Cybi Coastal 25K (Half Cybi)
Race Day Weather
Comfortable temps, moderate wind, chance of rain
Mild 59°F temps at gun time mean comfortable early miles without overheating risk. Moderate winds around 13mph may affect pacing on open sections of the course. There's a chance of rain, so have a backup gear plan ready. High humidity (82%) will make it harder to cool down through sweat — increase fluid intake accordingly.
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Race Info
The Half Cybi 25K starts and finishes at the RNLI lifeboat station on Newry Beach in Holyhead. It shares the marathon's first section toward Penrhos, then cuts across to Trearddur Bay instead of taking the marathon's longer coastal loop. The route follows the Anglesey Coastal Path over cliff paths, tracks and sand, with an undulating profile and a final climb over Mynydd Twr (Holyhead Mountain) before the finish back at the lifeboat station.
