The pinnacle of long-course triathlon. Heat, humidity, and Mumuku winds separate this course from every other Ironman.
Single-loop swim in Kailua Bay. Warm, salty, clear water with strong sun exposure.
Out-and-back on Queen Ka'ahumanu Highway to Hawi. Rolling lava fields, crosswinds are the defining feature.
Ali'i Drive out-and-back into the Energy Lab. Flat but brutally hot with radiant heat off the pavement.
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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