Kvarnholmen, Sweden offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kvarnholmen is known for its historical Kalmar Castle and the Kalmar Cathedral. The best time to travel to Kvarnholmen, Sweden, 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 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!