Saint Thomas, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Saint Thomas, Nevada, United States, is known for being a ghost town submerged by Lake Mead and later re-emerging as a historical site. The best time to travel to Saint Thomas, United States, is from April to June, with average air temperatures around 80-85°F (27-29°C) and water temperatures about 79-82°F (26-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!