Can you swim in Long Island in summer? In August 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 August was 74.5°F (in Islip), and the coldest water 70.3°F (in Montauk). To find out the sea temperature today and in the coming days, go to Current sea temperature in Long Island
Long Island cities and resorts with the values of the average water temperature in August 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