World sea water temperatures

Water temperature in East Lyme (CT) in September

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Is it warm enough to swim in East Lyme in September? Average water temperature in East Lyme in September is 68.7°F and therefore suitable for comfortable swimming. The warmest sea in East Lyme in September is 74.5°F, and the coldest is 63.1°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in East Lyme

Changes water temperature in East Lyme in September 2025, 2024

To get an accurate forecast for the water temperature in East Lyme for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in East Lyme, 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 169.8°F68.5°F65.1°F72.1°F
September 269.6°F67.8°F65.8°F71.4°F
September 369.3°F68.2°F65.7°F72.5°F
September 469.6°F68.2°F66.6°F70.9°F
September 569.8°F68.4°F67.6°F71.8°F
September 669.6°F68°F66.7°F74.5°F
September 769.8°F67.3°F66.9°F73.2°F
September 868.7°F67.8°F67.6°F73°F
September 968.5°F68°F67.3°F73.2°F
September 1068.5°F67.8°F67.8°F73°F
September 1169.1°F68.7°F67.6°F72.7°F
September 1268.7°F68.5°F67.3°F72.1°F
September 1368.7°F68.5°F67.5°F72.7°F
September 1469.1°F68.5°F67.5°F71.6°F
September 1568.9°F67.3°F67.3°F71.2°F
Day 2025 2024 Min Max
September 1668.4°F67.8°F67.5°F70.3°F
September 1768.9°F66°F65.8°F71.1°F
September 1868.9°F66°F65.7°F71.1°F
September 1969.1°F68°F65.5°F70.9°F
September 2069.4°F68.2°F65.7°F71.1°F
September 2168.9°F68°F66.4°F70.9°F
September 2268.9°F66.6°F66.2°F68.9°F
September 2369.1°F66.6°F65.5°F70.7°F
September 2469.1°F63.1°F63.1°F71.1°F
September 2568.5°F64.9°F64.9°F71.1°F
September 2668.9°F65.1°F65.1°F70.9°F
September 2769.3°F64.9°F64.9°F70.2°F
September 2870.3°F65.1°F64.9°F70.3°F
September 2969.8°F64.9°F64.9°F69.8°F
September 3069.8°F66.4°F64.9°F69.8°F
East Lyme water temp chart in September

Average water temperature in East Lyme in September over a decade

20162017201820192020
69.4°F68°F70.9°F68.4°F68.7°F
20212022202320242025
70.5°F70.5°F69.1°F67.1°F69.1°F

East Lyme 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 East Lyme 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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