Villa Mercedes, Argentina offers 1 beach perfect for sunbathing, surfing, swimming, and more. Villa Mercedes is known for La Pedrera Park, a major attraction in San Luis, Argentina. The best time to travel to Villa Mercedes, Argentina, is during the spring months of October and November, when the average air temperature is around 20°C (68°F) and water temperature is approximately 18°C (64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!