Costa Alegre, Paraguay offers 1 beach perfect for sunbathing, surfing, swimming, and more. Costa Alegre, Cordillera, Paraguay, is known for the Ypacarai Lake and the nearby San Bernardino resort town. The best time to travel to Costa Alegre, Paraguay, is from May to September, with average air temperatures around 20-25°C (68-77°F) and water temperatures approximately 18-22°C (64-72°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!