Buyukdere, Turkey offers 1 beach perfect for sunbathing, surfing, swimming, and more. Buyukdere, Istanbul, Turkey, is known for its proximity to the Bosphorus and the historic Sadberk Hanim Museum. The best time to travel to Buyukdere, Turkey, is from May to September, with average air temperatures around 20-30°C (68-86°F) and water temperatures ranging from 20-25°C (68-77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!