Thon Hai, Vietnam offers 1 beach perfect for sunbathing, surfing, swimming, and more. Thon Hai is known for its proximity to the stunning sand dunes of Mui Ne and the picturesque Ke Ga Lighthouse. The best time to travel to Thon Hai, Vietnam, is from December to April, with average air temperatures around 24-30°C (75-86°F) and water temperatures approximately 25-28°C (77-82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!