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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 is located at (33.170462, -111.572170 San Tan Valley is located in the unincorporated area between the towns of Queen Creek to the north and west, Apache Junction to the north, and Florence to the south.