Long Island Sound Sea Temperature

(Today) Sep 2020

20.8°C / 69.4°F

Current weather

9°C / 49°F
(clear sky)

Partly cloudy

6 mph



The measurements for the water temperature in Long Island Sound, New York are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.

Monthly average max / min water temperatures

The graph below shows the range of monthly Long Island Sound water temperature derived from many years of historical sea surface temperature data.

Long Island Sound average maximum / minimum water temperatures
Maximum and minimum monthly sea temperatures in Long Island Sound
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 2.8 2.2 2.4 3.5 6.9 13.1 18.4 20.3 18.2 13.3 10.4 6.2
Max °C 7.4 5 5.3 9.1 13.3 19.4 22.8 23.5 21.3 19.2 13.9 11
Min °F 38.9 37.1 37.4 40.5 47 58.1 66.9 69.8 66 58.3 52.1 45.1
Max °F 43.5 39.9 40.3 46.1 53.4 64.4 71.3 73 69.1 64.2 55.6 49.9

7 day tide forecast for Long Island Sound

  • High 2:26am
  • Low 8:31am
  • High 2:48pm
  • Low 9:10pm
  • High 3:22am
  • Low 9:27am
  • High 3:45pm
  • Low 10:11pm
  • High 4:24am
  • Low 10:28am
  • High 4:48pm
  • Low 11:16pm
  • High 5:30am
  • Low 11:35am
  • High 5:55pm
  • Low 12:23am
  • High 6:39am
  • Low 12:44pm
  • High 7:03pm
  • Low 1:29am
  • High 7:45am
  • Low 1:50pm
  • High 8:07pm
  • Low 2:28am
  • High 8:44am
  • Low 2:49pm
  • High 9:04pm
7 day tide times for Long Island Sound

*These tide times are estimates based on the nearest port (New Haven Harbor entrance, Connecticut) and may differ by up to half and hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.

Average September sea temperatures

  • Max: 21.3°C / 70.3°F
  • Avg: 19.7°C / 67.5°F
  • Min: 18.2°C / 64.7°F
Long Island Sound average water temp

These average ocean temperatures for Long Island Sound are calculated from several years of archived data.

Map showing location of Long Island Sound (41.096940, -72.879660)

Locations nearby


Whilst sea temperatures for Long Island Sound are as accurate as current data allows, there may be slight local and regional variations depending on conditions. Time of day and wind direction may have a temporary local effect as can water flows from neraby rivers.

Alternate names for Long Island Sound
Detroit de L'Isle Longue, Estuario de Long Island, Estuário de Long Island, Fjordo Long Island, Le Sund, Long Island Bogazi, Long Island Boğazı, Long Island Sound, Long Island-Sund, Long Islandi vaein, Long Islandi väin, Long-Ajlend, Lonq-Aylend bogazi, Lonq-Aylend boğazı, Maminketesuck, Praliu Long-Ajlend, lang aylnd swnd, long-aillaendeu haehyeob, ronguairando wan, zhang dao hai wan, Лонг-Айленд, Праліў Лонг-Айленд, لانگ آیلند سوند, ロングアイランド湾, 長島海灣, 롱아일랜드 해협