Zonguldak, Turkey offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Zonguldak, Zonguldak is known for the Filyos Ancient City and the Cehennemagzi Caves. The best time to travel to Zonguldak, Turkey, is from June to September, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 22°C (72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!