Half moon bay is located in San mateo county California with a geographic area of 6.2 square miles. The total population in Half moon bay is 12,583 with 46.1% male and 53.9% female. Children under age 5 represent 5.6% of the population, under age 18 equal 18.5% of the population and over age 65 is 22.3% of the population. The median household income is $131,233, per capita income is $70,090. There are a total of 4,721 housing units with 67.0% owner occupied. Education includes 12.2% of residents that are high school graduates and 57.3% with a bachelor's degree or higher. The average temperature in Half moon bay in the summer is 67 degrees, and in the winter 43 degrees.