World sea water temperatures

Water temperature in Mastic Beach (NY) in December

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Is it warm enough to swim in Mastic Beach in December? Average water temperature in Mastic Beach in December is 49.1°F and therefore is not suitable for comfortable swimming. The warmest sea in Mastic Beach in December is 55.6°F, and the coldest is 42.3°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 December 2024, 2023

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 December.

You can choose any other years:

Year 1:   Year 2:


Day 2024 2023 Min Max
December 153.6°F52.7°F50.2°F55.6°F
December 253.1°F51.8°F50.4°F54.3°F
December 352.7°F50.9°F49.3°F54.5°F
December 452.9°F52.2°F49.5°F53.8°F
December 550.9°F51.8°F49.5°F54.9°F
December 650.4°F51.4°F49.3°F53.8°F
December 750.2°F51.4°F48.9°F53.4°F
December 850.4°F51.4°F47.5°F53.1°F
December 950°F51.4°F47.7°F53.6°F
December 1049.5°F51.4°F47.7°F53.2°F
December 1149.3°F50.5°F47.1°F53.2°F
December 1249.1°F49.6°F47.1°F52.9°F
December 1348.6°F49.5°F46.6°F52.5°F
December 1448.4°F49.5°F46.6°F52.7°F
December 1548.2°F48.9°F46.2°F53.2°F
Day 2024 2023 Min Max
December 1647.8°F48.6°F44.6°F53.2°F
December 1748°F48°F45°F52.9°F
December 1848°F48.9°F45.1°F52.5°F
December 1948.4°F48.9°F45°F52.2°F
December 2048°F48.7°F45.9°F52.3°F
December 2147.3°F48.2°F44.8°F52°F
December 2246.8°F48°F44.2°F51.8°F
December 2347.1°F47.5°F44.4°F51.8°F
December 2446.2°F46.8°F42.8°F52.3°F
December 2546°F48°F43.2°F51.6°F
December 2645°F47.8°F43.7°F51.6°F
December 2745°F47.1°F44.1°F51.8°F
December 2844.8°F46.6°F42.6°F51.6°F
December 2945°F49.3°F42.8°F51.4°F
December 3045.3°F48.4°F43°F50.9°F
December 3145.5°F48.4°F42.3°F51.1°F
Mastic Beach water temp chart in December

Average water temperature in Mastic Beach in December over a decade

20152016201720182019
52.7°F49.5°F50.2°F47.1°F47.8°F
20202021202220232024
50.5°F51.3°F48.9°F49.5°F48.4°F

Mastic Beach sea state in December

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

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 December?

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

AvrMinMax
New York City46.8°F38.7°F54.3°F
Westhampton49.3°F42.4°F56.1°F
East Quogue48.9°F41.7°F55.2°F
West Sayville47.8°F41°F54°F
Fire Island48.7°F41.7°F54.9°F
Flanders47.7°F40.3°F53.4°F
Great River47.7°F39.9°F53.8°F
Great South Bay48.2°F41.4°F54°F
The Hamptons49.3°F42.3°F56.3°F
Hampton Bays49.3°F42.3°F56.3°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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