When traveling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in Da Nang is roughly less than Detroit Metropolitan Wayne County. You can assume this to be the case over the next 6 days.
You can imagine temperatures to be in the 35 °C range in June. The weather in Detroit Metropolitan Wayne County is generally colder than Da Nang's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.