Merrillan, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Merrillan is known for its proximity to the scenic Black River State Forest and the Wazee Lake Recreation Area. The best time to travel to Merrillan, United States, is in late spring or early fall when the average air temperature is around 60-70°F, and water temperatures in nearby lakes are typically 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!