Thurmont, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Thurmont is known for Cunningham Falls State Park and Catoctin Mountain Park. The best time to travel to Thurmont, United States, is in late spring (May), when the average air temperature is around 65°F (18°C) and water temperatures in nearby lakes are typically around 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!