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Water temperature in Mastic Beach (NY) in May

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Is it warm enough to swim in Mastic Beach in May? Average water temperature in Mastic Beach in May is 53.1°F and therefore is not suitable for comfortable swimming. The warmest sea in Mastic Beach in May is 65.1°F, and the coldest is 45.9°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Mastic Beach

Changes water temperature in Mastic Beach in May 2025, 2024

To get an accurate forecast for the water temperature in Mastic Beach for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Mastic Beach, 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 151.1°F49.6°F45.9°F52.2°F
May 250.5°F50.9°F46.4°F50.9°F
May 349.1°F51.6°F46.8°F51.6°F
May 448.6°F50.2°F47.3°F52.5°F
May 549.1°F50.4°F47.1°F52.3°F
May 652°F49.6°F48.2°F52.9°F
May 752.3°F50.4°F47.5°F53.1°F
May 853.8°F51.8°F48°F53.8°F
May 954.3°F51.8°F47.1°F54.3°F
May 1052.5°F52°F48.6°F54°F
May 1152.7°F50.7°F48.2°F54.7°F
May 1253.6°F51.3°F48.7°F54.7°F
May 1351.4°F51.6°F48.7°F54.9°F
May 1451.8°F52.3°F49.1°F55.4°F
May 1552.5°F52.7°F49.5°F56.1°F
Day 2025 2024 Min Max
May 1653.1°F48.9°F48.9°F57.9°F
May 1755.8°F49.8°F49.8°F57.7°F
May 1855.9°F50.5°F50.5°F58.1°F
May 1955.4°F51.1°F48.6°F58.5°F
May 2055.8°F51.8°F51.1°F58.6°F
May 2155.6°F52.7°F51.3°F58.1°F
May 2255.8°F55.4°F51.3°F58.5°F
May 2355.9°F56.7°F49.1°F57.6°F
May 2454.1°F57.2°F52°F58.5°F
May 2554.1°F57.2°F51.6°F59.5°F
May 2655.4°F56.8°F53.4°F60.1°F
May 2755.6°F56.5°F53.8°F61.5°F
May 2856.1°F59.9°F54.3°F63.7°F
May 2955.9°F60.3°F54.9°F64.8°F
May 3056.8°F61.2°F55.2°F64.2°F
May 3155.2°F63°F55.2°F65.1°F
Mastic Beach water temp chart in May

Average water temperature in Mastic Beach in May over a decade

20162017201820192020
52.7°F52.5°F52.2°F52.7°F50.9°F
20212022202320242025
54.1°F53.1°F54.3°F53.4°F53.6°F

Mastic Beach sea state in May

Chart comparing the height of waves in Mastic Beach 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 Mastic Beach in May

Mastic Beach 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
Westhampton52.9°F45.7°F64.8°F
East Quogue52.9°F45.7°F64.8°F
West Sayville54.5°F46°F66.9°F
Fire Island53.8°F45.9°F65.7°F
Flanders53.4°F45.5°F64.9°F
Great River54.9°F46.2°F67.5°F
Great South Bay54.3°F46°F65.7°F
The Hamptons52.7°F45.5°F64.6°F
Hampton Bays52.7°F45.5°F64.6°F

Mastic Beach photo gallery

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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 Mastic Beach 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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