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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.
The Salt River Valley Region in which Scottsdale sits is known as the Valley of the Sun for good reason -- it is sunny more than 330 days a year. From May through September, temperatures routinely exceed 100 degrees F. and often climb over 110 degrees F. Short-lived, late-day thunderstorms, often accompanied by high winds, occur from July thru mid-September (the Monsoon season).