Isakoy, Turkey offers 1 beach perfect for sunbathing, surfing, swimming, and more. Isakoy, Kastamonu, Turkey, is known for its proximity to the Ilgaz Mountain National Park and the historical Kastamonu Castle. The best time to travel to Isakoy, Turkey, is from May to September, with average air temperatures ranging from 20°C to 30°C and water temperatures around 20°C to 25°C. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!