Haiphong, Vietnam offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Haiphong, Hai Phong, Vietnam, is known for Cat Ba Island and the Do Son Beach. The best time to travel to Haiphong, Vietnam, is from October to April, with average air temperatures around 20-25°C (68-77°F) and water temperatures around 23-26°C (73-79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!