Lake San Marcos is located in California. Lake San Marcos, California has a population of 4,924. Lake San Marcos is less family-centric than the surrounding county with 21.84% of the households containing married families with children. The county average for households married with children is 34.63%.
The median household income in Lake San Marcos, California is $63,599. The median household income for the surrounding county is $70,588 compared to the national median of $57,652. The median age of people living in Lake San Marcos is 58.8 years.
The average high temperature in July is 81.9 degrees, with an average low temperature in January of 43.2 degrees. The average rainfall is approximately 13.6 inches per year, with 1.8 inches of snow per year.