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Water temperature in South Portland (ME) in September

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Is it warm enough to swim in South Portland in September? Average water temperature in South Portland in September is 60.8°F and therefore is not suitable for comfortable swimming. The warmest sea in South Portland in September is 68°F, and the coldest is 56.3°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 September 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 September.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
September 161.9°F63.1°F60.8°F65.7°F
September 263.9°F63°F60.1°F66°F
September 362.8°F61.5°F59.2°F65.8°F
September 463.3°F61.7°F58.8°F66.4°F
September 562.8°F61.7°F58.8°F67.5°F
September 662.1°F61.7°F59°F66.7°F
September 761.5°F61.7°F58.6°F67.6°F
September 860.1°F60.3°F58.3°F68°F
September 960.3°F58.6°F58.3°F66.6°F
September 1060.3°F59.9°F58.3°F66.7°F
September 1161°F59.4°F58.3°F66°F
September 1261°F59.2°F57.6°F65.7°F
September 1361.2°F60.8°F57.4°F65.1°F
September 1461.9°F61.5°F57.6°F65.8°F
September 1562.4°F61°F56.8°F64.2°F
Day 2025 2024 Min Max
September 1662.1°F61°F57°F62.8°F
September 1762.6°F60.6°F57°F63°F
September 1863.3°F60.8°F56.8°F63.3°F
September 1963°F61.2°F56.3°F63°F
September 2061.9°F62.4°F56.7°F63°F
September 2161.2°F61.5°F57.2°F63.1°F
September 2260.8°F61.2°F56.7°F63.7°F
September 2361.3°F59.9°F57°F63.9°F
September 2461°F59.2°F56.5°F64°F
September 25 58.5°F56.8°F64°F
September 26 58.6°F56.8°F63.9°F
September 27 59.7°F57.4°F63.7°F
September 28 59.4°F57.6°F63.3°F
September 29 59.9°F57°F63°F
September 30 60.1°F57.4°F62.1°F
South Portland water temp chart in September

Average water temperature in South Portland in September over a decade

20152016201720182019
61.7°F61.7°F59.9°F62.4°F60.3°F
20202021202220232024
59.9°F63.1°F61.7°F62.6°F60.6°F

South Portland sea state in September

Chart comparing the height of waves in South Portland in September 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 September

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 September?

Want to know where the water temperature in September 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 September. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
Portland60.8°F56.3°F67.5°F
Peaks Island60.8°F56.7°F67.5°F
Scarborough61.3°F57°F68.4°F
Higgins Beach61.3°F57°F68.4°F
Pine Point61.3°F57°F68.9°F
Crescent Beach61.2°F56.8°F68.2°F
Cape Elizabeth61.2°F57°F68°F
Old Orchard Beach61.5°F57°F69.1°F
Saco61.5°F57°F69.1°F
Yarmouth60.6°F56.3°F68.2°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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