Going to Beijing 16-19may then xian 19-23may and shanghi 23-26 what weather can we expect?

It’s sunny in BJ but a little hot, and the temperature ranges from 20-35C.
In Xian, it may be rainy and the temperature is lower, about 15-30C.
In Shanghai, it may also be rainy or cloudy, and the temperature is from 20-30C.
Btw, you’d better take t-shirts, shirts and thin jacket.