Rattvik, Sweden offers 1 beach perfect for sunbathing, surfing, swimming, and more. Rattvik is known for its annual music festival Musik vid Siljan and the scenic Lake Siljan. The best time to travel to Rattvik, Sweden, is during the summer months of June to August, when the average air temperature is around 15-20°C (59-68°F) and the water temperature in nearby lakes is approximately 15-18°C (59-64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!