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Triathlons in UK in September 2025

Find triathlons near me in UK 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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  • 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
  • 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
  • Sun 21 Sep
Henley-on-Thames, Buckinghamshire, UK

The One on the River | Henley | Middle Distance Triathlon

  • 1900 m river swimming
  • 78.5 km road cycling
  • 20 km trail running
  • Sun 21 Sep
Henley-on-Thames, Buckinghamshire, UK

The One on the River | Henley | Standard Triathlon

  • 1500 m river swimming
  • 54 km road cycling
  • 10 km 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
Sudbury, Suffolk, UK

Sudbury Triathlon | Sprint Triathlon

  • 400 m pool swimming
  • 23 km road cycling
  • 5 km trail running
  • 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
  • Sun 21 Sep
Bungay, Suffolk, UK

Autumn Waveney

  • 400 m pool swimming
  • 20 km road cycling
  • 3.2 km road running
  • Sun 21 Sep
Henley-on-Thames, Buckinghamshire, UK

The One on the River | Henley | Sprint Triathlon

  • 750 m river swimming
  • 30 km road cycling
  • 5 km trail running
  • Sun 21 Sep
Aldeburgh, Suffolk, UK

Aldeburgh Fun Team Relay Triathlon

  • 750 m sea swimming
  • 22 km road cycling
  • 5 km trail running
  • Sun 28 Sep
Stratford-upon-Avon, Warwickshire, UK

Warwickshire Triathlon | Sprint and Relay

  • 400 m pool swimming
  • 18 km road cycling
  • 5 km road running
  • Sun 28 Sep
Stratford-upon-Avon, Warwickshire, UK

Warwickshire Triathlon | Fun

  • 200 m pool swimming
  • 18 km road cycling
  • 2.5 km road running
  • Sun 28 Sep
Stratford-upon-Avon, Warwickshire, UK

Warwickshire Triathlon | CRUK Wave & Relay

  • 200 m pool swimming
  • 18 km road cycling
  • 2.5 km road running
  • Sun 28 Sep
Stratford-upon-Avon, Warwickshire, UK

Warwickshire Triathlon | Super Sprint

  • 200 m pool swimming
  • 18 km road cycling
  • 2.5 km road running

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