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Water temperature in San Juan Islands (WA) in October

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Is it warm enough to swim in San Juan Islands in October? Average water temperature in San Juan Islands in October is 50.5°F and therefore is not suitable for comfortable swimming. The warmest sea in San Juan Islands in October is 52.7°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 October 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 October.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
October 153.2°F51.3°F50°F53.2°F
October 252.5°F51.3°F50°F52.5°F
October 352.3°F51.3°F49.8°F52.7°F
October 451.8°F51.1°F49.5°F52.7°F
October 552.2°F50.7°F49.5°F52.7°F
October 651.6°F50.5°F49.8°F52.5°F
October 752.2°F51.3°F50.2°F52.5°F
October 851.8°F51.8°F50°F52.7°F
October 951.6°F50.5°F49.5°F52.3°F
October 1051.4°F50.5°F49.6°F52.3°F
October 1151.1°F50.4°F49.6°F52.2°F
October 1251.4°F50.5°F49.8°F52.2°F
October 1351.4°F51.3°F49.6°F52.2°F
October 1450.9°F51.3°F49.6°F52°F
October 1551.1°F51.1°F48.4°F52.2°F
Day 2025 2024 Min Max
October 1651.1°F51.3°F48.2°F52.2°F
October 1750.9°F51.1°F48.6°F52.2°F
October 1850.7°F50.7°F48.6°F52.2°F
October 1950.9°F50.5°F48.6°F52°F
October 2051.3°F50.4°F49.1°F52.3°F
October 2150.7°F49.6°F48.9°F52.2°F
October 2250.5°F49.6°F48.2°F51.8°F
October 2350.2°F49.5°F48°F51.6°F
October 2450.2°F49.5°F48.2°F51.6°F
October 2550.2°F49.3°F48°F51.6°F
October 2650.4°F49.3°F47.8°F51.8°F
October 2750.4°F49.6°F48.2°F51.8°F
October 2849.8°F49.6°F48.2°F52°F
October 2949.6°F49.5°F48.6°F52.2°F
October 3050°F49.5°F48.4°F51.8°F
October 3149.8°F49.5°F48.4°F52°F
San Juan Islands water temp chart in October

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

20162017201820192020
51.1°F50.5°F50.5°F50.4°F50.4°F
20212022202320242025
50.2°F50.9°F51.6°F50.4°F

San Juan Islands sea state in October

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

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 October?

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

AvrMinMax
Roche Harbor50.7°F47.3°F53.8°F
Oak Bay50.4°F47.8°F52.3°F
Willows Beach50.4°F47.8°F52.3°F
Cadboro Bay50.4°F47.8°F52.3°F
Cordova Bay50.7°F48.2°F53.6°F
Eastsound51.3°F48.2°F54.9°F
Orcas Island51.3°F48.2°F54.9°F
Bowman Bay51.6°F48.2°F55.4°F
Deception Pass51.6°F48.2°F55.4°F
Lummi Island51.4°F48.2°F55.9°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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