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Triathlons in Wales in September 2025

Find triathlons near me in Wales in September 2025 - filter by date or location, display on a map or use the advanced search to find your perfect race.

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  • Sun 7 Sep
Bala, Gwynedd, UK

Rawson Group Triathlon Y Bala | Sprint Triathlon

  • 750 m lake swimming
  • 20 km road cycling + 587 ft ascent
  • 5 km road running + 160 ft ascent
  • Sun 7 Sep
Bala, Gwynedd, UK

Rawson Group Triathlon Y Bala | Standard Triathlon

  • 1500 km lake swimming
  • 37 km road cycling + 1181 ft ascent
  • 10 km road running + 255 ft ascent
  • Sat 20 Sep
Caernarfon, Gwynedd, UK

The Brutal Extreme Triathlon | The Brutal Bach Standard

  • 0.6 mile lake swimming
  • 28.99 miles road cycling
  • 9.5 miles trail running
  • Sat 20 Sep
Caernarfon, Gwynedd, UK

The Brutal Extreme Triathlon | The Brutal Canol Half

  • 1.2 miles lake swimming
  • 57.98 miles road cycling
  • 14.7 miles trail running
  • Sat 20 Sep
Caernarfon, Gwynedd, UK

The Brutal Extreme Triathlon | The Brutal Mawr Full

  • 2.4 miles lake swimming
  • 115.96 miles road cycling
  • 25.1 miles trail running
  • Sat 20 Sep
Caernarfon, Gwynedd, UK

The Brutal Extreme Triathlon | The Brutal Cawr Double

  • 4.8 miles lake swimming
  • 231.92 miles road cycling
  • 51.1 miles trail running
  • Sun 21 Sep
Llanfairpwllgwyngyll, Isle of Anglesey, UK

Superfeet Sandman Triathlon and Duathlon | Legend (70.3) Triathlon

  • 1900 m sea swimming
  • 93 km road cycling + 3175 ft ascent
  • 19.8 km multi terrain running + 570 ft ascent
  • Sun 21 Sep
Llanfairpwllgwyngyll, Isle of Anglesey, UK

Superfeet Sandman Triathlon and Duathlon | Sprint Triathlon

  • 750 m sea swimming
  • 22.9 km road cycling + 610 ft ascent
  • 5.4 km multi terrain running + 144 ft ascent
  • Sun 21 Sep
Llanfairpwllgwyngyll, Isle of Anglesey, UK

Superfeet Sandman Triathlon and Duathlon | Standard Triathlon

  • 1500 m sea swimming
  • 42.3 km road cycling + 1154 ft ascent
  • 9.9 km multi terrain running + 282 ft ascent

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