Half Distance Triathlon Weymouth, Dorset, England – A Scenic Challenge for Triathletes Kick off your journey with a 1.2-mile (1.9 km) swim in the calm waters of Weymouth Bay. The one-loop triangular course involves swimming straight out from Weymouth's picturesque beach, making two right turns, and heading back to the transition area. With an average water temperature of 63°F (17°C), the conditions are ideal for a strong start. The 56-mile (90 km) bike route features one anti-clockwise loop ...