Dewees Island Real EstateDewees Island real estate listings include condos, townhomes, and single family homes for sale. Commercial properties are also available. If you see a property you’re interested in, contact a Dewees Island real estate agent to arrange a tour today! Dewees Island, South Carolina has a population of 2,166. The median household income in Dewees Island, South Carolina is $102,656. The median household income for the surrounding county is $57,882 compared to the national median of $57,652. The median age of people living in Dewees Island is 55.7 years. Dewees Island WeatherThe average high temperature in July is 90.9 degrees, with an average low temperature in January of 37.3 degrees. The average rainfall is approximately 49.9 inches per year, with 0 inches of snow per year. Nearby Homes for Sale |