World sea water temperatures

Water temperature in Islip in April

Is it warm enough to swim in Islip in April? Average water temperature in Islip in April is 46.6°F and therefore is not suitable for comfortable swimming. The warmest sea in Islip in April is 55.9°F, and the coldest is 37.6°F. Average high air temperature in Islip in April is 58°F, and average low temperature is 41°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 April 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 April.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
April 148°F47.7°F37.6°F48°F
April 247.7°F46.9°F38.1°F47.7°F
April 346.8°F46.4°F38.1°F47.8°F
April 445.5°F46.2°F38.7°F48.2°F
April 544.6°F45.5°F38.8°F48°F
April 645.5°F45.5°F39.7°F48°F
April 745.3°F45°F39.7°F47.8°F
April 847.8°F45.5°F39.7°F48.2°F
April 946.9°F45.3°F39.6°F49.1°F
April 1046.6°F44.1°F39.6°F50°F
April 1146°F45°F40.1°F49.1°F
April 1245.7°F46.2°F40.8°F48.9°F
April 1345.1°F48.4°F41.4°F50.7°F
April 1445.9°F49.5°F41.2°F50.9°F
April 1545.5°F50.9°F41.2°F53.8°F
Day 2025 2024 Min Max
April 1646.8°F51.4°F41.4°F52.7°F
April 1747.7°F53.2°F41.4°F53.2°F
April 1848.4°F51.4°F41.5°F53.8°F
April 1945.9°F50.5°F41.9°F54.3°F
April 2047.5°F50.7°F42.3°F54.3°F
April 2148.6°F51.3°F43°F54.3°F
April 2248.4°F50.5°F43.7°F53.1°F
April 2348.2°F50.7°F44.1°F51.6°F
April 2448.9°F52°F44.1°F52°F
April 2550.5°F53.2°F44.2°F53.2°F
April 2650.4°F53.8°F44.8°F55°F
April 2750.5°F52.3°F45.3°F54.1°F
April 2849.6°F51.8°F45.9°F54.1°F
April 2949.3°F51.4°F46.4°F55.4°F
April 3050.7°F51.1°F46.4°F55.9°F
Islip water temp chart in April

Average water temperature in Islip in April over a decade

20162017201820192020
46.9°F45.9°F44.2°F47.7°F48.2°F
20212022202320242025
50.2°F48.4°F49.8°F49.1°F47.5°F

Islip sea state in April

Chart comparing the height of waves in Islip in April 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 April

Weather and climate in Islip in April

This data display average monthly climate indicators in Islip in April 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 temperature58°F
  • Average LOW temperature41°F
  • Average rainfall days11 days
  • Average rainfall109mm/4.3''
  • Average snowfall15mm/0.6''

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 April?

Want to know where the water temperature in April 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 April. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
New York City47.5°F40.3°F54°F
Great River46.4°F37.6°F56.5°F
Bay Shore46.2°F37.8°F54°F
Babylon46.2°F37.8°F53.4°F
Great South Bay46°F37.6°F54.5°F
West Sayville46.2°F37.6°F55.9°F
Kismet45.7°F37.8°F53.1°F
Democrat Point45.9°F37.9°F53.2°F
Saltaire45.7°F37.8°F53.1°F
Oak Beach45.9°F37.9°F53.2°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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