Mariscos, Guatemala offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Mariscos, Izabal, Guatemala, is known for its proximity to the scenic Lake Izabal and the historic Castillo de San Felipe. The best time to travel to Mariscos, Guatemala, is from December to April, with average air temperatures around 75-85°F (24-29°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!