Thien Ai, Vietnam offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Thien Ai, Binh Thuan, Vietnam, is known for its proximity to the stunning Mui Ne sand dunes and the picturesque Fairy Stream. The best time to travel to Thien Ai, 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!