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Water temperature in City Island (NY) in September

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Is it warm enough to swim in City Island in September? Average water temperature in City Island in September is 71.4°F and therefore suitable for comfortable swimming. The warmest sea in City Island in September is 77.9°F, and the coldest is 65.7°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in City Island

Changes water temperature in City Island in September 2025, 2024

To get an accurate forecast for the water temperature in City Island for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in City Island, 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 171.8°F74.3°F70.7°F75.9°F
September 271.2°F73.6°F70.3°F75.7°F
September 371.2°F73.2°F69.6°F76.3°F
September 471.8°F72.1°F69.4°F77.2°F
September 5 72.3°F69.8°F77.9°F
September 6 71.1°F70°F77.7°F
September 7 72.7°F70°F76.8°F
September 8 72°F69.8°F75.9°F
September 9 71.4°F69.4°F75.6°F
September 10 71.1°F69.3°F75.2°F
September 11 71.4°F68.7°F74.8°F
September 12 70.9°F68.9°F74.3°F
September 13 72°F68.4°F74.3°F
September 14 72°F68.7°F73.6°F
September 15 72.7°F68.5°F74.1°F
Day 2025 2024 Min Max
September 16 72.5°F68.4°F73.8°F
September 17 72.1°F67.5°F73.4°F
September 18 71.8°F67.5°F75.2°F
September 19 71.6°F66.7°F73.6°F
September 20 70.9°F67.1°F73°F
September 21 71.1°F67.1°F73.2°F
September 22 70.3°F67.6°F73°F
September 23 70°F68°F72.5°F
September 24 69.6°F68°F71.8°F
September 25 69.3°F67.5°F72.3°F
September 26 68.9°F67.5°F72.5°F
September 27 68.5°F67.3°F72°F
September 28 68.2°F67.3°F71.8°F
September 29 67.8°F66.7°F71.2°F
September 30 67.6°F65.7°F70.7°F
City Island water temp chart in September

Average water temperature in City Island in September over a decade

20152016201720182019
72.5°F72.1°F70.2°F73.4°F71.4°F
20202021202220232024
71.6°F72.7°F72.5°F72°F71.1°F

City Island sea state in September

Chart comparing the height of waves in City Island 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 City Island in September

City Island 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
New York City71.1°F64.8°F78.1°F
Orchard Beach71.4°F65.7°F77.9°F
Little Neck Bay71.4°F65.7°F77.9°F
Great Neck Estates71.4°F65.7°F77.9°F
Manhasset Bay71.4°F65.7°F77.9°F
Glenwood Landing71.6°F65.5°F78.1°F
Rye Beach71.6°F65.5°F78.1°F
Hempstead Harbor71.6°F65.7°F78.1°F
Rye71.6°F65.7°F78.1°F
Mamaroneck71.6°F65.3°F78.1°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 City Island 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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