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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 US average is 37. Snowfall is 0 inches. The average US city gets 25 inches of snow per year. The number of days with any measurable precipitation is 55. On average, there are 280 sunny days per year in Green Valley, Arizona. The July high is around 99 degrees.