San Eduardo del Mar, Argentina offers 2 beaches perfect for sunbathing, surfing, swimming, and more. San Eduardo del Mar, Buenos Aires, Argentina, is known for its proximity to the scenic beaches of the Atlantic coast and the nearby Mar del Plata. The best time to travel to San Eduardo del Mar, Argentina, is from December to February, with average air temperatures around 75°F (24°C) and water temperatures near 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!