it is ok travel to china in mid of August, i like nature and historical places??

Hi, in mid of August, it is during the Summer throughout China. So it would have high temperature about 30 C or higher. But you like nature and historical places, these attractions would be much cooler inside. Anyway, you need bear the strong sunshine along your trip. Short-sleeved shirt, short, sunglasses and sunshine prevention cream etc needed to be taken along.
About the natural scenic area and historical places, you can go to Xi'an, Beijing, Jiuzhaigou, Zhangjiajie and other areas for your traveling.