When is the best time to book Bai Tu Long bay cruises & tours, travelers should know before having a decision to book tours? Bai Tu Long Bay is worth visiting the whole year-round for its different beauty in every single season. There are four seasons in Bai Tu Long: the wet and hot summer, the cool autumn, the cold and dry winter, and the warm spring. The average annual temperature of Bai Tu Long is around 15°C to 25°C. Should you give us your travel schedule, we will give you the best travel consultancy for Bai Tu Long bay Cruise & Tours. Email: baitulongbay@impresstravel.com & call to Mr. Alex Impress Travel, Halong Tours, Bai Tu Long Bay Cruises cell-phone (+84) 9123 79 189