current sea water temperature:
+71.6°F
| Minimum sea water temperature in August: | 78.8°F |
| Maximum sea water temperature in August: | 67.6°F |
| Average sea water temperature in August: | 72.0°F |
| more information | |
14 days
forecast
forecast
| Nantucket |
monthly
weather
weather
| Nantucket |
Sea water temperature for the last 10 days:
| August 25 | 71.6°F | August 20 | 72.3°F |
| August 24 | 72.0°F | August 19 | 72.9°F |
| August 23 | 69.8°F | August 18 | 72.0°F |
| August 22 | 70.2°F | August 17 | 71.2°F |
| August 21 | 70.3°F | August 16 | 72.1°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:
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 July, °F
Show year:
2026
2025
2024
The average sea water temperature in July of 2026 was 69.5°F. The highest and lowest sea temperatures during the month were 71.8°F and 66.7°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
August
August
| Nantucket |
Best time for vacation in Nantucket
Nantucket on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Nantucket
Local time: 15:33
August 25, tuesday
1800
72°F
E
22 mph
22 mph
2100
72°F
E
19 mph
19 mph
August 26, wednesday
0000
73°F
E
14 mph
14 mph
0300
70°F
E
14 mph
14 mph
0600
70°F
E
12 mph
12 mph
0900
70°F
SE
7 mph
7 mph
1200
70°F
E
9 mph
9 mph
1500
70°F
E
9 mph
9 mph
