Will it be cold to play in Xingcheng on May Day? How's the weather?

The temperature difference between downtown and seaside is 3 degrees. When the weather is fine, you can wear early summer clothes in the city, but you need to wear long-sleeved clothes at the seaside. Because there will be sea breeze at the seaside, it is necessary to add an extra coat in bad weather. Sea breeze is easy to blow this season. If it is convenient, you'd better take an extra coat.