Kapakli Koyu, Turkey offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Kapakli Koyu, Yalova, Turkey, is known for its proximity to the Termal district, famous for its thermal hot springs and the Sudusen Waterfall. The best time to travel to Kapakli Koyu, Turkey, is from June to September, when the average air temperature is around 25-30°C (77-86°F) and the water temperature is approximately 24-27°C (75-81°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!