Thanh Duc, Vietnam offers 1 beach perfect for sunbathing, surfing, swimming, and more. Thanh Duc is known for the My Lai Massacre Memorial Site. The best time to travel to Thanh Duc, Vietnam, is from November to April, with average air temperatures around 70-85°F (21-29°C) and water temperatures around 77-82°F (25-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!