What should I wear to Tibet in late May? How's the weather?

Hello, I'm Master Jiang, a chartered tourist from Northwest China. In May, the temperature in Tibet slowly rose. Because of the high altitude, it is different from other places, so although the temperature has risen, I still have to bring some thick clothes, some colorful clothes or scarves in my clothes. The photos taken are effective, so I need to take or prepare some medicines to prevent altitude in advance, and I also need to prepare some daily cold medicines and gastrointestinal medicines. It is also very important that tickets for Potala Palace are limited now, so buy tickets for Potala Palace in advance to avoid delaying the trip.

I hope it will help you a little!