Sullivan water temp

This data the coastal Sullivan 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 Sullivan

Water temperature in Sullivan today is 58.1°F. Based on our historical data over a period of ten years, the warmest water in this day in Sullivan was recorded in 2021 and was 60.1°F, and the coldest was recorded in 2013 at 53.4°F. Sea water temperature in Sullivan is expected to drop to 55°F in the next 10 days. September average water temperature in Sullivan is 56.8°F, the minimum temperature is 53.1°F, and the maximum is 65.1°F.

Throughout the year, the water temperature in Sullivan does not rise above 68°F and therefore is not suitable for comfortable swimming. The average water temperature in Sullivan in winter reaches 41°F, in spring 41°F, in summer the average temperature rises to 55.8°F, and in autumn it is 53.6°F.

Sullivan water temperature now

The ocean salinity in Sullivan is 29.80‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Sullivan 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 Sullivan. 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 Sullivan. 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 Sullivan

Sullivan weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
52°F	50.4°F	48.9°F	55.9°F

12-15 h	15-18 h	18-21 h	21-24 h
57.4°F	56.7°F	57.6°F	59.5°F

Sullivan water temperature by month

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

The nearest beaches and cities from Sullivan 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
Trenton	58.1°F	59°F		1' 1"
Lamoine	58.3°F	57.2°F		1' 5"
Winter Harbor	56.7°F	57.2°F		2' 9"
Sand Beach	56.5°F	57.2°F		2' 4"
Acadia	55.8°F	57.2°F		3' 1"
Seal Harbor Beach	55.8°F	57.2°F		3' 1"
Southwest Harbor	55.9°F	57.2°F		2' 7"
Ellsworth	58.3°F	57.2°F		1' 3"
Surry	60.1°F	57.2°F		1' 7"
Tremont	56.3°F	57.2°F		2' 2"

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Our report for Sullivan 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.