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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 33Â°10â²13â³N 111Â°34â²20â³Wï»¿ / ï»¿33.17028Â°N 111.57222Â°Wï»¿ / 33.17028; -111.57222 (33.170462, -111.572170). San Tan Valley is located in the unincorporated area between the towns of Queen Creek to the north and west, and Florence to the south.