Discovery Bay, Jamaica offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Discovery Bay is known for Puerto Seco Beach and the Green Grotto Caves. The best time to travel to Discovery Bay, Jamaica, is from December to April, with average air temperatures around 77-86°F (25-30°C) and water temperatures near 81°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!