Tropical heat and humidity are the defining challenge here; the course itself is flat and quick on closed city roads.
2 km swim in the sheltered water off Sentosa/Marina, warm year-round.
80 km on closed expressways and coastal roads — flat and fast with a handful of ramps and tunnels.
18 km flat run through the waterfront and marina precinct in high humidity.
Actual monthly averages from the last 3 years (Open-Meteo). Real race day may vary.
Water temp uses athlete-reported values first, then official race data, then the marine archive (sea swims, measured at the nearest offshore point). Values tagged est. are modelled from recent air temperature for lakes and rivers, where no observational data exists.
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