I want to travel to Rizhao on May Day. I want to know what clothes are suitable for the local area and what is the temperature?

General spring and autumn coats will do. Need long sleeves. It's cool in the sun in the morning and evening, and it's ok to soak barefoot in the sea. We're going to Tomb-Sweeping Day. It's a little cold. We can't go barefoot. We made an appointment with the fisherman's proprietress to wash seaweed when the weather is warmer, and go to O(∩_∩)O to recommend local accommodation: Rizhao Senyuan Fisherman. The proprietress is very enthusiastic and has arrived.