Monhegan water temp

This data the coastal Monhegan 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 Monhegan

Water temperature in Monhegan today is 58.3°F. Based on our historical data over a period of ten years, the warmest water in this day in the Atlantic Ocean near Monhegan was recorded in 2021 and was 62.2°F, and the coldest was recorded in 2013 at 55°F. Sea water temperature in Monhegan is expected to drop to 56.1°F in the next 10 days. September average water temperature in Monhegan is 59°F, the minimum temperature is 54.9°F, and the maximum is 65.7°F.

Throughout the year, the water temperature in Monhegan does not rise above 68°F and therefore is not suitable for comfortable swimming. The average water temperature in Monhegan in winter reaches 43.5°F, in spring 42.4°F, in summer the average temperature rises to 58.8°F, and in autumn it is 54.9°F.

Monhegan water temperature now

The ocean salinity in Monhegan is 31.22‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in Monhegan 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 Monhegan. 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 Monhegan. 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 Monhegan

Monhegan weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
55°F	56.3°F	57.4°F	58.8°F

12-15 h	15-18 h	18-21 h	21-24 h
59.7°F	59.9°F	61°F	62.1°F

Monhegan water temperature by month

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

The nearest beaches and cities from Monhegan 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
Christmas Cove	59.4°F	60.8°F		3' 2"
Cushing	59.2°F	60.8°F		3' 0"
Friendship	59.9°F	60.8°F		2' 9"
Waldoboro	59.9°F	60.8°F		2' 9"
Southport	59.5°F	60.8°F		2' 10"
Saint George	59°F	59°F		3' 0"
Boothbay Harbor	59.7°F	62.6°F		2' 5"
Reid State Park	59.7°F	62.6°F		3' 4"
Georgetown	59.7°F	62.6°F		3' 4"
Popham Beach	59.7°F	62.6°F		3' 11"

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Monhegan Island

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Our report for Monhegan 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.