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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 671.6°F68°F
September 771.6°F66.2°F
September 871.6°F68°F
September 969.8°F68°F
September 1069.8°F68°F
September 1169.8°F68°F
September 1269.8°F69.8°F
September 1369.8°F69.8°F
September 1471.6°F71.6°F
September 1569.8°F71.6°F
Day 2025 2024
September 1671.6°F71.6°F
September 1771.6°F69.8°F
September 1869.8°F71.6°F
September 1969.8°F71.6°F
September 2069.8°F71.6°F
September 2171.6°F69.8°F
September 2271.6°F69.8°F
September 2373.4°F69.8°F
September 2473.4°F69.8°F
September 2571.6°F69.8°F
September 2673.4°F69.8°F
September 2773.4°F71.6°F
September 2873.4°F71.6°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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