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Water temperature in San Juan Islands (WA) in April

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Is it warm enough to swim in San Juan Islands in April? Average water temperature in San Juan Islands in April is 47.5°F and therefore is not suitable for comfortable swimming. The warmest sea in San Juan Islands in April is 52°F, and the coldest is 45.1°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 April 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 April.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024 Min Max
April 146.4°F48°F45.3°F49.6°F
April 246.9°F47.7°F45.3°F49.6°F
April 346.8°F48°F45.1°F49.6°F
April 446.4°F48°F45.1°F49.3°F
April 547.1°F48°F45.1°F49.1°F
April 647.5°F47.7°F45.5°F49.3°F
April 747.7°F47.3°F45.3°F49.6°F
April 847.7°F47.5°F45.5°F49.5°F
April 947.1°F48°F45.7°F49.6°F
April 1047.3°F46.9°F45.7°F50°F
April 1147.5°F47.1°F45.9°F50.2°F
April 1246.9°F48.2°F45.7°F50°F
April 1347.3°F47.8°F45.9°F49.8°F
April 1447.5°F48.6°F45.7°F49.8°F
April 1547.8°F48.2°F45.9°F49.8°F
Day 2025 2024 Min Max
April 1648.2°F48°F46°F50.2°F
April 1748°F48.4°F46°F50.5°F
April 1848.4°F48.4°F46°F51.1°F
April 1948.4°F48.6°F45.7°F51.3°F
April 2048.2°F48.9°F46°F51.6°F
April 2148.4°F48.7°F45.5°F51.4°F
April 2248.7°F48.4°F45.9°F52°F
April 2348°F48.6°F46°F51.6°F
April 2448.4°F48.7°F46.2°F51.6°F
April 2548.6°F48.7°F46°F51.4°F
April 2648.7°F48.6°F45.9°F51.4°F
April 2749.1°F48.6°F46.2°F51.4°F
April 2849.5°F48.6°F46.4°F51.4°F
April 2949.1°F48.2°F46.8°F51.4°F
April 3048.4°F48.4°F46.6°F51.6°F
San Juan Islands water temp chart in April

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

20162017201820192020
50.5°F48°F47.7°F48°F47.5°F
20212022202320242025
47.5°F46.6°F46.4°F48.2°F47.8°F

San Juan Islands sea state in April

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

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 April?

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

AvrMinMax
Roche Harbor47.3°F44.6°F52.5°F
Oak Bay47.5°F44.8°F51.3°F
Willows Beach47.5°F44.8°F51.3°F
Cadboro Bay47.5°F44.8°F51.3°F
Cordova Bay47.5°F45°F52.3°F
Eastsound47.7°F44.4°F53.6°F
Orcas Island47.7°F44.4°F53.6°F
Bowman Bay48.2°F45.3°F54.3°F
Deception Pass48.2°F45.3°F54.3°F
Lummi Island48°F44.6°F55.2°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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