I went to Lhasa on April 20th and wanted to know the weather in dressing index.

First, it doesn't rain this season unless you are super lucky.

Second, long-sleeved T-shirts will not be cold during the day, but will be a little cold at night. It is recommended to bring a medium-thick coat.

Third, if Namtso spends the night, the jacket will not be needed, but the vest may not be enough.

Fourth, the weather in April is fine, so I don't need a coat. I think you can only use it if you go to Mount Everest.

I hope this helps.