Arenys de Mar, Spain offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Arenys de Mar is known for its beautiful beaches and historic shipyards. The best time to travel to Arenys de Mar, Spain, is from June to September, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 73°F (23°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!