What clothes do I need to wear to go to Luoyang, Henan Province on May Day?

5 1 Luoyang is hot. If you are traveling, it will be even hotter if you wander outside all day, so a short T-shirt will do, and you can bring a long-sleeved shirt. If it is hot, you can just wear it and roll up your sleeves. If it rains and it gets cold, you can take it outside.

I suggest you check the weather forecast before you go. Generally, you can see the weather 3-4 days in advance.