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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.
San Tan Valley, Arizona. 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.