Lake Arrowhead, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Lake Arrowhead is known for its picturesque mountain lake setting and outdoor recreational activities. The best time to travel to Lake Arrowhead, United States, is during the summer months of June to August, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!