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April and October are the best for me...I was also there during August and it is a bit too hot. Air conditioning is slightly on the extreme side when you go shopping or when you use taxis :)

I would love to visit HK. Thanks for sharing the best time to book and for the tips. I will bear this in mind too! Perhaps I'll be spending my summer this April in HK. :D

summer in HK's April sounds good...hopefully I will be there too in April '19