World sea water temperatures

Water temperature in West Dennis in September

Is it warm enough to swim in West Dennis in September? Average water temperature in West Dennis in September is 67.5°F and therefore is not suitable for comfortable swimming. The warmest sea in West Dennis in September is 75.6°F, and the coldest is 61.2°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in West Dennis

Changes water temperature in West Dennis in September 2025, 2024

To get an accurate forecast for the water temperature in West 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 West 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 170.2°F72.1°F65.8°F75.6°F
September 269.6°F71.6°F66°F74.8°F
September 370.2°F71.2°F65.8°F74.5°F
September 472°F71.4°F66°F74.7°F
September 5 71.4°F65.5°F73.6°F
September 6 69.3°F64.8°F73.8°F
September 7 68.5°F64.8°F74.8°F
September 8 70.5°F64.9°F73.4°F
September 9 69.6°F65.7°F73.6°F
September 10 69.4°F65.5°F73.2°F
September 11 69.4°F65.5°F72.3°F
September 12 70°F65.1°F74.3°F
September 13 70.9°F64.2°F72.5°F
September 14 70.9°F64.4°F74.3°F
September 15 70.9°F63.9°F72.3°F
Day 2025 2024 Min Max
September 16 70.7°F64.8°F70.9°F
September 17 69.4°F63.7°F70.9°F
September 18 68.9°F63.5°F72.1°F
September 19 68.4°F62.4°F72.5°F
September 20 66.7°F63.3°F71.1°F
September 21 65.1°F62.1°F70.5°F
September 22 63.9°F61.2°F71.1°F
September 23 63.7°F61.2°F70.9°F
September 24 64°F62.2°F71.2°F
September 25 63.7°F62.4°F70.3°F
September 26 63.3°F61.9°F71.1°F
September 27 63.5°F61.3°F70.9°F
September 28 65.3°F61.3°F70.3°F
September 29 64°F61.5°F69.3°F
September 30 64.6°F61.5°F68.5°F
West Dennis water temp chart in September

Average water temperature in West Dennis in September over a decade

20152016201720182019
69.3°F68.4°F65.3°F69.6°F68.4°F
20202021202220232024
68°F71.4°F70.2°F69.4°F68°F

West Dennis sea state in September

Chart comparing the height of waves in West 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 West Dennis in September

West 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
Bass River67.6°F61.2°F75.6°F
Smugglers Beach67.6°F61.2°F75.6°F
West Yarmouth68°F61.5°F76.6°F
Sea Gull Beach68°F61.5°F76.6°F
Seagull Beach68°F61.5°F76.6°F
Lewis Bay68°F61.5°F76.6°F
Sea Street Beach66.9°F61°F74.3°F
Colonial Acres Beach68°F61.5°F76.6°F
Hyannis68.4°F61.7°F77°F
Kalmus Beach68.4°F61.7°F77°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 West 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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