Port Erin, Isle of Man offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Port Erin, Isle Of Man, is known for its picturesque Port Erin Beach and the historic Bradda Head and Milner's Tower. The best time to travel to Port Erin, Isle of Man, is from June to August, when the average air temperature is around 15-18°C (59-64°F) and the water temperature is approximately 14-16°C (57-61°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!