Kalmar, Sweden offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Kalmar is known for the Kalmar Castle and its historical significance in Swedish history. The best time to travel to Kalmar, 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!