Biddeford, United States offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Peter Island is known for the luxurious Peter Island Resort & Spa. The best time to travel to Biddeford, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and the water temperature is approximately 60-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!