Agnes Water, Australia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Agnes Water is known for its proximity to the Southern Great Barrier Reef and the Town of 1770. The best time to travel to Agnes Water, Australia, is from May to October, with average air temperatures around 20-25°C (68-77°F) and water temperatures around 22-24°C (72-75°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!