Thanh Hai, Vietnam offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Thanh Hai, Ben Tre, Vietnam, is known for its proximity to the Mekong Delta and the famous coconut groves. The best time to travel to Thanh Hai, Vietnam, is from December 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!