Cos Cob water temp

This data the coastal Cos Cob 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 Cos Cob

Water temperature in Cos Cob today is 70°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Cos Cob was recorded in 2021 and was 72.9°F, and the coldest was recorded in 2020 at 68°F. Sea water temperature in Cos Cob is expected to drop to 67.6°F in the next 10 days. September average water temperature in Cos Cob is 71.6°F, the minimum temperature is 65.7°F, and the maximum is 78.1°F.

The swimming season in Cos Cob lasts from July to September. During those months, Cos Cob water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in Cos Cob in winter reaches 40.6°F, in spring 46.6°F, in summer the average temperature rises to 70.2°F, and in autumn it is 63.7°F.

Cos Cob water temperature now

The ocean salinity in Cos Cob is 27.70‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Cos Cob 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 Cos Cob. 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 Cos Cob. Data in table shown for September 25, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Cos Cob

Cos Cob weather forecast

Current temperature and weather

Data in a table show Cos Cob temperature today (September 25, 2025). For more information and forecast for a few days, go to the weather forecast Cos Cob.

0-3 h	3-6 h	6-9 h	9-12 h
68.4°F	68.4°F	69.1°F	71.1°F

12-15 h	15-18 h	18-21 h	21-24 h
72.7°F	72.1°F	71.8°F	72.1°F

Cos Cob water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Cos Cob. 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 Cos Cob 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 Cos Cob

The nearest beaches and cities from Cos Cob 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
Greenwich	70°F	73.4°F		0' 5"
Old Greenwich	70.2°F	71.6°F		0' 4"
Port Chester	70.2°F	71.6°F		0' 5"
Hempstead Harbor	70.2°F	71.6°F		0' 5"
Rye	70.2°F	71.6°F		0' 5"
Glen Cove	70.2°F	71.6°F		0' 5"
Bayville	70.2°F	71.6°F		0' 5"
Glenwood Landing	70°F	71.6°F		0' 4"
Sea Cliff	70°F	71.6°F		0' 4"
Rye Beach	70°F	71.6°F		0' 4"

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Our report for Cos Cob 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.