World sea water temperatures

Water temperature in New London (CT) in September

Is it warm enough to swim in New London in September? Average water temperature in New London in September is 68.4°F and therefore suitable for comfortable swimming. The warmest sea in New London in September is 73.8°F, and the coldest is 63.5°F. Average high air temperature in New London in September is 74°F, and average low temperature is 58°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in New London

Changes water temperature in New London in September 2025, 2024

To get an accurate forecast for the water temperature in New London for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in New London, 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 167.6°F68.4°F64.2°F72.1°F
September 268.4°F69.6°F65.1°F71.8°F
September 368.5°F67.6°F64.9°F72.3°F
September 469.4°F67.3°F65.8°F72.5°F
September 5 67.5°F66°F72.9°F
September 6 67.1°F66.2°F73.8°F
September 7 66.9°F66.6°F72.9°F
September 8 67.1°F67.1°F72.9°F
September 9 67.3°F66.9°F72.7°F
September 10 67.5°F67.1°F72.7°F
September 11 66.7°F66.7°F72.1°F
September 12 67.1°F67.1°F70.5°F
September 13 66.6°F66.6°F71.6°F
September 14 67.1°F67.1°F71.2°F
September 15 68°F66.9°F70.9°F
Day 2025 2024 Min Max
September 16 67.6°F66.4°F70.5°F
September 17 66.2°F65.5°F70.3°F
September 18 66°F65.3°F70.5°F
September 19 68.2°F65.3°F70.3°F
September 20 68°F65.5°F70.5°F
September 21 67.8°F65.5°F70.3°F
September 22 66.6°F65.5°F70.7°F
September 23 66.6°F65.3°F70.2°F
September 24 63.5°F63.5°F70.9°F
September 25 64.6°F64.6°F70.9°F
September 26 64.6°F64.6°F70.5°F
September 27 64.6°F64.6°F70°F
September 28 64.8°F64.4°F69.8°F
September 29 64.6°F64.6°F69.4°F
September 30 66°F64.8°F69.3°F
New London water temp chart in September

Average water temperature in New London in September over a decade

20152016201720182019
69.4°F69.1°F67.8°F70.5°F68°F
20202021202220232024
68.4°F70.2°F69.6°F68.5°F66.7°F

New London sea state in September

Chart comparing the height of waves in New London 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 New London in September

Weather and climate in New London in September

This data display average monthly climate indicators in New London in September based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

  • Average HIGH temperature74°F
  • Average LOW temperature58°F
  • Average rainfall days8 days
  • Average rainfall89mm/3.5''

New London 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
Niantic68.7°F63.1°F74.5°F
Noank68°F63.1°F73.4°F
Ocean Beach Park68.2°F63.5°F73.8°F
Waterford68.7°F63.1°F74.5°F
Rocky Neck68.9°F63.3°F74.8°F
Old Lyme69.3°F64.2°F75.6°F
Fishers Island68°F64°F73°F
Stonington67.6°F63.7°F72.5°F
Plum Island68.9°F64.8°F74.8°F
Old Saybrook69.6°F65.7°F75.7°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 New London 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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