This depends on when you take the hike. Summer is quite hot in Vietnam (May to September). October and April are warm and dry. It’s freezing in the winter (November – March). It is recommended that you bring plenty of layers which you can take off / put on as the temperature changes. Trousers (pants) that zip off at knee level are ideal and t-shirts, long-sleeved shirt and a warm fleece are also recommended. Click here for more information about Vietnam weather.