Stony Brook water temp

This data the coastal Stony Brook sea 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 sea temperature in Stony Brook

Water temperature in Stony Brook today is 70.2°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Stony Brook was recorded in 2021 and was 72.5°F, and the coldest was recorded in 2013 at 68°F. Sea water temperature in Stony Brook is expected to drop to 68°F in the next 10 days. September average water temperature in Stony Brook is 71.6°F, the minimum temperature is 67.1°F, and the maximum is 78.1°F.

The swimming season in Stony Brook lasts from July to September. During those months, Stony Brook water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Stony Brook in winter reaches 41°F, in spring 45.9°F, in summer the average temperature rises to 70.2°F, and in autumn it is 64.2°F.

Stony Brook water temperature now

The sea salinity in Stony Brook is 27.55‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Stony Brook 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 Stony Brook. 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 Stony Brook. Data in table shown for September 26, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Stony Brook

Stony Brook weather forecast

Current temperature and weather

Data in a table show Stony Brook temperature today (September 26, 2025). For more information and forecast for a few days, go to the weather forecast Stony Brook.

0-3 h	3-6 h	6-9 h	9-12 h
69.3°F	68.9°F	69.6°F	71.2°F

12-15 h	15-18 h	18-21 h	21-24 h
72.7°F	72.5°F	72.1°F	70.9°F

Stony Brook water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Stony Brook. 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 Stony Brook 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

Chart monthly average water temperature in Stony Brook

The nearest beaches and cities from Stony Brook with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
New York City	70.5°F	75.2°F		1' 4"
Flax Pond Beach	70.2°F	73.4°F		0' 9"
Fairfield	70.2°F	71.6°F		1' 0"
Jennings Beach	70.2°F	71.6°F		1' 0"
Sunken Meadow	69.8°F	71.6°F		0' 10"
Smithtown	69.8°F	71.6°F		0' 10"
West Meadow Beach	69.8°F	71.6°F		0' 10"
Short Beach	69.8°F	71.6°F		0' 10"
Cedar Beach Mt Sinai	70.2°F	73.4°F		0' 7"
Westport	70.2°F	71.6°F		0' 11"

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Our report for Stony Brook 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.