I am going on a tour 16 september 2017 including Shanghai, Beijing, Xian and Hong Kong.

According to the history data, it can be still hot in Beijing, Shanghai and Xian at that time with many cloudy days, and the highest temperature may reach 30 degrees or so. As it will be fall, it may be a little cool in the morning and late night. So you are suggested to prepare summer clothing, long-sleeved shirts and light jacket.

For HK, it will still be hot then and rain will frequently happen. Summer clothing and rainy gear are suggested.