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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.
Summer temp-ertures in the valley average well over 100 degrees, and the region receives a little less than two inches of rain per year. The park, however, also features incredible sand dunes, colorful badlands, rocky canyons, and hearty animals that have adapted to the harsh climate.