World sea water temperatures

Water temperature in South Portland (ME) in May

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Is it warm enough to swim in South Portland in May? Average water temperature in South Portland in May is 48.9°F and therefore is not suitable for comfortable swimming. The warmest sea in South Portland in May is 59.7°F, and the coldest is 42.6°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in South Portland

Changes water temperature in South Portland in May 2025, 2024

To get an accurate forecast for the water temperature in South Portland for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in South Portland, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of May.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
May 145°F46.2°F42.6°F48.4°F
May 245.5°F46.2°F43.2°F48.4°F
May 346°F46.8°F43.7°F48°F
May 446.6°F47.3°F44.2°F48.7°F
May 546°F47.7°F44.2°F49.3°F
May 645.3°F48.2°F44.8°F48.6°F
May 745.3°F48.4°F44.6°F49.5°F
May 846.6°F48.7°F44.8°F49.8°F
May 944.6°F49.1°F44.6°F50.2°F
May 1045.7°F49.5°F43.9°F50.7°F
May 1147.1°F49.1°F44.6°F50.4°F
May 1248°F49.6°F44.4°F50.4°F
May 1348°F50.4°F44.1°F50.4°F
May 1449.3°F50.9°F44.8°F50.9°F
May 1550.7°F50.7°F45.1°F50.7°F
Day 2025 2024 Min Max
May 1652.2°F52.2°F46.2°F52.2°F
May 1751.6°F52°F45.9°F52°F
May 1852.3°F50.7°F45.5°F53.1°F
May 1951.3°F51.1°F44.8°F55.2°F
May 2050.2°F51.6°F45.1°F54.9°F
May 2148.9°F52.7°F45.5°F55°F
May 2247.7°F53.8°F46.8°F56.1°F
May 2346.2°F53.2°F46.2°F58.1°F
May 2446.8°F52.7°F46.8°F57.7°F
May 2548°F52.3°F48°F57.2°F
May 2649.8°F53.4°F48.7°F59.7°F
May 2750°F53.2°F48.7°F57.7°F
May 2850.9°F53.2°F48.7°F58.1°F
May 2951.4°F54.5°F48.7°F57.7°F
May 3051.6°F54.3°F48.9°F57.4°F
May 3151.3°F54.3°F49.5°F58.8°F
South Portland water temp chart in May

Average water temperature in South Portland in May over a decade

20162017201820192020
48.2°F47.5°F50.2°F47.3°F47.7°F
20212022202320242025
50.2°F49.6°F49.6°F50.7°F48.4°F

South Portland sea state in May

Chart comparing the height of waves in South Portland in May over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in South Portland in May

South Portland water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in May?

Want to know where the water temperature in May is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Temperature in neighboring cities

The nearest locations with the average water temperature in May. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Portland48.9°F42.4°F59.7°F
Peaks Island48.9°F42.6°F59.7°F
Scarborough49.1°F42.4°F60.3°F
Higgins Beach49.1°F42.4°F60.3°F
Pine Point49.1°F42.4°F60.1°F
Cape Elizabeth48.9°F42.4°F60.3°F
Saco49.3°F42.6°F60.3°F
Yarmouth49.1°F42.6°F58.6°F
Casco Bay48.6°F42.4°F59°F
Biddeford Pool49.3°F42.6°F60.8°F

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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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.

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