Belfast, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Belfast is known for its charming coastal scenery and vibrant arts scene. The best time to travel to Belfast, United States, is during the summer months of June to August, when the average air temperature ranges from 60°F to 75°F (15°C to 24°C) and the water temperature is around 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!