Information on weather of Nanjing.

Well, the temperature will have a big difference between day and night at that time, ranging from 3~17C. It is cool and pleasant during the day and you can wear long-sleeved shirts with jacket, while it is cold at night. You need to wear sweater and overcoat if go outside at night. It may also have rainfall during that period. You'd better pack an umbrella or raincoat.