Nyborg, Denmark offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Nyborg is known for Nyborg Castle, one of the oldest royal castles in Denmark. The best time to travel to Nyborg, Denmark, is from June to August, when the average air temperature is around 18°C (64°F) and the water temperature is approximately 17°C (63°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!