Saint Helier, Jersey offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Saint Helier is known for Elizabeth Castle, the Jersey Museum, and the Central Market. The best time to travel to Saint Helier, Jersey, is from June to September, with average air temperatures around 60-70°F (15-21°C) and water temperatures around 59-64°F (15-18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!