I will travel this coming September and will celebrate mid autumn festival in HK.

It may be cloudy and shower sometimes. The temperature may vary from 75F to 85F. You may take light jackets, shirts, pants, and an umbrella.

Thank you for that information. Where in HK is the best place to celebrate Mid Autumn Festival?

As I know, the best place may be Tai Hang, Causeway Bay. The Fire Dragon Dance will be held there from 20:15 to 22:30 on September 14th and 15th, and from 20:15 to 22:00 on September 16th, 2016.

You can take MTR Island Line to Tin Hau Station, Exit A1. Cross King's Road and turn right. Walk straight to the second junction on the left to enter Tung Lo Wan Road, which leads to the Tai Hang area :)