World sea water temperatures

Water temperature in Islip in May

Is it warm enough to swim in Islip in May? Average water temperature in Islip in May is 54.9°F and therefore is not suitable for comfortable swimming. The warmest sea in Islip in May is 66.4°F, and the coldest is 46.4°F. Average high air temperature in Islip in May is 68°F, and average low temperature is 50°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Islip

Changes water temperature in Islip in May 2025, 2024

To get an accurate forecast for the water temperature in Islip for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Islip, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of May.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
May 152.2°F50.9°F46.4°F55°F
May 250.4°F52.2°F47.3°F54.5°F
May 350°F54.9°F47.7°F55.4°F
May 450°F55.8°F47.8°F56.1°F
May 550.2°F55°F48°F56.3°F
May 652.2°F54.1°F48.9°F56.8°F
May 753.8°F53.6°F48.2°F58.1°F
May 853.8°F54.3°F48.9°F60.1°F
May 954°F54.5°F49.5°F61.7°F
May 1055.9°F54°F49.8°F61.2°F
May 1156.7°F54.5°F50.5°F61°F
May 1257.6°F54.3°F50.4°F62.8°F
May 1356.5°F55.9°F50°F63.5°F
May 1456.1°F55.2°F50.4°F64.4°F
May 1554.7°F55°F51.4°F64°F
Day 2025 2024 Min Max
May 1655°F54.5°F51.3°F63.3°F
May 1757.7°F54.7°F51.3°F63.3°F
May 1859°F54.7°F51.4°F62.1°F
May 1959.2°F54°F49.3°F62.2°F
May 2060.3°F55.4°F51.8°F63.1°F
May 2159°F55°F52.2°F63.1°F
May 2258.6°F55°F52.5°F63.1°F
May 2358.3°F56.5°F53.4°F63.3°F
May 2457°F57.2°F54°F64.6°F
May 2557.2°F57°F54.3°F64.4°F
May 2658.6°F56.8°F54.3°F65.3°F
May 2759°F57.9°F54.9°F64.9°F
May 2858.6°F58.3°F54.7°F66.4°F
May 2958.5°F59.4°F55.2°F66.4°F
May 3057.6°F57.4°F56.1°F66°F
May 3158.5°F58.1°F55.2°F66.2°F
Islip water temp chart in May

Average water temperature in Islip in May over a decade

20162017201820192020
53.4°F53.2°F53.1°F57.7°F53.8°F
20212022202320242025
58.8°F53.8°F61.3°F55.4°F55.9°F

Islip sea state in May

Chart comparing the height of waves in Islip in May over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in Islip in May

Weather and climate in Islip in May

This data display average monthly climate indicators in Islip in May based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

  • Average HIGH temperature68°F
  • Average LOW temperature50°F
  • Average rainfall days11 days
  • Average rainfall97mm/3.8''

Islip water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in May?

Want to know where the water temperature in May is good for swimming? Select the continent of interest, the day of the month and the required water temperature

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

Temperature in neighboring cities

The nearest locations with the average water temperature in May. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
New York City56.7°F48.7°F66.9°F
Great River54.9°F46.2°F67.5°F
Bay Shore54.3°F46.2°F65.8°F
Babylon54.5°F46.4°F65.8°F
Great South Bay54.3°F46°F65.7°F
West Sayville54.5°F46°F66.9°F
Kismet53.8°F46°F65.8°F
Democrat Point54.1°F46.4°F65.8°F
Saltaire53.8°F46°F65.8°F
Oak Beach54.1°F46.4°F65.8°F

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[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.

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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.

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