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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.
For example, the average daily high in San Francisco in July and August is 72 Â°F (22 Â°C), and in Walnut Creek, some 20 miles (32 km) inland, the average daily high in July and August is 90 Â°F (32 Â°C); a temperature gain of approximately one degree (Fahrenheit) per mile.t is common in the summer for temperatures in the valley to reach 120 Â°F (49 Â°C). The highest reliably recorded temperature in the world, 134 Â°F (56.7 Â°C), was recorded in Death Valley on July 10, 1913.