Bang Kachai, Thailand offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Bang Kachai, Chanthaburi, Thailand, is known for its gem markets and the Chanthaburi Gem and Jewelry Center. The best time to travel to Bang Kachai, Thailand, is from November to February, with average air temperatures around 25-30°C (77-86°F) and water temperatures near 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!