The average temperature in Arizona varies depending on where in Arizona a person is at. Temperatures change considerably throughout Arizona depending on the time of year and location.In the popular city of Phoenix, the average low is 61. 1 degrees while the average high is 84. 5 degrees.emperatures change considerably throughout Arizona depending on the time of year and location. In the popular city of Phoenix, the average low is 61. 1 degrees while the average high is 84. 5 degrees.