What is the weather like in Chongqing and Jiuzhaigou? Wear long sleeves or short sleeves? Do you want a sweater?

Chongqing is very hot. Wearing short sleeves is definitely ok.

Jiuzhaigou is a plateau mountain climate type, belonging to the alpine region. You can change into sweaters and winter clothes when you arrive in Chuanzhusi town. It's actually not cold to go to Jiuzhaigou. You can wear autumn clothes, but I suggest taking a sweater in case of sudden climate change.

Have a nice trip. Let me remind you that when you go to Jiuzhaigou, the tour guide will take you to buy Tibetan medicine, not jewelry. I was cheated by 1600, bought a bunch of junk Tibetan medicine, and said I would pay a return visit. I've been waiting for 1 year, but I haven't seen the phone call from Jiuzhai Huanglong Pharmacy. Jewelry is more interesting. There are always people who say they are the boss and will say anything. You say you are from Shanghai, he speaks Shanghainese, you say you are from Shandong, and he urges the horse to change to Shandong dialect and says he is from Shandong, which is nothing more than cheating your kindness.