San Juan Island Real EstateSan Juan Island is located in Washington. San Juan Island, Washington has a population of 1,209. The median household income in San Juan Island, Washington is $49,400. The median household income for the surrounding county is $60,271 compared to the national median of $57,652. The median age of people living in San Juan Island is 43.2 years. San Juan Island WeatherThe average high temperature in July is 70.6 degrees, with an average low temperature in January of 36 degrees. The average rainfall is approximately 27.5 inches per year, with 5.3 inches of snow per year. San Juan Island MapReal estate near San Juan IslandNearby CitiesNearby Cities Homes for Sale |