Dien Ban, Vietnam offers 1 beach perfect for sunbathing, surfing, swimming, and more. Dien Ban is known for its proximity to the UNESCO World Heritage Site of Hoi An Ancient Town. The best time to travel to Dien Ban, Vietnam, is from February to April, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 26°C (79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!