There's nothing like an all-inclusive holiday in Nha Trang to rejuvenate you, especially when you know what to expect from the elements. Here's some information to help you decide when to book: The hottest months are usually June and May, with an average temperature of 28°C, while the coldest months are January and February, with an average of 24°C. February and March are the driest months, while November and October are the rainiest months.