Arenas del Mar, Spain offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Arenas del Mar, Canary Islands, Spain, is known for its proximity to the famous El Medano Beach and the Montaña Roja Nature Reserve. The best time to travel to Arenas del Mar, Spain, is from June to September, with average air temperatures around 75°F (24°C) and water temperatures near 72°F (22°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!