Kien Hai, Vietnam offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Kien Hai is known for Nam Du Archipelago, a stunning group of islands with pristine beaches and clear waters. The best time to travel to Kien Hai, Vietnam, is from December to April, with average air temperatures around 27°C (81°F) and water temperatures near 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!