Urgent! ! ! I'm going to Beijing in two days. I checked the weather forecast. The temperature is about 12-24 degrees. What do I need to wear?

It is easy to catch a cold this season, and the temperature difference between morning and evening is large. Of course, pants are big. I don't know how old you are. Young people can wear a thin coat instead of long trousers. You should also wear a thicker coat. Can I take off my coat when it is hot at noon or wear it when it is cold and hot? Haha, have a good time.