Weather in China

Chengdu

Average Data May June Average High 25/27 27/29 Average 16/18 19/21

Beijing

Average Data May June Average High 26/28 30/32 Average Low 12/14 17/19

Shanghai

Average Data May June Average High 23/25 27/29 Average 14/16 19/21

So the bottom line is to bring more t-shirts than sweaters!! Berms should work as well.