Grube, Germany offers 1 beach perfect for sunbathing, surfing, swimming, and more. Grube, Schleswig Holstein, Germany, is known for its proximity to the Baltic Sea and the scenic Holstein Switzerland Nature Park. The best time to travel to Grube, Germany, is during the summer months of June to August, when the average air temperature is around 20°C (68°F) and the water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!