Kattegat, Sweden offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kattegat, Smaland, Sweden, is known for its picturesque coastal landscapes and proximity to the fictional setting of the TV series "Vikings." The best time to travel to Kattegat, 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!