What is the weather in Macau in December from 18 to 21 ?what kind of clothing to carry?

By reading the records of the past years, it shall be a little cool during that time. The lowest temp drops to 10C and the highest may reach around 20C. Cloudy days would take up the majority and some rainy days may happen. It is suggested to prepare sweater, coat and jeans as well as simple rain gear.

you should bring a few jackets, long sleeve shirts (and a few short sleeves just in case) and trousers (unless you can handle the cold well you can bring shorts) and you should be good! ^^ (it's not really that cold in Macau)