Costa Bonita, Argentina offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Costa Bonita, Buenos Aires, Argentina, is known for its picturesque beaches and the nearby Quequen Lighthouse. The best time to travel to Costa Bonita, 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!