Sorry, I just came back from a trip to the northwest one month ago.
July-August is the tourist season in Northwest China. Large tracts of green grasslands, golden rape flowers and various Shan Ye flowers are in full bloom, and the scenery is very beautiful. In addition, because most areas in Qinghai are above 3500 meters above sea level, there are many plateaus along the ring road. If you go on the 11th, remember to take down jackets. Cold and rainy weather and high altitude can easily make people feel unwell and cause altitude sickness.
Have a nice trip!