World sea water temperatures

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 72.1°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 2018 and was 78.1°F, and the coldest was recorded in 2017 at 70°F. Sea water temperature in Cos Cob is expected to be constant 72.1°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


September 5, 2025
today temp
72.1°F
September 4, 2025
yesterday temp
71.1°F


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 5, 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

0-3 h3-6 h6-9 h9-12 h
0' 8"0' 5"0' 3"0' 1"
0.2 m0.13 m0.07 m0.03 m
12-15 h15-18 h18-21 h21-24 h
0' 1"0' 2"0' 9"0' 9"
0.03 m0.05 m0.23 m0.23 m

Surf report in Cos Cob

Cos Cob wave height and direction

Cos Cob weather forecast

Cos Cob wind speed and direction

Current temperature and weather

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

0-3 h3-6 h6-9 h9-12 h
69.4°F69.1°F69.3°F71.8°F
12-15 h15-18 h18-21 h21-24 h
79.3°F83.8°F79.5°F75.9°F

You may also be interested in other sections of our site for Cos Cob: Sunrise and Sunset, Tides

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

MonthAvrMinMax
January39.6°F33.1°F47.7°Fcold
Ocean water temperature in Cos Cob in January
February36.5°F32°F41.5°Fcold
Ocean water temperature in Cos Cob in February
March38.8°F33.4°F48.6°Fcold
Ocean water temperature in Cos Cob in March
April45.7°F38.1°F52.9°Fcold
Ocean water temperature in Cos Cob in April
May55.2°F47.8°F65.5°Fcold
Ocean water temperature in Cos Cob in May
June64.8°F55.9°F72.9°Fcold
Ocean water temperature in Cos Cob in June
July72°F65.7°F77.4°Fwarm
Ocean water temperature in Cos Cob in July
August73.8°F68.2°F78.3°Fwarm
Ocean water temperature in Cos Cob in August
September71.6°F65.7°F78.1°Fwarm
Ocean water temperature in Cos Cob in September
October64.6°F56.7°F72.5°Fcold
Ocean water temperature in Cos Cob in October
November54.9°F46.2°F62.8°Fcold
Ocean water temperature in Cos Cob in November
December46°F39.4°F53.1°Fcold
Ocean water temperature in Cos Cob in December

Chart monthly average water temperature in Cos Cob

Water temperature in Cos Cob

Where is the warmest sea water in the world?

If you want to plan a vacation on the beach and enjoy the warm sea, choose the day of the year, region and the minimum comfortable sea/ocean temperature that interests you. As a result, you will get a list of countries and cities in which the average sea temperature or maximum temperature on this day over the past 10 years exceeds your chosen value

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Nearby beaches and cities

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

WaterWeatherWave
Greenwich72.3°F84.2°F0' 5"
Old Greenwich72.1°F84.2°F0' 5"
Port Chester72°F86°F0' 5"
Hempstead Harbor72°F84.2°F0' 5"
Rye72°F84.2°F0' 5"
Glen Cove72°F84.2°F0' 5"
Bayville71.8°F84.2°F0' 5"
Glenwood Landing72°F84.2°F0' 5"
Sea Cliff72°F84.2°F0' 5"
Rye Beach72°F84.2°F0' 5"

Connecticut 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 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.

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