Discover the Half Distance Triathlon in Cascais, Portugal, where athletes tackle one of the most scenic courses in the world. With its mild climate and 3,000 annual hours of sunshine, Cascais is the perfect destination for triathletes and adventurers alike. Swim: A 1.9 km (1.2 mile) loop in the protected bay of Ribeira Beach, known for clear waters and cheering crowds. October water temps: 17-19°C (62.6-66.2°F). Bike: A 90 km (56 mile) loop showcasing Guincho Beach, Sintra-Cascais Natural ...