World sea water temperatures

Water temperature in Dennis (MA) in August

Is it warm enough to swim in Dennis in August? Average water temperature in Dennis in August is 70.2°F and therefore suitable for comfortable swimming. The warmest sea in Dennis in August is 78.1°F, and the coldest is 63.7°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Dennis

Changes water temperature in Dennis in August 2025, 2024

To get an accurate forecast for the water temperature in Dennis for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Dennis, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of August.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
August 168.9°F72.9°F65.8°F77.2°F
August 269.3°F72.9°F66.4°F75.9°F
August 370.5°F72.7°F66.6°F75.9°F
August 470°F73.2°F67.1°F76.5°F
August 570.5°F73.2°F67.5°F75.6°F
August 670.3°F72.1°F67.8°F77.4°F
August 770.9°F69.1°F67.3°F77.2°F
August 871.4°F70.5°F66.9°F77.4°F
August 970.9°F71.6°F66.6°F77°F
August 1070°F71.8°F66.4°F75.4°F
August 1172.5°F71.1°F66.4°F74.5°F
August 1272.7°F70.9°F67.5°F75°F
August 1371.2°F71.4°F66.9°F78.1°F
August 1472.7°F72°F67.1°F76.3°F
August 1573.9°F71.4°F66.9°F75.7°F
Day 2025 2024 Min Max
August 1671.6°F70.3°F66.2°F75.9°F
August 1773.4°F69.1°F65.5°F75.2°F
August 1873.2°F70.3°F64.4°F75.2°F
August 1971.1°F70.7°F64°F74.8°F
August 2070.7°F70.7°F64.9°F75.6°F
August 2168.9°F69.6°F65.5°F75.4°F
August 2267.1°F68.7°F65.5°F74.3°F
August 2366.2°F68.2°F65.3°F73°F
August 2467.5°F69.6°F65.5°F73°F
August 2569.4°F71.1°F65.3°F73.4°F
August 2668.9°F70.3°F63.7°F74.3°F
August 2768.7°F70.5°F65.5°F75°F
August 2867.8°F71.4°F65.3°F74.3°F
August 2968.9°F71.4°F65.1°F73°F
August 3070.2°F70.2°F65.5°F72.9°F
August 3169.3°F70.2°F65.5°F72.9°F
Dennis water temp chart in August

Average water temperature in Dennis in August over a decade

20162017201820192020
70.7°F68.4°F70.2°F71.6°F72.5°F
20212022202320242025
73.4°F72.7°F69.6°F70.9°F70.3°F

Dennis sea state in August

Chart comparing the height of waves in Dennis in August over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in Dennis in August

Dennis water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in August?

Want to know where the water temperature in August is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Temperature in neighboring cities

The nearest locations with the average water temperature in August. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Harborview Beach70.2°F63.7°F78.1°F
Chapin Beach70°F64°F77.4°F
Orleans69.1°F63.1°F76.5°F
Skaket Beach69.1°F63.1°F76.5°F
First Encounter Beach69.1°F63.1°F76.5°F
Crosby Landing Beach69.1°F63.1°F76.5°F
Linnell Landing Beach69.1°F63.1°F76.5°F
Ellis Landing beach69.1°F63.1°F76.5°F
Rock Harbor Beach69.1°F63.1°F76.5°F
Thumpertown Beach69.1°F63.1°F76.5°F

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for Dennis 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.

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