Hai An, Vietnam offers 1 beach perfect for sunbathing, surfing, swimming, and more. Hai An, Quang Tri, Vietnam, is known for the Vinh Moc Tunnels, a historical site from the Vietnam War. The best time to travel to Hoi An, Vietnam, is from February to April, with average air temperatures around 25°C (77°F) and water temperatures near 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!