I was visiting in January. I do not know the weather the rest of the year. The town has access to I-10 which you can just go about anywhere on the 10.
There is plenty of shopping, dining, nightlife and sight-seeing in the area. I highly recommend the piano bar called, "The Big Bang". It is very entertaining for all age groups over 21.
I have only been to Arizona once. I was here during the Month of January 2013. I'm going to assume there are many times of the year to visit.
Not sure about summer months though! Tempe has everything you need and is centrally located.