JJ Green or Jatujak Green.it's not far from Chatuchak Market,you can walk just a minute to arrive at The Market will open on Thursday to Sunday at 5 p.m ,there are mongers.
A lot people are shopping at 6.am to midnight or after midnight.you can get on the sky train because it's easy to go there ,then you walk just a minute . The weather in Thailand is so hot so don't worry about that! it's not a problem for shopping because The JJ Green always open night .