Current sea water temperature:
+70.7°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 5 | 70.7°F | July 31 | 69.3°F |
| August 4 | 70.5°F | July 30 | 68.7°F |
| August 3 | 68.5°F | July 29 | 68.5°F |
| August 2 | 67.6°F | July 28 | 70.3°F |
| August 1 | 69.4°F | July 27 | 67.8°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:
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: 13:22
August 05, wednesday
1500
81°F
NE
11 mph
11 mph
1800
79°F
NE
12 mph
12 mph
2100
72°F
NE
12 mph
12 mph
August 06, thursday
0000
72°F
NE
13 mph
13 mph
0300
73°F
NE
13 mph
13 mph
0600
73°F
NE
12 mph
12 mph
0900
73°F
NE
13 mph
13 mph
1200
73°F
NE
15 mph
15 mph
