Algonquin, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Algonquin, Maryland, United States, is known for the Chesapeake Bay Maritime Museum. The best time to travel to Algonquin, United States, is in late spring or early fall when the average air temperature is around 60-70°F and water temperature is approximately 50-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!