Isla Grande, Colombia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Isla Grande is known for its stunning coral reefs and the Oceanario Islas del Rosario. The best time to travel to Isla Grande, Colombia, is from December to March, with average air temperatures around 86°F (30°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!