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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.
A haboob hits the South-East Valley, Gilbert, AZ, USA, on 5 July 2011, around 7 p.m., hiding San Tan Mountain completely. Dust storm (haboob) on US 30 in Twin Falls, Idaho on July 4, 2013. Dust storm (haboob) on west side of Twin Falls, Idaho on July 4, 2013.