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Water temperature in Cape Henlopen (DE) in September

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Is it warm enough to swim in Cape Henlopen in September? Average water temperature in Cape Henlopen in September is 72.7°F and therefore suitable for comfortable swimming. The warmest sea in Cape Henlopen in September is 80.1°F, and the coldest is 66.4°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Cape Henlopen

Changes water temperature in Cape Henlopen in September 2025, 2024

To get an accurate forecast for the water temperature in Cape Henlopen for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Cape Henlopen, 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 173.4°F72.3°F70.7°F79.5°F
September 272.7°F71.4°F70.9°F76.8°F
September 372.9°F70°F70°F77.2°F
September 473.8°F70.9°F70.9°F77.9°F
September 5 70.5°F70.5°F78.3°F
September 6 69.4°F69.4°F79.7°F
September 7 70.5°F70.5°F80.1°F
September 8 70.5°F70.5°F79°F
September 9 70.2°F70.2°F77°F
September 10 70.2°F70.2°F76.8°F
September 11 70.9°F70.7°F76.8°F
September 12 70.9°F69.1°F76.3°F
September 13 71.2°F69.8°F76.1°F
September 14 71.4°F70.3°F75.9°F
September 15 71.1°F70.3°F74.7°F
Day 2025 2024 Min Max
September 16 71.8°F68.7°F75°F
September 17 71.4°F67.3°F74.8°F
September 18 71.6°F67.3°F75.6°F
September 19 71.6°F67.3°F75.6°F
September 20 72.5°F67.6°F75.4°F
September 21 71.6°F68°F75.6°F
September 22 72.1°F67.8°F75.4°F
September 23 71.4°F67.1°F74.3°F
September 24 71.4°F66.6°F73.4°F
September 25 70.9°F66.4°F74.3°F
September 26 70.9°F66.7°F73.9°F
September 27 70.7°F66.7°F74.5°F
September 28 72.9°F66.7°F73.6°F
September 29 72°F66.9°F73°F
September 30 71.6°F66.7°F72.7°F
Cape Henlopen water temp chart in September

Average water temperature in Cape Henlopen in September over a decade

20152016201720182019
73°F73.2°F72.1°F75.2°F73.4°F
20202021202220232024
73°F73.2°F73.6°F73.4°F71.2°F

Cape Henlopen sea state in September

Chart comparing the height of waves in Cape Henlopen 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 Cape Henlopen in September

Cape Henlopen 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
Broadkill Beach72.9°F66.4°F80.6°F
Towers Beach72.7°F66.6°F80.1°F
Rehoboth Bay72.9°F66.6°F80.6°F
Cape May Point72.7°F66.4°F79.9°F
Lower Township72.7°F66.2°F80.4°F
Wildwood72.5°F66.4°F79.9°F
Villas73°F66.2°F81.3°F
Dover73.8°F66.9°F82°F
Avalon72.5°F66.4°F79.9°F
Ocean City73.4°F67.3°F81°F

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  • rural Delaware Bay, middle section, Nantuxent Cove, picture taken at Money Island NJ
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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 Cape Henlopen 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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