August in China - weather wise - is this a good time to visit?

Will you go to Beijing and Guangzhou in early or late August? I suggest you go in late August when it will come to the early autumn and will be ralatively cooler. In late August, it is usually sunny with little rain in Beijing, but it is still hot in Guangzhou and with much rain.
If you will visit the two cities, I think you can delay your trip to September when it is sunny and cool in the two cities.