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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.
Items of Interest. San Tan Valley. San Tan Valley is Pinal Countyâs newest and largest named area. Approximately 80,000 people call San Tan Valley home. The community is nestled among the foothills of the San Tan Mountains and boasts a wonderful park and recreation area, the San Tan Mountain Park.