I am travelling to Zhuhai in beginning of December. Can anyone advise email what to wear?

Dear Sam. It won't be that cold. I just checked that the lowest temp can be 18C and the highest 25C. So it may be a little cool in the early morning. Fine and rainy days will happen, so hope you are lucky enough with the sunny days. Wear long-sleeved shirt, coat and thick pants, and prepare an umbrella in case.