Kumaka, Guyana offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Kumaka, Barima Waini, Guyana, is known for its proximity to the Shell Beach, a unique coastal area famous for its nesting sea turtles. The best time to travel to Kumaka, Guyana, is from late August to early November, with average air temperatures around 27°C (81°F) and water temperatures near 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!