World sea water temperatures

Water temperature in Deer Isle (ME) in September

Is it warm enough to swim in Deer Isle in September? Average water temperature in Deer Isle in September is 57.9°F and therefore is not suitable for comfortable swimming. The warmest sea in Deer Isle in September is 63°F, and the coldest is 54.1°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Deer Isle

Changes water temperature in Deer Isle in September 2025, 2024

To get an accurate forecast for the water temperature in Deer Isle for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Deer Isle, 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 159.7°F59.9°F57°F63°F
September 260.8°F59.7°F56.8°F62.1°F
September 360.1°F59°F55.4°F62.1°F
September 459.9°F59.4°F55.6°F61.2°F
September 5 58.6°F55.9°F61.3°F
September 6 58.6°F56.1°F62.2°F
September 7 58.6°F55.9°F61.2°F
September 8 58.5°F55.9°F62.2°F
September 9 58.3°F55.9°F61.5°F
September 10 58.1°F56.1°F62.2°F
September 11 58.3°F56.3°F61.7°F
September 12 58.6°F55.8°F60.8°F
September 13 58.8°F55.6°F61.3°F
September 14 58.8°F55.8°F61.2°F
September 15 58.3°F55.4°F60.1°F
Day 2025 2024 Min Max
September 16 59°F55°F61.3°F
September 17 57.9°F54.9°F60.8°F
September 18 58.5°F54.7°F60.1°F
September 19 58.1°F54.1°F60.1°F
September 20 57.7°F54.9°F59.2°F
September 21 57.7°F55.4°F59.7°F
September 22 57.7°F55.2°F60.3°F
September 23 57.2°F55.2°F60.1°F
September 24 57.9°F55.2°F60.4°F
September 25 56.8°F55°F59.5°F
September 26 56.7°F55°F60.1°F
September 27 57.7°F54.9°F60.4°F
September 28 56.7°F55°F61°F
September 29 57.2°F55.2°F60.3°F
September 30 56.8°F55.4°F59.5°F
Deer Isle water temp chart in September

Average water temperature in Deer Isle in September over a decade

20152016201720182019
58.6°F58.8°F57.2°F59.4°F57°F
20202021202220232024
57.7°F60.1°F59.4°F58.6°F58.1°F

Deer Isle sea state in September

Chart comparing the height of waves in Deer Isle 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 Deer Isle in September

Deer Isle 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
Stonington57.7°F54.1°F62.8°F
Penobscot Bay58.5°F54.5°F63.1°F
Sedgwick57.9°F54.1°F64°F
Islesboro58.8°F54.7°F64°F
Vinalhaven57.9°F54.1°F63.1°F
Union River Bay57.4°F54°F63.3°F
Marshall Island56.8°F53.4°F62.8°F
Northport59°F54.9°F65.1°F
Swans Island56.7°F53.6°F62.4°F
Ellsworth57.7°F54°F64.2°F

Maine photo gallery

  • Bounty during its last call to Belfast Maine
  • Maine clams - soon to be steamers
  • Sardine Carrier Jacob Pikr Benjamin River Brooklin ME
  • Schooner Timberwind

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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 Deer Isle 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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