Cai Chien, Vietnam offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Cai Chien is known for its pristine beaches and the Cai Chien Island in Quang Ninh, Vietnam. The best time to travel to Cai Chien, Vietnam, is from October to April, with average air temperatures around 20-25°C (68-77°F) and water temperatures around 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!