South Yarmouth water temp

This data the coastal South Yarmouth 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 South Yarmouth

Water temperature in South Yarmouth today is 72.3°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near South Yarmouth was recorded in 2022 and was 74.3°F, and the coldest was recorded in 2007 at 65.7°F. Sea water temperature in South Yarmouth is expected to drop to 68.5°F in the next 10 days. September average water temperature in South Yarmouth is 67.8°F, the minimum temperature is 61.3°F, and the maximum is 76.3°F.

The swimming season in South Yarmouth lasts from July to September. During those months, South Yarmouth water temperature does not drop below 68°F and therefore suitable for comfortable swimming. The average water temperature in South Yarmouth in winter reaches 40.1°F, in spring 45.7°F, in summer the average temperature rises to 68.4°F, and in autumn it is 59.9°F.

South Yarmouth water temperature now

The sea salinity in South Yarmouth is 31.85‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in South Yarmouth 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 South Yarmouth. 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 South Yarmouth. 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 South Yarmouth

South Yarmouth weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
65.1°F	65.7°F	66.7°F	68.9°F

12-15 h	15-18 h	18-21 h	21-24 h
71.1°F	72.3°F	71.2°F	70.2°F

South Yarmouth water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in South Yarmouth. 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 South Yarmouth 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 South Yarmouth

The nearest beaches and cities from South Yarmouth 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
West Dennis	72°F	71.6°F		1' 9"
West Yarmouth	72.3°F	71.6°F		2' 3"
Sea Gull Beach	72.3°F	71.6°F		2' 3"
Seagull Beach	72.3°F	71.6°F		2' 3"
Lewis Bay	72.3°F	71.6°F		2' 3"
Colonial Acres Beach	72.3°F	71.6°F		2' 3"
Hyannis	72.3°F	71.6°F		2' 2"
Bass River	71.4°F	71.6°F		2' 3"
Kalmus Beach	72.3°F	71.6°F		2' 2"
Smugglers Beach	71.4°F	71.6°F		2' 3"

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Our report for South Yarmouth 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.