Southgate, United Kingdom offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Dewey Beach is known for its vibrant nightlife and the annual music festival, Dewey Beach Music Conference. The best time to travel to Southgate, United Kingdom, is late spring to early summer (May to June) when the average air temperature is around 15-20°C (59-68°F) and water temperature is approximately 12-15°C (54-59°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!