Castine water temp

This data the coastal Castine 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 Castine

Water temperature in Castine today is 58.8°F. Based on our historical data over a period of ten years, the warmest water in this day in Castine was recorded in 2021 and was 60.6°F, and the coldest was recorded in 2013 at 55.8°F. Sea water temperature in Castine is expected to drop to 56.7°F in the next 10 days. September average water temperature in Castine is 59°F, the minimum temperature is 54.9°F, and the maximum is 64.9°F.

Throughout the year, the water temperature in Castine does not rise above 68°F and therefore is not suitable for comfortable swimming. But on some days of July, the water temperature warms up to 68°F and above. The average water temperature in Castine in winter reaches 39.9°F, in spring 41.4°F, in summer the average temperature rises to 58.6°F, and in autumn it is 54.7°F.

Castine water temperature now

The ocean salinity in Castine is 29.54‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Castine 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 Castine. 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 Castine. 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 Castine

Castine weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
53.1°F	51.8°F	52.5°F	55.9°F

12-15 h	15-18 h	18-21 h	21-24 h
58.6°F	58.8°F	59.4°F	61°F

Castine water temperature by month

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

The nearest beaches and cities from Castine 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
Searsport	59.2°F	59°F		0' 7"
Stockton Springs	59°F	59°F		0' 7"
Bayside	59.5°F	59°F		1' 0"
Orland	58.8°F	59°F		0' 7"
Winterport	58.8°F	59°F		0' 7"
Northport	59.5°F	59°F		1' 0"
Islesboro	59°F	59°F		1' 7"
Surry	60.1°F	57.2°F		1' 7"
Lincolnville	59.9°F	59°F		2' 1"
Sedgwick	58.5°F	57.2°F		1' 9"

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Our report for Castine 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.