Hoai Hai, Vietnam offers 1 beach perfect for sunbathing, surfing, swimming, and more. Hoai Hai, Binh Dinh, Vietnam, is known for its beautiful beaches and the nearby Ky Co and Eo Gio tourist attractions. The best time to travel to Hoai Hai, Vietnam, is from February to April, with average air temperatures around 25-30°C (77-86°F) and water temperatures approximately 26-28°C (79-82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!