Hossein from Iran,during Oct.16th-28 in guangzhou, possible rain, and cold,need heavy clothing ?

No, there won't be heavy rain during that time. I just searched latest weather report which says that on Oct. 16, it will rain lightly and in the next days during your trip, it will be sunny, with the temeprature range of 16C-26C. Thus you don't need heavy clothes at all. Just prepare some summer clothes, light jacket and pants.