Portsmouth, Dominica offers 21 beaches perfect for sunbathing, surfing, swimming, and more. Portsmouth is known for its proximity to the Cabrits National Park and the Indian River, offering rich natural and historical attractions. The best time to travel to Portsmouth, Dominica, is from December to April, with average air temperatures around 77-86°F (25-30°C) and water temperatures about 79-82°F (26-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!