South Portland water temp

This data the coastal South Portland 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 South Portland

Water temperature in South Portland today is 61°F. Based on our historical data over a period of ten years, the warmest water in this day in South Portland was recorded in 2021 and was 64°F, and the coldest was recorded in 2013 at 56.8°F. Sea water temperature in South Portland is expected to drop to 57.7°F in the next 10 days. September average water temperature in South Portland is 60.8°F, the minimum temperature is 56.3°F, and the maximum is 68°F.

Throughout the year, the water temperature in South Portland does not rise above 68°F and therefore is not suitable for comfortable swimming. But on some days of September, the water temperature warms up to 68°F and above. The average water temperature in South Portland in winter reaches 41.7°F, in spring 43.2°F, in summer the average temperature rises to 61.3°F, and in autumn it is 55.4°F.

South Portland water temperature now

The ocean salinity in South Portland is 30.45‰, and the average salinity of the World Ocean is 35‰.

Surf Forecast in South Portland 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 Portland. 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 Portland. 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 South Portland

South Portland weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
59.2°F	59.4°F	59.5°F	59.7°F

12-15 h	15-18 h	18-21 h	21-24 h
61°F	63.1°F	64°F	64.2°F

South Portland water temperature by month

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

The nearest beaches and cities from South Portland 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
Portland	60.6°F	62.6°F		3' 3"
Peaks Island	60.4°F	62.6°F		3' 3"
Scarborough	61.3°F	62.6°F		3' 6"
Higgins Beach	61.3°F	62.6°F		3' 6"
Pine Point	61.5°F	64.4°F		3' 6"
Crescent Beach	61°F	62.6°F		3' 9"
Cape Elizabeth	60.8°F	62.6°F		3' 9"
Old Orchard Beach	62.1°F	64.4°F		3' 9"
Saco	62.1°F	64.4°F		3' 9"
Yarmouth	61.3°F	62.6°F		2' 6"

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Our report for South Portland 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.