Widely rated the toughest and best-supported IRONMAN in Europe — savage terrain and unforgettable crowds.
Two-lap sea swim in Tenby's North Beach, often with real Atlantic swell, followed by the famous zig-zag run up to transition.
Brutally hard Pembrokeshire loops: relentless short steep climbs, narrow hedge-lined lanes and exposed coastal wind.
Four-lap run with the punishing climb up St John's Hill every lap, finishing through Tenby's packed streets.
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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