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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.
Monument Valley weather averages. Check out the Monument Valley weather averages before you book your next holiday to Arizona. The warmest month in Monument Valley is July with an average maximum temperature of 34Â°C. The sunniest month is June with on average 12 hours of bright sunshine per day. The month with the least number of days with some rain is June with 3 days.