I'm traveling July 11-24 Shanghai, Wuhan, Chongqing, Xian, Beijing? How will the weather be?

The weather of the whole nation should be mainly sunny during that period. And the temperature of the above cities might be around 75-90F. Short-sleeved shirts, skirts, and shorts should be appropriate outfits. Sometimes there may have showers. You'd better bring an umbrella along with you.