World sea water temperatures

Islip water temp

This data the coastal Islip sea water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current sea temperature in Islip

Water temperature in Islip today is 72°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Islip was recorded in 2018 and was 77.4°F, and the coldest was recorded in 2017 at 68.7°F. Sea water temperature in Islip is expected to drop to 71.4°F in the next 10 days. September average water temperature in Islip is 70.9°F, the minimum temperature is 62.2°F, and the maximum is 80.1°F.

The swimming season in Islip lasts from June to September. During those months, Islip water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Islip in winter reaches 42.8°F, in spring 47.5°F, in summer the average temperature rises to 71.2°F, and in autumn it is 63.3°F.

Islip water temperature now


September 5, 2025
today temp
72°F
September 4, 2025
yesterday temp
70.9°F


The sea salinity in Islip is 29.78‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Islip for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Islip. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Islip. Data in table shown for September 5, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

0-3 h3-6 h6-9 h9-12 h
3' 1"2' 11"3' 1"3' 0"
0.94 m0.89 m0.93 m0.91 m
12-15 h15-18 h18-21 h21-24 h
2' 10"2' 11"3' 8"4' 0"
0.87 m0.9 m1.12 m1.21 m

Surf report in Islip

Islip wave height and direction

Islip weather forecast

Islip wind speed and direction

Current temperature and weather

Data in a table show Islip temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Islip.

0-3 h3-6 h6-9 h9-12 h
69.3°F69.3°F69.4°F71.8°F
12-15 h15-18 h18-21 h21-24 h
80.2°F79.9°F76.5°F73.9°F

You may also be interested in other sections of our site for Islip: Sunrise and Sunset, Tides

Islip water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Islip. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Islip on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

MonthAvrMinMax
January41.7°F30°F49.8°Fcold
Sea water temperature in Islip in January
February38.8°F32.7°F44.4°Fcold
Sea water temperature in Islip in February
March40.8°F32.4°F50.2°Fcold
Sea water temperature in Islip in March
April46.6°F37.6°F55.9°Fcold
Sea water temperature in Islip in April
May54.9°F46.4°F66.4°Fcold
Sea water temperature in Islip in May
June65.1°F54.5°F77.9°Fcold
Sea water temperature in Islip in June
July74.1°F65.8°F83.7°Fwarm
Sea water temperature in Islip in July
August74.5°F67.6°F82.9°Fwarm
Sea water temperature in Islip in August
September70.9°F62.2°F80.1°Fwarm
Sea water temperature in Islip in September
October63.7°F56.1°F77.4°Fcold
Sea water temperature in Islip in October
November55.2°F41.7°F62.8°Fcold
Sea water temperature in Islip in November
December47.7°F40.1°F53.8°Fcold
Sea water temperature in Islip in December

Chart monthly average water temperature in Islip

Water temperature in Islip

Where is the warmest sea water in the world?

If you want to plan a vacation on the beach and enjoy the warm sea, choose the day of the year, region and the minimum comfortable sea/ocean temperature that interests you. As a result, you will get a list of countries and cities in which the average sea temperature or maximum temperature on this day over the past 10 years exceeds your chosen value

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Nearby beaches and cities

The nearest beaches and cities from Islip with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

WaterWeatherWave
New York City71.4°F82.4°F1' 6"
Great River71.6°F80.6°F3' 2"
Bay Shore71.6°F80.6°F3' 2"
Babylon71.8°F78.8°F 
Great South Bay71.4°F80.6°F3' 2"
West Sayville71.4°F78.8°F3' 6"
Kismet71.4°F80.6°F4' 1"
Democrat Point71.4°F78.8°F4' 0"
Saltaire71.4°F80.6°F4' 1"
Oak Beach71.4°F78.8°F4' 0"

Long Island photo gallery

  • Long Island
  • Long Island
  • Long Island
  • Port Jefferson Ferry - Port Jefferson harbor

If you have interesting photos of this place, you can upload them here. Photos will be available to all users after verification by the moderator.

Vote for Long Island best beach

Current rating: (0 votes cast)

If you know this place (Islip) and want to leave your comment or rate it, then fill out the following form.

Your rating for this place:

Does this place have a "Blue Flag" award [1], are there rip currents and what type of beach is it, sand or pebble:

Is the beach a dog-friendly place, child friendly or a nudist beach?


Your comments for this place (water quality, crowds, facilities, activities, lifeguards, service etc.):



[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.

Get widget or API for your website

Our report for Islip 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.

Contact us: admin@seatemperature.info
privacy policy