Portland Cottage, Jamaica offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Portland Cottage, Clarendon, Jamaica, is known for its proximity to the Portland Bight Protected Area and the Goat Islands. The best time to travel to Portland Cottage, Jamaica, is from December to April, when the average air temperature is around 80°F (27°C) and the water temperature is approximately 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!