Lying in the tropical zone and consisting mainly of water, Halong Bay enjoys a warm and wet climate with two distinctive seasons: hot and damp summer versus dry and cool winter. The average temperature of Halong hovers around 15-25 Celsius degree with the hottest months being June – August. However, the heat is significantly reduced thanks to the cool breeze, which seems to exist permanently in this sea island area. In winter it can get quite cold, especially if you are not from temperate zone such as North America or Europe. Always bring sunscreen and hat for summer trips and light coat or jacket for winter ones (read our Packing tips for Halong Bay).Best time to visit
When is the best time to visit Halong Bay really depends on your own definition of a perfect trip.
If you are most concerned about weather, then the periods September; November and March; May are ideal for a trip to Halong Bay. The dry climate and pleasant temperature will enable you to enjoy all activities offered on board while making sightseeing as perfect as it could be.
If you are a budget minded travelers, then schedule your trip between May and September. This is often considered the low season and many cruise ships offer massive sale off on cabin: you can save as much as 40% on a cruise trip compared with other time in a year.;However, the months of July; August often see sporadic hurricanes and storms, which may render cancellation and delay of your trip. In those cases, you can switch around by visiting another destination in the North of Vietnam and visit Halong Bay later. These storms will not last longer than 3-4 days
If you do not have the option of time, then be rest assured that you will enjoy your trip as much as when you do no in another month or day of the year. The Bay is filled with sunlight and rain usually does not last long. In warmer season you can take advantage of swimming opportunity and in cooler season you will enjoy Halong Bay like no-one else: imagine a steamy BBQ lunch by the caves in one of the most gorgeous natural complex of the world; it's all about experience.