Barnstable water temp
This data the coastal Barnstable sea 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 sea temperature in Barnstable
Water temperature in Barnstable today is 70.3°F. Based on our historical data over a period of ten years, the warmest water in this day in the Cape Cod Bay near Barnstable was recorded in 2018 and was 74.3°F, and the coldest was recorded in 2017 at 64.8°F. Sea water temperature in Barnstable is expected to drop to 67.8°F in the next 10 days. September average water temperature in Barnstable is 67.1°F, the minimum temperature is 60.3°F, and the maximum is 75.2°F.
The swimming season in Barnstable lasts from July to September. During those months, Barnstable water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Barnstable in winter reaches 40.1°F, in spring 45.7°F, in summer the average temperature rises to 67.8°F, and in autumn it is 59.5°F.
Barnstable water temperature now
| September 5, 2025 |
|---|
| today temp |
| 70.3°F |
| September 4, 2025 |
|---|
| yesterday temp |
| 70°F |
The sea salinity in Barnstable is 31.86‰, and the average salinity of the World Ocean is 35‰.
Surf Forecast in Barnstable 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 Barnstable. 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 Barnstable. Data in table shown for September 5, 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' 4" | 1' 5" | 1' 7" | 1' 8" |
| 0.41 m | 0.44 m | 0.47 m | 0.51 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 1' 11" | 2' 3" | 2' 6" | 2' 6" |
| 0.58 m | 0.68 m | 0.75 m | 0.75 m |
Surf report in Barnstable
Barnstable weather forecast
Current temperature and weather
Data in a table show Barnstable temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Barnstable.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | | |
| 64.2°F | 64.8°F | 66.9°F | 68.9°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| |  | |
| 71.4°F | 72.7°F | 71.1°F | 69.6°F |
You may also be interested in other sections of our site for Barnstable: Sunrise and Sunset, Tides
Barnstable water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Barnstable. 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 Barnstable 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 | 39.2°F | 32.4°F | 46.6°F | cold |
| Sea water temperature in Barnstable in January | ||||
| February | 36.9°F | 30.6°F | 42.1°F | cold |
| Sea water temperature in Barnstable in February | ||||
| March | 38.8°F | 31.1°F | 46.6°F | cold |
| Sea water temperature in Barnstable in March | ||||
| April | 44.8°F | 36.3°F | 52°F | cold |
| Sea water temperature in Barnstable in April | ||||
| May | 53.2°F | 45.3°F | 63.7°F | cold |
| Sea water temperature in Barnstable in May | ||||
| June | 62.4°F | 53.1°F | 74.3°F | cold |
| Sea water temperature in Barnstable in June | ||||
| July | 70°F | 61.2°F | 77.9°F | warm |
| Sea water temperature in Barnstable in July | ||||
| August | 71.1°F | 64.2°F | 78.3°F | warm |
| Sea water temperature in Barnstable in August | ||||
| September | 67.1°F | 60.3°F | 75.2°F | cold |
| Sea water temperature in Barnstable in September | ||||
| October | 59.9°F | 52.9°F | 67.5°F | cold |
| Sea water temperature in Barnstable in October | ||||
| November | 51.4°F | 45°F | 60.8°F | cold |
| Sea water temperature in Barnstable in November | ||||
| December | 44.4°F | 37.6°F | 50.7°F | cold |
| Sea water temperature in Barnstable in December | ||||
Chart monthly average water temperature in Barnstable
