A technical harbour-city course in Yokohama with huge crowds, flat roads and a fast waterfront run.
2 km swim in Yokohama Bay off Yamashita Park, sheltered harbour water.
80 km on closed roads around Minato Mirai and the harbour district — flat and technical with many turns.
18 km flat run through the Yokohama waterfront parks and harbour promenade.
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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