Playa de San Antonio del Mar, Spain offers 1 beach perfect for sunbathing, surfing, swimming, and more. Playa de San Antonio del Mar is known for its proximity to the picturesque coastal landscapes of the Bay of Biscay and the charming town of Llanes. The best time to travel to Playa de San Antonio del Mar, Spain, is from June to September, with average air temperatures around 75-85°F (24-29°C) and water temperatures around 70-77°F (21-25°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!