Depending on when you visit Ho Chi Minh City, you can experience either tropical wet conditions or a relatively dry climate. The year is divided into two distinct seasons, the rainy season essentially lasts around 7 months from the month of May to November. The rest of the year is nice and dry.
If the heat ever gets to you, there are plenty of water parks to help you cool down. This season is the best for people who love the outdoors as well as like to stay dry.