Johnson Lake, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Johnson Lake is known for Johnson Lake State Recreation Area, which offers fishing, boating, and camping opportunities. The best time to travel to Johnson Lake, United States, is during the summer months of June to August, when the average air temperature is around 80°F (27°C) and the water temperature is approximately 75°F (24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!