How is the weather and clothes in Hong Kong recently?

There will be cold air heading south on the evening of 25th, and the temperature will drop slightly, also around 13- 15 degrees.

You can wear a long-sleeved T-shirt, trousers, a coat that is not too thin and a scarf. If you are afraid of the cold, you can bring a sweater that is not too thick. (It's cold in the morning/night)

Supplement your question:

Zhongshan may need to wear it (there are few tall buildings, the mine is empty, and the temperature will be lower), but the weather in Hong Kong these days can't wear down jackets. It's too hot.