Montesano, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Montesano is not particularly known for travel and beach tourism. The best time to travel to Montesano, United States, is during the summer months of June to August, when the average air temperature ranges from 55°F to 75°F (13°C to 24°C), and the nearby water temperatures are typically around 50°F to 60°F (10°C to 16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!