Long Island water temperature in September

Is Long Island too cold to swim in fall? In September sea water temperature throughout Long Island warms above 68°F and it is enough for a comfortable bath. Based on average water temperature observations over the past ten years, the warmest sea in Long Island in September was 71.6°F (in East Setauket), and the coldest water 68°F (in Ditch Plains Beach). To find out the sea temperature today and in the coming days, go to Current sea temperature in Long Island

Long Island sea surface temp in September

Long Island cities and resorts with the values of the average water temperature in September in recent years.
For more detailed information about water temperature, surf forecast, weather and time of sunrise and sunset in any specific area of your interest, just click on a city name. For ease of search, all places are also grouped by the first letter of the name.

To find out what the water temperature was in Long Island any day over a period of the last ten years, select the month

Places with the warmest average sea water temperature in Long Island in September. Also indicated are the maximum and minimum temperatures in September for these locations based on observations over the past 10 years

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Our report for United States 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.