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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.
Report Abuse. You can tan in 60 degree weather during the summer. The driving factor is your exposure to UV radiation, not the temperature of the air. In northern California, the high temperatures are only in the 70s and you will still burn.eport Abuse. You can tan in 60 degree weather during the summer. The driving factor is your exposure to UV radiation, not the temperature of the air. In northern California, the high temperatures are only in the 70s and you will still burn.