Cocoli, Guatemala offers 1 beach perfect for sunbathing, surfing, swimming, and more. Cocoli, Izabal, Guatemala, is known for its proximity to the Rio Dulce and the Castillo de San Felipe. The best time to travel to Cocoli, Guatemala, is from November to April, with average air temperatures around 75°F (24°C) and water temperatures near 80°F (27°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!