New Milton, United Kingdom offers 2 beaches perfect for sunbathing, surfing, swimming, and more. New Milton, England, United Kingdom, is known for its proximity to the New Forest National Park and the nearby coastal attractions of Barton-on-Sea. The best time to travel to New Milton, United Kingdom, is from June to August, when the average air temperature is around 18-22°C (64-72°F) and the sea temperature is approximately 16-18°C (61-64°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!