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 68.5°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 2021 and was 75.7°F, and the coldest was recorded in 2023 at 64°F. Sea water temperature in Islip is expected to drop to 66.7°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

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 26, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Islip

Islip weather forecast

Current temperature and weather

Data in a table show Islip temperature today (September 26, 2025). For more information and forecast for a few days, go to the weather forecast Islip.

0-3 h	3-6 h	6-9 h	9-12 h
71.4°F	68.4°F	66°F	69.8°F

12-15 h	15-18 h	18-21 h	21-24 h
77°F	80.6°F	79.2°F	74.7°F

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

Chart monthly average water temperature in Islip

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

	Water	Weather		Wave
New York City	69.8°F	86°F		1' 3"
Great River	68.5°F	80.6°F		2' 10"
Bay Shore	68.4°F	80.6°F		2' 10"
Babylon	68.4°F	82.4°F		2' 8"
Great South Bay	68.4°F	80.6°F		2' 10"
West Sayville	68.4°F	82.4°F		3' 2"
Kismet	68.2°F	80.6°F		3' 7"
Democrat Point	68.2°F	82.4°F		3' 6"
Saltaire	68.2°F	80.6°F		3' 7"
Oak Beach	68.2°F	82.4°F		3' 6"

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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.