Jupiter Island, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Jupiter Island is known for its luxurious estates and the Hobe Sound National Wildlife Refuge. The best time to travel to Jupiter Island, United States, is from November to April, with average air temperatures around 70-80°F and water temperatures around 75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!