San luis is located in Yuma county Arizona with a geographic area of 34.0 square miles. The total population in San luis is 33,875 with 54.4% male and 45.6% female. Children under age 5 represent 7.9% of the population, under age 18 equal 29.1% of the population and over age 65 is 8.3% of the population. The median household income is $41,648, per capita income is $14,784. There are a total of 8,356 housing units with 66.4% owner occupied. Education includes 15.1% of residents that are high school graduates and 10.2% with a bachelor's degree or higher. The average temperature in San luis in the summer is 89 degrees, and in the winter 49 degrees.