Arnarstapi, Iceland offers 1 beach perfect for sunbathing, surfing, swimming, and more. Arnarstapi is known for its stunning coastal cliffs and the iconic Gatklettur rock arch. The best time to visit Arnarstapi, Iceland, is from June to August, when the average air temperature is around 10-15°C (50-59°F) and the sea temperature is approximately 8-11°C (46-52°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!