World sea water temperatures

Water temperature in Deer Isle (ME) in August

Is it warm enough to swim in Deer Isle in August? Average water temperature in Deer Isle in August is 59.5°F and therefore is not suitable for comfortable swimming. The warmest sea in Deer Isle in August is 65.3°F, and the coldest is 55.4°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 August 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 August.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
August 157.6°F59.4°F57°F62.4°F
August 257.4°F58.5°F57.4°F63.7°F
August 358.5°F57.6°F56.5°F62.6°F
August 458.1°F59.2°F55.9°F63.9°F
August 558.6°F60.6°F56.1°F62.4°F
August 658.5°F59.9°F56.7°F63.7°F
August 758.5°F60.1°F56.1°F64.4°F
August 857.7°F58.8°F55.9°F63.9°F
August 959.7°F58.5°F55.4°F62.4°F
August 1059.5°F60.4°F55.9°F62.4°F
August 1159.7°F57°F56.5°F64.8°F
August 1259.5°F59.5°F57.6°F63.3°F
August 1359.5°F62.2°F57°F63.1°F
August 1459.2°F60.6°F56.8°F63.7°F
August 1558.6°F60.4°F57.2°F62.8°F
Day 2025 2024 Min Max
August 1659°F60.6°F55.8°F62.1°F
August 1759.2°F61.2°F57°F62.4°F
August 1858.8°F60.4°F56.5°F64°F
August 1957.4°F59.2°F55.9°F63.3°F
August 2057.6°F61.7°F55.9°F62.4°F
August 2157°F58.5°F56.5°F61.9°F
August 2257.6°F57.7°F56.7°F65.3°F
August 2358.1°F59.5°F56.8°F64.6°F
August 2458.5°F58.6°F56.3°F62.2°F
August 2558.6°F58.1°F57.4°F62.6°F
August 2658.6°F59°F57°F62.6°F
August 2758.3°F59°F57.2°F62.4°F
August 2858.5°F59.4°F57.2°F61.5°F
August 2959°F58.6°F56.8°F61.5°F
August 3059.7°F59°F57.4°F62.2°F
August 3159.7°F58.1°F57°F62.4°F
Deer Isle water temp chart in August

Average water temperature in Deer Isle in August over a decade

20162017201820192020
60.3°F58.1°F61°F58.8°F60.4°F
20212022202320242025
61.3°F61.7°F60.1°F59.4°F58.3°F

Deer Isle sea state in August

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

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 August?

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

AvrMinMax
Stonington59.4°F55.2°F65.3°F
Penobscot Bay60.4°F55.9°F66.7°F
Sedgwick59.4°F54.1°F67.3°F
Islesboro61.2°F55.9°F70°F
Vinalhaven59.7°F55.9°F65.5°F
Union River Bay58.8°F53.6°F66.4°F
Marshall Island58.3°F54.5°F65.5°F
Northport61.7°F55.9°F71.1°F
Swans Island57.7°F54°F65.5°F
Ellsworth59.4°F53.8°F68.4°F

Maine photo gallery

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  • 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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