What's the weather like in Tangshan on May 1 Day?

The basic temperature is about 13-27 degrees. The temperature is high at noon, I feel a little hot, and it gets cold at night. But the coastal city of Tangshan won't be very hot.

You can visit other places, which is suitable for leisure. Because all the places you mentioned are near the sea, it is recommended to take a thin long-sleeved coat to avoid the cold sea breeze.