Sardinal, Costa Rica offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Sardinal, Guanacaste, Costa Rica, is known for its proximity to the Papagayo Peninsula and the Gulf of Papagayo, which are popular for luxury resorts and beautiful beaches. The best time to travel to Sardinal, Costa Rica, is from December to April, with average air temperatures around 85°F (29°C) and water temperatures near 82°F (28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!