Is it cold in Qingdao on May Day? Can I wear short sleeves?

Qingdao is not cold in May 1 day, but the temperature difference between morning and evening is large. It's okay to wear short sleeves in the sun or around noon. It's still a little cold in the morning, and I need long-sleeved shirts. In addition, the temperature difference between inside and outside the house is a bit large. If it is an outdoor activity, short sleeves are definitely more comfortable. You'll need long sleeves when you go back to the house. It's a little cold.