Monterrico, Guatemala offers 1 beach perfect for sunbathing, surfing, swimming, and more. Monterrico is known for its black sand beaches and the Monterrico-Hawaii Natural Reserve. The best time to visit Monterrico, Guatemala, is from November 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!