This data the coastal Dennis Port 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.
Water temperature in Dennis Port today is 70.2°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Dennis Port was recorded in 2018 and was 73.2°F, and the coldest was recorded in 2007 at 65.3°F. Sea water temperature in Dennis Port is expected to drop to 67.6°F in the next 10 days. September average water temperature in Dennis Port is 66.9°F, the minimum temperature is 61°F, and the maximum is 74.3°F.
The swimming season in Dennis Port lasts from July to September. During those months, Dennis Port water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Dennis Port in winter reaches 41°F, in spring 45.3°F, in summer the average temperature rises to 67.1°F, and in autumn it is 59.4°F.
September 5, 2025 |
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today temp |
70.2°F |
September 4, 2025 |
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yesterday temp |
68.7°F |
The sea salinity in Dennis Port is 31.90‰, and the average salinity of the World Ocean is 35‰.
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 Dennis Port. 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 Dennis Port. 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' 9" | 1' 10" | 1' 11" | 2' 1" |
0.53 m | 0.55 m | 0.59 m | 0.63 m |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
2' 4" | 2' 7" | 3' 0" | 3' 2" |
0.7 m | 0.8 m | 0.91 m | 0.96 m |
Data in a table show Dennis Port temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Dennis Port.
0-3 h | 3-6 h | 6-9 h | 9-12 h |
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![]() | ![]() | ![]() | ![]() |
63.9°F | 64.8°F | 65.7°F | 67.5°F |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
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70.7°F | 71.4°F | 70°F | 69.1°F |
You may also be interested in other sections of our site for Dennis Port: Sunrise and Sunset, Tides
These figures shows the average, minimum and maximum monthly sea temperature in Dennis Port. 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 Dennis Port 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 | |
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January | 40.1°F | 34°F | 47.1°F | cold |
Sea water temperature in Dennis Port in January | ||||
February | 37.9°F | 30.9°F | 42.3°F | cold |
Sea water temperature in Dennis Port in February | ||||
March | 39.4°F | 32.5°F | 46.6°F | cold |
Sea water temperature in Dennis Port in March | ||||
April | 44.4°F | 36.9°F | 50.7°F | cold |
Sea water temperature in Dennis Port in April | ||||
May | 52°F | 45°F | 61.9°F | cold |
Sea water temperature in Dennis Port in May | ||||
June | 60.8°F | 53.4°F | 72.7°F | cold |
Sea water temperature in Dennis Port in June | ||||
July | 69.4°F | 60.8°F | 77.2°F | warm |
Sea water temperature in Dennis Port in July | ||||
August | 70.9°F | 63.9°F | 77.2°F | warm |
Sea water temperature in Dennis Port in August | ||||
September | 66.9°F | 61°F | 74.3°F | cold |
Sea water temperature in Dennis Port in September | ||||
October | 59.7°F | 52.7°F | 68°F | cold |
Sea water temperature in Dennis Port in October | ||||
November | 51.4°F | 44.1°F | 60.1°F | cold |
Sea water temperature in Dennis Port in November | ||||
December | 44.8°F | 37.2°F | 50.9°F | cold |
Sea water temperature in Dennis Port in December |