San Juan Islands Sea Temperature

Looking to find out what the sea water temperature in San Juan Islands is for today and the next few days? Below are data and charts that will give you information about sea temperatures in San Juan Islands and nearby locations.

Analysis and forecast for San Juan Islands water temperatures

The water temperature in San Juan Islands today is lower than the average temperature of 10.14° C (50.26° F) and the temperature on this day last year, 26th April 2023, was 8.88° C (47.98° F).

The chart and table below shows the change in water temperature in San Juan Islands over the last 30 days:

The actual nearshore temperatures may vary by several degrees and this can also be heavily affected by weather. Strong winds can cause cold, deep waters to replace the surface waters that had been warmed by the sun, and heavy rain can also reduce the temperature of the sea surface temperature as well.

Water temperature in San Juan Islands by month

The chart below shows the monthly average water temperature in San Juan Islands.

For more detailed information on how the sea temperature in San Juan Islands changes for each month of the year, choose from the months below.

San Juan Islands map and nearby water temperatures

Locations near San Juan Islands

Friday Harbor

United States, North America

3.03 miles away

Lopez Island

United States, North America

7.78 miles away

Orcas Island

United States, North America

8.85 miles away

Olga

United States, North America

12.05 miles away

Eastsound

United States, North America

12.75 miles away

Victoria

Canada, North America

15.67 miles away

The highest temperature in United States today is 27.29° C (81.12° F) in Duck Key. The lowest is in Barrow, where the temperature of the water is -1.48° C (29.33° F).

Why measure sea surface temperatures (SST) in San Juan Islands?

The ocean covers about 71% of the Earth's surface, and scientists record the sea surface temperature (SST) of locations such as San Juan Islands because they want to understand and learn how the ocean communicates with the atomosphere of Earth.

SST is one measure that provides information on the global climate, and it can be used to predict the weather in San Juan Islands as well as atmospheric model simulations and to study marine ecosystems in the area.

Data source and citation

Raw data for the calculations made to find the sea surface temperature in San Juan Islands comes from the National Oceanic and Atmospheric Administration (NOAA) and their 1/4° daily Optimum Interpolation Sea Surface Temperature.

The water temperature data is constructed by combining observations from different platforms (satellites, ships, buoys, and Argo floats) on a regular global grid. A spatially complete sea surface temperature map is then built by interpolating to fill in gaps in the data.

If you'd like to use any of the information above in the format it is presented, please use the citation tool below.