August is one of the hotest months in Chengdu, but it is still ok to visit Chengdu in August. You can visit Bifengxia Panda Reserve Base, Leshan and Mt. Emei.

i am currently in chengdu and the weather is very mild highs in the mid 80's, however the humidity is very high so be prepared to sweat a lot, and it will rain quit often. i would recomend the terr. soldiers, it is a must see if you are in china for any length of time. also the pandas are very neat to see, these are the ones that seem to be very interesting besides the great wall. hope my post was of some help