Hi there, I'm visiting Hong Kong on 25-30 April 2016.

Hello Heidi. It is getting warmer and warmer during that time, with the temperature ranging from 18C to 26C. Cloudy days will be the majority and you may meet several lightly rainy days. You can prepare short- and long-sleeved shirt, light jackt, jeans, and several pieces of summer attire as well as very simple rain gear in case.

Thanks for the advice, Frank! :)