Muir Beach, United States offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Muir Beach is known for the Muir Beach Overlook and the Golden Gate National Recreation Area. The best time to visit Muir Beach is from June to September, with average air temperatures around 60-70°F and water temperatures around 50-55°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!