Lake Arthur, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Lake Arthur is known for its scenic lakefront and recreational water activities. The best time to travel to Lake Arthur, United States, is during the summer months of June to August, when the average air temperature is around 85°F (29°C) and the water temperature is approximately 80°F (27°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!