Kapowsin, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kapowsin is not particularly known for travel and beach tourism. The best time to travel to Kapowsin, United States, is during the summer months of July and August, when the average air temperature is around 75°F (24°C) and the nearby lake 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!