Half Distance Triathlon Weymouth, Dorset, England: Race Day Breakdown The 1.2-mile (1.9 km) swim in Weymouth Bay offers a picturesque, one-loop triangular course. Swimmers start from Weymouth's sandy beach, heading straight out to sea before making two right turns and returning to the transition area. Expect calm waters with an average temperature of 63°F (17°C), ideal for wetsuit usage. This 56-mile (90 km) ride showcases the stunning Dorset countryside. The single, anti-clockwise loop takes ...