Picnic Bay, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Picnic Bay, Queensland, Australia, is known for its picturesque Picnic Bay Jetty and the Magnetic Island National Park. The best time to visit Picnic Bay, Australia, is from May to September, with average air temperatures around 20-25°C (68-77°F) and water temperatures around 23-25°C (73-77°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!