Wupatki National Monument preserves ancestral Puebloan sites, several of which are open to visitors. The Plan Your Visit page via the NPS is a great place to start. Wupatki is high desert with elevations of 4,280' to 5,720', weather conditions can be unpredictable. The current forecast for our area is found here.
Its definitely worth a stop if you're going to Arizona, and be sure and check out Walnut Canyon and Sunset Crater, both National Monuments in the Flagstaff area.
Entrance Fee = $25 or FREE if you have the America the Beautiful Interagency Pass.