Thach Hai, Vietnam offers 1 beach perfect for sunbathing, surfing, swimming, and more. Thach Hai is known for its serene beaches and traditional Vietnamese coastal culture. The best time to travel to Thach Hai, Vietnam, is from February to April, with average air temperatures around 25-30°C (77-86°F) and water temperatures approximately 24-28°C (75-82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!