Alta, Sweden offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Alta, Stockholms lan, Sweden, is known for the Stockholm Archipelago and its proximity to the vibrant cultural attractions of Stockholm. The best time to travel to Alta, Sweden, is from June to August, when the average air temperature is around 12-15°C (54-59°F) and the water temperature is approximately 8-12°C (46-54°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!