Jamaica Beach, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Jamaica Beach is known for its proximity to Galveston Island State Park and its family-friendly beach atmosphere. The best time to travel to Jamaica Beach, United States, is from March to May, with average air temperatures around 70-80°F and water temperatures around 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!