I'm going to Dalian Lushun on April 22nd. What clothes should I wear and what clothes should I bring? How's the weather?

The weather is fine. If you are afraid of the cold, you'd better wear underpants and shirts inside and light clothes outside, but it will still be hot outside around noon. If you are not afraid of the cold, you can just wear light clothes and add a coat outside, but it is warmer outside now, and it will be cold if you stay indoors for a while. If you are indoors, you should also keep warm.