Son Tinh, Vietnam offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Son Tinh, Quang Ngai, Vietnam, is known for the My Lai Massacre Memorial Site. The best time to travel to Son Tinh, 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!