World sea water temperatures

Water temperature in San Juan Islands (WA) in May

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Is it warm enough to swim in San Juan Islands in May? Average water temperature in San Juan Islands in May is 49.5°F and therefore is not suitable for comfortable swimming. The warmest sea in San Juan Islands in May is 53.2°F, and the coldest is 46.8°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in San Juan Islands

Changes water temperature in San Juan Islands in May 2025, 2024

To get an accurate forecast for the water temperature in San Juan Islands for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in San Juan Islands, 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 148.2°F48.4°F46.9°F52.2°F
May 248.9°F48.4°F47.1°F52.7°F
May 348.6°F48.7°F47.1°F53.2°F
May 448.7°F48.7°F46.9°F52.9°F
May 548.7°F48.7°F47.1°F52.7°F
May 649.3°F48.7°F47.3°F52.5°F
May 749.6°F48.6°F46.9°F52.3°F
May 849.3°F48.4°F46.8°F51.8°F
May 949.6°F48.6°F47.5°F52°F
May 1049.5°F49.5°F47.7°F51.8°F
May 1149.5°F49.3°F47.7°F52.2°F
May 1249.6°F49.6°F47.8°F52.2°F
May 1350°F49.3°F47.8°F52.9°F
May 1448.9°F49.6°F48°F52.9°F
May 1549.1°F48.2°F48.2°F52.3°F
Day 2025 2024 Min Max
May 1649.3°F49.8°F48.4°F52°F
May 1749.5°F49.8°F48.7°F52.3°F
May 1849.5°F50.4°F48.4°F52.2°F
May 1949.6°F50°F48.6°F52°F
May 2049.5°F50.5°F48.4°F52.3°F
May 2149.1°F50°F48.7°F52.5°F
May 2249.6°F50°F48.9°F52.3°F
May 2349.5°F50°F48.6°F52.5°F
May 2448.6°F50°F48.6°F52.5°F
May 2548.7°F50°F48.4°F52.5°F
May 2649.3°F49.8°F48.7°F51.6°F
May 2749.6°F49.5°F48.4°F51.6°F
May 2850.4°F49.5°F48.4°F52.7°F
May 2949.3°F50°F48.4°F52.3°F
May 3049.1°F49.8°F48.6°F52.5°F
May 3148.9°F49.8°F48.9°F52.7°F
San Juan Islands water temp chart in May

Average water temperature in San Juan Islands in May over a decade

20162017201820192020
52.2°F50.4°F50.2°F50.2°F49.8°F
20212022202320242025
49.3°F48.6°F49.6°F49.5°F49.3°F

San Juan Islands sea state in May

Chart comparing the height of waves in San Juan Islands 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 San Juan Islands in May

San Juan Islands 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
Roche Harbor50°F46.9°F55.8°F
Oak Bay49.3°F46.8°F52°F
Willows Beach49.3°F46.8°F52°F
Cadboro Bay49.3°F46.8°F52°F
Cordova Bay49.6°F46.9°F54.7°F
Eastsound50.7°F47.1°F57.2°F
Orcas Island50.7°F47.1°F57.2°F
Bowman Bay51.3°F47.5°F56.5°F
Deception Pass51.3°F47.5°F56.5°F
Lummi Island51.4°F46.9°F59°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 San Juan Islands 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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