Fort Lyon, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Fort Lyon, Colorado, United States, is known for the historic Fort Lyon National Cemetery and its proximity to the Santa Fe Trail. The best time to travel to Fort Lyon, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and water temperature is approximately 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!