What is likely weather for end of May to mid June for Beijing, Yantail, Shanghi areas

I think you may mean BJ, Yantai in Shangdong and Shanghai, right?
The average temperature for BJ in May is around 17 to 27C and it will become higher in the rest of time.
For Yantai, it is around 17 to 26C and it will raise in the later time.
For Shanghai, it is around 20 to 24C.