Hai Trach, Vietnam offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Hai Trach, Quang Binh, Vietnam, is known for Phong Nha-Ke Bang National Park. The best time to travel to Hai Trach, Vietnam, is from February to April, with average air temperatures around 24-28°C (75-82°F) and water temperatures around 25-27°C (77-81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!