Schonberg, Germany offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Schonberg, Schleswig Holstein, Germany, is known for the Schonberger Strand, a popular beach destination on the Baltic Sea. The best time to travel to Schonberg, Germany, is during the summer months of June to August, when the average air temperature is around 20°C (68°F) and the Baltic Sea 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!