Deer Isle water temp

This data the coastal Deer Isle 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 Deer Isle

Water temperature in Deer Isle today is 59.9°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Deer Isle was recorded in 2018 and was 61.3°F, and the coldest was recorded in 2017 at 55.9°F. Sea water temperature in Deer Isle is expected to drop to 58.3°F in the next 10 days. September average water temperature in Deer Isle is 57.9°F, the minimum temperature is 54.1°F, and the maximum is 63°F.

Throughout the year, the water temperature in Deer Isle does not rise above 68°F and therefore is not suitable for comfortable swimming. The average water temperature in Deer Isle in winter reaches 40.6°F, in spring 41.2°F, in summer the average temperature rises to 56.5°F, and in autumn it is 54.3°F.

Deer Isle water temperature now

The ocean salinity in Deer Isle is 30.26‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Deer Isle 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 Deer Isle. 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 Deer Isle. 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 Deer Isle

Deer Isle weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
58.5°F	58.6°F	58.3°F	58.3°F

12-15 h	15-18 h	18-21 h	21-24 h
58.8°F	59.4°F	59.9°F	60.1°F

Deer Isle water temperature by month

These figures shows the average, minimum and maximum monthly sea temperature in Deer Isle. 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 Deer Isle 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 Deer Isle

The nearest beaches and cities from Deer Isle 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
Stonington	59.4°F	59°F		2' 5"
Penobscot Bay	61.2°F	66.2°F		2' 6"
Sedgwick	60.1°F	59°F		1' 11"
Islesboro	62.2°F	66.2°F		2' 1"
Vinalhaven	61.2°F	59°F		2' 9"
Union River Bay	59.9°F	60.8°F		1' 11"
Marshall Island	58.8°F	60.8°F		3' 1"
Northport	63°F	68°F		1' 6"
Swans Island	59.2°F	60.8°F		3' 1"
Ellsworth	60.6°F	60.8°F		1' 5"

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Deer Island

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Our report for Deer Isle 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.