Saint John's, Antigua and Barbuda offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Saint John's, Antigua and Barbuda, is known for Nelson's Dockyard, a UNESCO World Heritage site. The best time to travel to Saint John's, Antigua and Barbuda, is from December to April, with average air temperatures around 77-82°F (25-28°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!