World sea water temperatures

Water temperature in Dennis (MA) in September

Is it warm enough to swim in Dennis in September? Average water temperature in Dennis in September is 66.4°F and therefore is not suitable for comfortable swimming. The warmest sea in Dennis in September is 73.6°F, and the coldest is 60.1°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 September 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 September.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
September 168.5°F70.9°F65.1°F72.9°F
September 268.4°F70.3°F64.6°F72.7°F
September 368.5°F68.7°F63.7°F72.5°F
September 469.8°F68.9°F63.5°F73°F
September 5 69.3°F63.7°F72.7°F
September 6 68°F63.9°F72.9°F
September 7 68.5°F64.4°F73.6°F
September 8 68.4°F64.4°F72.9°F
September 9 67.5°F64.4°F72.7°F
September 10 68.5°F64.4°F72.3°F
September 11 67.6°F63.9°F71.8°F
September 12 69.1°F63.9°F71.6°F
September 13 69.6°F63.9°F71.2°F
September 14 69.6°F64°F72.7°F
September 15 69.3°F64°F70.5°F
Day 2025 2024 Min Max
September 16 68.7°F64.8°F69.8°F
September 17 67.8°F63.7°F69.3°F
September 18 67.5°F63.3°F71.4°F
September 19 66.9°F62.2°F70.7°F
September 20 64.8°F62.8°F69.4°F
September 21 64°F60.6°F69.3°F
September 22 63.1°F60.1°F69.6°F
September 23 63.7°F60.3°F69.4°F
September 24 63.3°F61.5°F70°F
September 25 63°F61.9°F69.3°F
September 26 62.6°F61.5°F69.4°F
September 27 63.1°F61.2°F69.1°F
September 28 64.2°F61.2°F68.9°F
September 29 63°F61.3°F68°F
September 30 63.3°F61.2°F66.7°F
Dennis water temp chart in September

Average water temperature in Dennis in September over a decade

20152016201720182019
67.5°F66.6°F63.5°F68.5°F66.7°F
20202021202220232024
66.9°F70°F68.5°F67.8°F66.7°F

Dennis sea state in September

Chart comparing the height of waves in Dennis in September 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 September

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 September?

Want to know where the water temperature in September 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 September. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Harborview Beach66.4°F60.1°F73.6°F
Chapin Beach66.6°F59.9°F73.8°F
Orleans65.5°F60.1°F72.7°F
Skaket Beach65.5°F60.1°F72.7°F
First Encounter Beach65.5°F60.1°F72.7°F
Crosby Landing Beach65.5°F60.1°F72.7°F
Linnell Landing Beach65.5°F60.1°F72.7°F
Ellis Landing beach65.5°F60.1°F72.7°F
Rock Harbor Beach65.5°F60.1°F72.7°F
Thumpertown Beach65.5°F60.1°F72.7°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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