Priestmans River, Jamaica offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Priestmans River, Portland, Jamaica, is known for its proximity to the Blue Lagoon and Reach Falls. The best time to travel to Priestmans River, Jamaica, is from December to April, with average air temperatures around 80°F (27°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!