Steinberg, Germany offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Steinberg, Schleswig Holstein, Germany, is known for its proximity to the Geltinger Birk Nature Reserve and the Baltic Sea coastline. The best time to travel to Steinberg, Germany, is during the summer months of June to August, when the average air temperature is around 20-25°C (68-77°F) and the water temperature in nearby lakes is approximately 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!