World sea water temperatures

Water temperature in Niantic (CT) in September

Is it warm enough to swim in Niantic in September? Average water temperature in Niantic in September is 68.7°F and therefore suitable for comfortable swimming. The warmest sea in Niantic 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 Niantic

Changes water temperature in Niantic in September 2025, 2024

To get an accurate forecast for the water temperature in Niantic for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Niantic, 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 169.6°F68.4°F64.9°F72.3°F
September 269.8°F69.1°F65.8°F72.3°F
September 369.4°F68.4°F65.7°F72.7°F
September 469.6°F68.2°F66.6°F73.2°F
September 5 68.4°F66.7°F73.6°F
September 6 67.8°F66.7°F74.5°F
September 7 67.1°F67.1°F73.4°F
September 8 67.8°F67.6°F73.6°F
September 9 68°F67.5°F73.2°F
September 10 67.8°F67.8°F73°F
September 11 68.2°F67.5°F72.9°F
September 12 68.2°F67.5°F71.6°F
September 13 68°F67.5°F72.5°F
September 14 68.4°F67.6°F71.6°F
September 15 67.8°F67.5°F71.2°F
Day 2025 2024 Min Max
September 16 68°F66.9°F71.2°F
September 17 66.2°F66°F71.2°F
September 18 66.2°F65.8°F71.1°F
September 19 67.8°F65.7°F71.1°F
September 20 68°F66°F71.1°F
September 21 67.8°F66°F70.9°F
September 22 66.9°F66.2°F71.2°F
September 23 66.6°F65.8°F70.7°F
September 24 63.1°F63.1°F70.9°F
September 25 64.4°F64.4°F71.1°F
September 26 64.8°F64.8°F70.9°F
September 27 64.8°F64.8°F70.2°F
September 28 64.9°F64.9°F70°F
September 29 64.8°F64.8°F69.8°F
September 30 66.4°F65.1°F69.4°F
Niantic water temp chart in September

Average water temperature in Niantic in September over a decade

20152016201720182019
70°F69.6°F68.2°F71.1°F68.4°F
20202021202220232024
68.7°F70.5°F70.3°F69.1°F67.1°F

Niantic sea state in September

Chart comparing the height of waves in Niantic 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 Niantic in September

Niantic 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
Rocky Neck68.9°F63.3°F74.8°F
Waterford68.7°F63.1°F74.5°F
Old Lyme69.3°F64.2°F75.6°F
Ocean Beach Park68.2°F63.5°F73.8°F
Noank68°F63.1°F73.4°F
Old Saybrook69.6°F65.7°F75.7°F
Saybrook Manor69.6°F65.7°F75.7°F
Plum Island68.9°F64.8°F74.8°F
Westbrook69.8°F65.5°F76.1°F
Orient Point69.3°F64.8°F75.6°F

Niantic photo gallery

  • Looking towards Fisher Island NY  Sunrise
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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 Niantic 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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