Will be travelling to Hong Kong and Macau between May 19-23, 2018 with my preschooler son.

It can be hot and rainy in both places during that time and the average temp shall reach around 26 degrees. I suggest you prepare summer clothing, a long-sleeved shirt and rainy gear.

You may take your son to have fun at HK Disneyland and Ocean Park. In Macao, the Ruins of St. Paul's, A-ma Temple and Macao Tower are suggested.