Middlesex, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Middlesex, Vermont, United States, is known for its proximity to the scenic Green Mountains and the popular Hunger Mountain Co-op. The best time to travel to Middlesex, United States, is in late spring (May to June) when the average air temperature is around 60-75°F and water temperature is approximately 55-65°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!