Cong Hai, Vietnam offers 1 beach perfect for sunbathing, surfing, swimming, and more. Caldwell, Idaho, United States, is known for the Indian Creek Plaza and the College of Idaho. The best time to travel to Cong 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!