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Water temperature in San Juan Islands (WA) in June

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Is it warm enough to swim in San Juan Islands in June? Average water temperature in San Juan Islands in June is 51.4°F and therefore is not suitable for comfortable swimming. The warmest sea in San Juan Islands in June is 55.9°F, and the coldest is 47.8°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 June 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 June.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
June 147.8°F49.8°F47.8°F52.2°F
June 249.6°F49.8°F49.1°F52.2°F
June 350.5°F50.2°F49.3°F52.9°F
June 452°F50.2°F48.6°F53.4°F
June 551.3°F49.3°F48.7°F53.8°F
June 652°F49.3°F48.9°F53.6°F
June 752.7°F49.8°F48.9°F53.4°F
June 853.4°F50.2°F48.9°F53.8°F
June 952.7°F50.4°F48.9°F54.1°F
June 1052.9°F50.2°F48.6°F53.8°F
June 1152.3°F51.1°F48.6°F53.4°F
June 1251.6°F50.4°F48.7°F53.8°F
June 1351.4°F49.8°F48.9°F54.1°F
June 1451.1°F49.6°F49.3°F54.9°F
June 1550.9°F50.5°F49.3°F55.2°F
Day 2025 2024 Min Max
June 1650.7°F50.4°F49.8°F53.6°F
June 1750.5°F52.3°F50.4°F53.4°F
June 1850.7°F52°F50.5°F53.4°F
June 1951.4°F51.3°F50.4°F53.8°F
June 2051.6°F52°F50.4°F53.4°F
June 2151.6°F52°F50.5°F53.6°F
June 22 52.3°F50.4°F53.6°F
June 2351.8°F51.3°F50.5°F54°F
June 2450.7°F51.4°F50.7°F54.3°F
June 2550.7°F50.9°F50.7°F54.7°F
June 2650.9°F51.6°F50.9°F55.6°F
June 2750.2°F51.8°F50°F55.9°F
June 2851.1°F51.1°F50.4°F55.9°F
June 2950.5°F52.2°F49.8°F55.6°F
June 3051.3°F51.8°F50.2°F55.4°F
San Juan Islands water temp chart in June

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

20162017201820192020
53.1°F52.3°F51.4°F51.8°F51.3°F
20212022202320242025
51.1°F50.9°F51.3°F50.9°F51.3°F

San Juan Islands sea state in June

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

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 June?

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

AvrMinMax
Roche Harbor52.3°F48.6°F58.8°F
Oak Bay50.9°F48°F55°F
Willows Beach50.9°F48°F55°F
Cadboro Bay50.9°F48°F55°F
Cordova Bay51.6°F48.7°F58.3°F
Eastsound53.8°F49.6°F59.5°F
Orcas Island53.8°F49.6°F59.5°F
Bowman Bay53.4°F49.1°F58.8°F
Deception Pass53.4°F49.1°F58.8°F
Lummi Island54.1°F49.6°F61°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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