Fort Riley, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Fort Riley is known for the U.S. Cavalry Museum and the historic Custer House. The best time to travel to Fort Riley is in late spring (May), when the average air temperature is around 70°F (21°C) and water temperature in nearby lakes is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!