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Water temperature in Washington DC (DC) in September

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Is it warm enough to swim in Washington DC in September? Average water temperature in Washington DC in September is 71.4°F and therefore suitable for comfortable swimming. The warmest water in Washington DC in September is 80.6°F, and the coldest is 60.8°F. To find out the water temperature today and in the coming days, go to Current water temperature in Washington DC

Changes water temperature in Washington DC in September 2025, 2024

To get an accurate forecast for the water temperature in Washington DC for any chosen month, compare two years within a 10 year range using the chart below.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024
September 169.8°F77°F
September 269.8°F75.2°F
September 371.6°F71.6°F
September 471.6°F71.6°F
September 571.6°F69.8°F
September 6 68°F
September 7 66.2°F
September 8 68°F
September 9 68°F
September 10 68°F
September 11 68°F
September 12 69.8°F
September 13 69.8°F
September 14 71.6°F
September 15 71.6°F
Day 2025 2024
September 16 71.6°F
September 17 69.8°F
September 18 71.6°F
September 19 71.6°F
September 20 71.6°F
September 21 69.8°F
September 22 69.8°F
September 23 69.8°F
September 24 69.8°F
September 25 69.8°F
September 26 69.8°F
September 27 71.6°F
September 28 71.6°F
September 29 71.6°F
September 30 69.8°F

Washington DC 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

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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 Washington DC 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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