Islas del Rosario, Colombia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Islas del Rosario is known for its stunning coral reefs and the Oceanario Islas del Rosario. The best time to visit Islas del Rosario, Colombia, is from December to March, 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!