Hoi Phong, Vietnam offers 1 beach perfect for sunbathing, surfing, swimming, and more. Hoi Phong, Ha Tinh, Vietnam, is known for Ke Go Lake and the Ke Go Nature Reserve. The best time to travel to Hai Phong, Vietnam, is from October to April, with average air temperatures ranging from 18°C to 25°C and water temperatures around 23°C to 27°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!