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San Tan Valley, AZ Weather. The average temperature of San Tan Valley is 71.43Â°F, which is much higher than the Arizona average temperature of 65.97Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #76.
Sponsored Topics. San Tan Valley is a Census-designated place in northern Pinal County, Arizona. It is a bedroom community located in the Phoenix metropolitan area's southeastern suburbs. As of the census of 2010, the population of San Tan Valley was 81,321. San Tan Valley derives its name from the nearby San Tan Mountains.