Nantucket water temp
This data the coastal Nantucket ocean water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.
Current ocean temperature in Nantucket
Water temperature in Nantucket today is 53.1°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Nantucket was recorded in 2022 and was 58.3°F, and the coldest was recorded in 2014 at 51.8°F. Sea water temperature in Nantucket is expected to drop to 51.3°F in the next 10 days. November average water temperature in Nantucket is 52.2°F, the minimum temperature is 45.9°F, and the maximum is 59.7°F.
The swimming season in Nantucket lasts from July to September. During those months, Nantucket water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Nantucket in winter reaches 41.7°F, in spring 45°F, in summer the average temperature rises to 64.6°F, and in autumn it is 59.2°F.
Nantucket water temperature now
| November 9, 2025 |
|---|
| today temp |
| 53.1°F |
| November 8, 2025 |
|---|
| yesterday temp |
| 53.4°F |
The ocean salinity in Nantucket is 31.97‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Nantucket for today
Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Nantucket. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Nantucket. Data in table shown for November 10, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 3' 7" | 3' 4" | 3' 0" | 2' 11" |
| 1.09 m | 1.01 m | 0.92 m | 0.89 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 2' 10" | 2' 10" | 3' 2" | 3' 10" |
| 0.87 m | 0.86 m | 0.97 m | 1.16 m |
Surf report in Nantucket
Nantucket weather forecast
Current temperature and weather
Data in a table show Nantucket temperature today (November 10, 2025). For more information and forecast for a few days, go to the weather forecast Nantucket.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | |  |
| 47.8°F | 46.9°F | 48.6°F | 46.8°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
|  | |  |
| 48.4°F | 51.1°F | 52.2°F | 53.2°F |
You may also be interested in other sections of our site for Nantucket: Sunrise and Sunset, Tides
Nantucket water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Nantucket. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Nantucket on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve
| Month | Avr | Min | Max | |
|---|---|---|---|---|
| January | 41°F | 34.3°F | 47.3°F | cold |
| Ocean water temperature in Nantucket in January | ||||
| February | 38.7°F | 31.1°F | 42.6°F | cold |
| Ocean water temperature in Nantucket in February | ||||
| March | 39.7°F | 33.4°F | 46.8°F | cold |
| Ocean water temperature in Nantucket in March | ||||
| April | 44.2°F | 37.6°F | 50.7°F | cold |
| Ocean water temperature in Nantucket in April | ||||
| May | 50.9°F | 45°F | 60.3°F | cold |
| Ocean water temperature in Nantucket in May | ||||
| June | 58.6°F | 52°F | 68.9°F | cold |
| Ocean water temperature in Nantucket in June | ||||
| July | 66.7°F | 60.1°F | 73.4°F | cold |
| Ocean water temperature in Nantucket in July | ||||
| August | 68.5°F | 63.1°F | 75°F | warm |
| Ocean water temperature in Nantucket in August | ||||
| September | 65.7°F | 59.4°F | 71.1°F | cold |
| Ocean water temperature in Nantucket in September | ||||
| October | 59.9°F | 53.2°F | 66.6°F | cold |
| Ocean water temperature in Nantucket in October | ||||
| November | 52.2°F | 45.9°F | 59.7°F | cold |
| Ocean water temperature in Nantucket in November | ||||
| December | 45.5°F | 39.4°F | 51.3°F | cold |
| Ocean water temperature in Nantucket in December | ||||
Chart monthly average water temperature in Nantucket
