St. augustine is located in Flagler county Florida with a geographic area of 9.5 square miles. The total population in St. augustine is 15,065 with 42.1% male and 57.9% female. Children under age 5 represent 2.2% of the population, under age 18 equal 8.7% of the population and over age 65 is 25.5% of the population. The median household income is $60,455, per capita income is $33,060. There are a total of 5,828 housing units with 65.3% owner occupied. Education includes 21.1% of residents that are high school graduates and 41.8% with a bachelor's degree or higher. The average temperature in St. augustine in the summer is 80 degrees, and in the winter 56 degrees.