Is August (towards end) a good time for partying and nightlife in Hong Kong or Macau?

Actually, the weather doesn't have big differences between these two places. According to the previous records, August is a month that is easily influenced by typhoon. During this period of time, you need to reduce outdoor activities, while Lan Kwai Fong in HK is recommended for a happy nightlife. Maybe you can have parties indoor with your friends. :-)