Walnut Beach water temp

This data the coastal Walnut 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 Walnut Beach

Water temperature in Walnut Beach today is 71.2°F. Based on our historical data over a period of ten years, the warmest water in this day in the Long Island Sound near Walnut Beach was recorded in 2018 and was 78.1°F, and the coldest was recorded in 2017 at 70.3°F. Sea water temperature in Walnut Beach is expected to rise to 72°F in the next 10 days. September average water temperature in Walnut Beach is 71.6°F, the minimum temperature is 67.1°F, and the maximum is 78.1°F.

The swimming season in Walnut Beach lasts from July to September. During those months, Walnut Beach water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Walnut Beach in winter reaches 41°F, in spring 45.5°F, in summer the average temperature rises to 70.2°F, and in autumn it is 64.2°F.

Walnut Beach water temperature now

Surf Forecast in Walnut 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 Walnut 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 Walnut Beach. Data in table shown for September 5, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Walnut Beach

Walnut Beach weather forecast

Current temperature and weather

Data in a table show Walnut Beach temperature today (September 5, 2025). For more information and forecast for a few days, go to the weather forecast Walnut Beach.

0-3 h	3-6 h	6-9 h	9-12 h
69.3°F	69.1°F	68.9°F	70.3°F

12-15 h	15-18 h	18-21 h	21-24 h
74.1°F	79.9°F	80.2°F	74.5°F

Walnut Beach water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Walnut 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 Walnut 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

Chart monthly average water temperature in Walnut Beach

The nearest beaches and cities from Walnut Beach 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
Wildermere Beach	71.2°F	80.6°F		0' 11"
Silver Sands	71.4°F	82.4°F		1' 1"
Jennings Beach	71.6°F	78.8°F		0' 10"
East Setauket	71.2°F	82.4°F		0' 8"
Stony Brook	71.4°F	82.4°F		0' 9"
Mount Sinai	71.1°F	82.4°F		0' 9"
Port Jefferson	71.1°F	82.4°F		0' 9"
Shoreham	71.2°F	80.6°F		0' 8"
Westport	71.8°F	78.8°F		0' 9"
Compo Beach	71.8°F	78.8°F		0' 9"

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Our report for Walnut 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.