Current Sea Water Temperature:
+65.6°F
| Maximum Sea Water Temperature in June: | 74.4°F |
| Minimum Sea Water Temperature in June: | 55.6°F |
| Average water temperature in June: | 63.0°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| June 24 | 65.6°F | June 19 | 66.4°F |
| June 23 | 65.8°F | June 18 | 63.8°F |
| June 22 | 66.0°F | June 17 | 66.8°F |
| June 21 | 65.6°F | June 16 | 67.0°F |
| June 20 | 66.8°F | June 15 | 62.6°F |
When is the Warmest Sea for Nantucket?
According to our data for the last three years for Nantucket the highest average sea water temperature was in August, July and September.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2025 for Nantucket was 71.9°F. The maximum and minimum values were 69.6°F and 75.8°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Nantucket was 70.7°F. The maximum and minimum values were 65.4°F and 75.4°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Nantucket was 69.7°F. The maximum and minimum values were 68.2°F and 71.6°F respectively.
USA Resorts:
NAME
F°
| Chicago |  |
+66 |
| Hawaii |  |
+80 |
| Honolulu | |
+80 |
| Houston |  |
+82 |
| Las Vegas | |
+96 |
| Los Angeles |  |
+66 |
| Maui |  |
+74 |
| Miami | |
+80 |
| Miami Beach | |
+88 |
| Myrtle Beach | |
+78 |
| New York | |
+70 |
| San Diego | |
+68 |
| San Francisco | |
+58 |
| Sarasota | |
+84 |
| Tampa | |
+84 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Nantucket
Local time: 00:23
25 jun, thursday
| 0300 |  |
66°F | E 12 mph |
| 0600 |  |
68°F | E 7 mph |
| 0900 | |
76°F | E 6 mph |
| 1200 | |
74°F | NE 11 mph |
| 1500 | |
70°F | NE 12 mph |
| 1800 | |
70°F | NE 13 mph |
| 2100 | |
70°F | N 15 mph |
26 jun, friday
| 0000 | |
68°F | N 16 mph |