Chatham, United States offers 25 beaches perfect for sunbathing, surfing, swimming, and more. Chatham is known for the Chatham Lighthouse, Monomoy National Wildlife Refuge, and the Chatham Fish Pier. The best time to travel to Chatham, United States, is during the summer months of June to August, when the average air temperature is around 70-75°F and the water temperature is approximately 65-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!