Dennis Port water temp

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.

Current sea temperature in Dennis Port

Water temperature in Dennis Port today is 66.4°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 2021 and was 69.3°F, and the coldest was recorded in 2020 at 62.1°F. Sea water temperature in Dennis Port is expected to drop to 62.2°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.

Dennis Port water temperature now

The sea salinity in Dennis Port is 31.90‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Dennis Port 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 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 25, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Dennis Port

Dennis Port weather forecast

Current temperature and weather

Data in a table show Dennis Port temperature today (September 25, 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
63.7°F	63.9°F	64.2°F	66°F

12-15 h	15-18 h	18-21 h	21-24 h
67.6°F	67.6°F	68.2°F	68.5°F

Dennis Port water temperature by month

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

Chart monthly average water temperature in Dennis Port

The nearest beaches and cities from Dennis Port with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Sea Street Beach	66.4°F	68°F		2' 2"
Bass River	67.5°F	68°F		2' 1"
Smugglers Beach	67.5°F	68°F		2' 1"
Bank Street Beach	65.1°F	68°F		2' 2"
Harwich Port	66.9°F	68°F		1' 9"
West Dennis	67.6°F	68°F		1' 7"
West Yarmouth	68.4°F	68°F		2' 1"
Sea Gull Beach	68.4°F	68°F		2' 1"
Seagull Beach	68.4°F	68°F		2' 1"
Lewis Bay	68.4°F	68°F		2' 1"

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Our report for Dennis Port is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.