Dartmouth (MA) water temp
This data the coastal Dartmouth 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 Dartmouth
Water temperature in Dartmouth today is 68.7°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Dartmouth was recorded in 2018 and was 71.4°F, and the coldest was recorded in 2013 at 64.9°F. Sea water temperature in Dartmouth is expected to drop to 66.4°F in the next 10 days. September average water temperature in Dartmouth is 68.2°F, the minimum temperature is 63.3°F, and the maximum is 75.6°F.
The swimming season in Dartmouth lasts from July to September. During those months, Dartmouth water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Dartmouth in winter reaches 40.8°F, in spring 46°F, in summer the average temperature rises to 68.2°F, and in autumn it is 61.3°F.
Dartmouth water temperature now
| September 17, 2025 |
|---|
| today temp |
| 68.7°F |
| September 16, 2025 |
|---|
| yesterday temp |
| 69.1°F |
The ocean salinity in Dartmouth is 29.64‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Dartmouth 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 Dartmouth. 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 Dartmouth. Data in table shown for September 17, 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 |
|---|---|---|---|
| 1' 1" | 1' 1" | 1' 1" | 1' 3" |
| 0.33 m | 0.33 m | 0.34 m | 0.37 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 1' 4" | 1' 4" | 1' 5" | 1' 3" |
| 0.4 m | 0.41 m | 0.42 m | 0.38 m |
Surf report in Dartmouth
Dartmouth weather forecast
Current temperature and weather
Data in a table show Dartmouth temperature today (September 17, 2025). For more information and forecast for a few days, go to the weather forecast Dartmouth.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | |  | |
| 57.9°F | 56.8°F | 56.3°F | 59.4°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
|  |  |  |
| 61.5°F | 64.2°F | 64.9°F | 64°F |
You may also be interested in other sections of our site for Dartmouth: Sunrise and Sunset, Tides
Dartmouth water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Dartmouth. 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 Dartmouth 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 | 39.7°F | 33.1°F | 46.9°F | cold |
| Ocean water temperature in Dartmouth in January | ||||
| February | 37°F | 31.3°F | 45.1°F | cold |
| Ocean water temperature in Dartmouth in February | ||||
| March | 39°F | 32°F | 48°F | cold |
| Ocean water temperature in Dartmouth in March | ||||
| April | 45.1°F | 36°F | 52°F | cold |
| Ocean water temperature in Dartmouth in April | ||||
| May | 53.8°F | 46.4°F | 64°F | cold |
| Ocean water temperature in Dartmouth in May | ||||
| June | 62.8°F | 55.8°F | 72.7°F | cold |
| Ocean water temperature in Dartmouth in June | ||||
| July | 70.3°F | 62.8°F | 77°F | warm |
| Ocean water temperature in Dartmouth in July | ||||
| August | 71.6°F | 65.8°F | 77.2°F | warm |
| Ocean water temperature in Dartmouth in August | ||||
| September | 68.2°F | 63.3°F | 75.6°F | warm |
| Ocean water temperature in Dartmouth in September | ||||
| October | 62.1°F | 55.2°F | 68.7°F | cold |
| Ocean water temperature in Dartmouth in October | ||||
| November | 53.6°F | 45.3°F | 61°F | cold |
| Ocean water temperature in Dartmouth in November | ||||
| December | 45.5°F | 39°F | 52.5°F | cold |
| Ocean water temperature in Dartmouth in December | ||||
Chart monthly average water temperature in Dartmouth
