Mastic Beach water temp
This data the coastal Mastic Beach ocean 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 ocean temperature in Mastic Beach
Water temperature in Mastic Beach today is 46°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Mastic Beach was recorded in 2015 and was 52.9°F, and the coldest was recorded in 2010 at 45°F. Sea water temperature in Mastic Beach is expected to rise to 46.9°F in the next 10 days. December average water temperature in Mastic Beach is 49.1°F, the minimum temperature is 42.3°F, and the maximum is 55.6°F.
The swimming season in Mastic Beach lasts from July to September. During those months, Mastic Beach water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Mastic Beach in winter reaches 44.2°F, in spring 46.4°F, in summer the average temperature rises to 69.3°F, and in autumn it is 63.3°F.
Mastic Beach water temperature now
| December 17, 2025 |
|---|
| today temp |
| 46°F |
| December 16, 2025 |
|---|
| yesterday temp |
| 45.1°F |
Surf Forecast in Mastic Beach 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 Mastic Beach. 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 Mastic Beach. Data in table shown for December 17, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
| 2' 8" | 2' 11" | 3' 5" | 3' 10" |
| 0.81 m | 0.89 m | 1.03 m | 1.16 m |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
| 4' 5" | 4' 9" | 5' 0" | 5' 3" |
| 1.34 m | 1.44 m | 1.52 m | 1.59 m |
Surf report in Mastic Beach
Mastic Beach weather forecast
Current temperature and weather
Data in a table show Mastic Beach temperature today (December 17, 2025). For more information and forecast for a few days, go to the weather forecast Mastic Beach.
| 0-3 h | 3-6 h | 6-9 h | 9-12 h |
|---|---|---|---|
 | | |  |
| 25.7°F | 26.8°F | 30.6°F | 38.3°F |
| 12-15 h | 15-18 h | 18-21 h | 21-24 h |
|---|---|---|---|
 |  | | |
| 41.4°F | 42.4°F | 42.8°F | 39°F |
You may also be interested in other sections of our site for Mastic Beach: Sunrise and Sunset, Tides
Mastic Beach water temperature by month
These figures shows the average, minimum and maximum monthly sea temperature in Mastic Beach. 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 Mastic Beach 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
| Month | Avr | Min | Max | |
|---|---|---|---|---|
| January | 43.3°F | 37.8°F | 50.9°F | cold |
| Ocean water temperature in Mastic Beach in January | ||||
| February | 40.1°F | 35.1°F | 45.1°F | cold |
| Ocean water temperature in Mastic Beach in February | ||||
| March | 40.8°F | 35.1°F | 50.4°F | cold |
| Ocean water temperature in Mastic Beach in March | ||||
| April | 45.3°F | 37.9°F | 53.1°F | cold |
| Ocean water temperature in Mastic Beach in April | ||||
| May | 53.1°F | 45.9°F | 65.1°F | cold |
| Ocean water temperature in Mastic Beach in May | ||||
| June | 63.1°F | 55.2°F | 72°F | cold |
| Ocean water temperature in Mastic Beach in June | ||||
| July | 71.8°F | 64.9°F | 77.2°F | warm |
| Ocean water temperature in Mastic Beach in July | ||||
| August | 72.7°F | 68°F | 76.8°F | warm |
| Ocean water temperature in Mastic Beach in August | ||||
| September | 69.6°F | 64.4°F | 75.2°F | warm |
| Ocean water temperature in Mastic Beach in September | ||||
| October | 63.9°F | 57.4°F | 70.2°F | cold |
| Ocean water temperature in Mastic Beach in October | ||||
| November | 56.5°F | 50°F | 63.1°F | cold |
| Ocean water temperature in Mastic Beach in November | ||||
| December | 49.1°F | 42.3°F | 55.6°F | cold |
| Ocean water temperature in Mastic Beach in December | ||||
Chart monthly average water temperature in Mastic Beach
