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Triathlons in UK in September 2025

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

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Click an event for full event details, location, route, sustainability, what's included and how to enter.

Taking THE ROC into the Lake District, this is an opportunity to test your resolve and focus in one of the most inspiring locations in Europe. Face up to the mountain.
  • Sat 6 Sep
  • £240-£260
  • Sat 6 Sep
  • £240-£260
Ulverston, Cumbria, UK

THE ROC ENGLAND

Taking THE ROC into the Lake District, this is an opportunity to test your resolve and focus in one of the most inspiring locations in Europe. Face up to the mountain.

  • Recycling
  • Plastic bottle free
  • Music
  • Chip timing
  • Enter online
  • Mountainous
  • Event village
  • Rural
  • Mountains
  • Sustainability policy
  • Plastic-free event
  • Age 18 & over
  • 1.5 km lake swimming
  • 92 km road cycling
  • 18.5 km multi terrain running
Get involved in this Grafham Triathlon, brought to you by the largest triathlon organiser in the UK!
  • Sat 13 Sep
  • £73-£115
  • Sat 13 Sep
  • £73-£115
Huntingdon, Cambridgeshire, UK

ATW Grafham Triathlon

Get involved in this Grafham Triathlon, brought to you by the largest triathlon organiser in the UK!

  • Recycling
  • Newcomers
  • Event village
  • Park
  • Sustainability policy
  • Age 15 & over
  • Sprint triathlon
  • Olympic triathlon
  • Standard aquabike
Join Aviemore Triathlon in the beautiful Cairngorms and enjoy an open water swim in the cool, calm waters of Loch Morlich and enjoy mountain biking and running on the trails of Glenmore Forest.
  • Sun 14 Sep
  • £73-£98
  • Sun 14 Sep
  • £73-£98
Aviemore, Highland, UK

Aviemore Triathlon

Join Aviemore Triathlon in the beautiful Cairngorms and enjoy an open water swim in the cool, calm waters of Loch Morlich and enjoy mountain biking and running on the trails of Glenmore Forest.

  • Recycling
  • Newcomers
  • Event village
  • Sustainability policy
  • Age 15 & over
  • Sprint triathlon
  • Olympic triathlon
Situated off the World Heritage Site Jurassic Coast, this race is a first-timer favourite, featuring sandy beaches, spectacular coastline and the stunning Dorset countryside.
  • Sun 14 Sep
  • Sun 14 Sep
Weymouth, Dorset, UK

IRONMAN 70.3 Weymouth

Situated off the World Heritage Site Jurassic Coast, this race is a first-timer favourite, featuring sandy beaches, spectacular coastline and the stunning Dorset countryside.

  • Enter online
  • Traffic free
  • Event village
  • Coast
  • Age 18 & over
  • 1.2 miles sea swimming
  • 56 miles road cycling
  • 13.1 miles road running
Triathlons at Dawlish Warren, a safe and supported environment for sea swimming, with a range of triathlon distances to offer a great challenge in a scenic location.
  • Sun 21 Sep
  • £45-£56
  • Sun 21 Sep
  • £45-£56
Dawlish, Devon, UK

Dawlish Triathlon

Triathlons at Dawlish Warren, a safe and supported environment for sea swimming, with a range of triathlon distances to offer a great challenge in a scenic location.

  • Families
  • Trees not tees
  • Newcomers
  • Coast
  • Sustainability policy
  • Plastic-free event
  • Age 15 & over
  • Super sprint triathlon
  • Sprint triathlon
The Olympic venue, Eton Dorney, offers pan-flat, traffic-free roads and a beautiful clear lake for all levels of triathletes and swimmers to enjoy in an exclusive setting.
  • Sun 21 Sep
  • £30-£97
  • Sun 21 Sep
  • £30-£97
Windsor, Buckinghamshire, UK

Eton Dorney Triathlon & Swims

The Olympic venue, Eton Dorney, offers pan-flat, traffic-free roads and a beautiful clear lake for all levels of triathletes and swimmers to enjoy in an exclusive setting.

  • Families
  • Recycling
  • Newcomers
  • Dogs allowed
  • Event village
  • Urban
  • Park
  • Rural
  • Free venue entry
  • Age 15 & over
  • Super sprint triathlon
  • Sprint triathlon
  • Olympic triathlon
  • Lake swim 4
The Big East and Maldon Triathlon is brought to you by the largest triathlon organiser in the UK! A great experience featuring a tidal river swim.
  • Sun 21 Sep
  • £73-£175
  • Sun 21 Sep
  • £73-£175
Maldon, Essex, UK

ATW Big East & Maldon Triathlon

The Big East and Maldon Triathlon is brought to you by the largest triathlon organiser in the UK! A great experience featuring a tidal river swim.

  • Newcomers
  • Event village
  • Park
  • Age 15 & over
  • Sprint triathlon
  • Olympic triathlon
  • Standard aquabike
  • Half Ironman
  • Middle aquabike
Take on a multi-activity or distance event and take the opportunity to race around this unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.
  • Sat 27 Sep
  • £58-£120
  • Sat 27 Sep
  • £58-£120
Windsor, Buckinghamshire, UK

Dorney Triathlon | September

Take on a multi-activity or distance event and take the opportunity to race around this unique and inspiring Olympic venue! Great water quality and flat, scenic grounds.

  • Recycling
  • Newcomers
  • Event village
  • Sustainability policy
  • Age 15 & over
  • Super sprint triathlon
  • Sprint triathlon
  • Olympic triathlon
  • Sprint aquabike
  • Standard aquabike
Taking place from the wonderful North Sands, put your endurance to the test with a sociable and challenging seaside triathlon, to finish with a Salcombe Sprint Triathlon medal!
  • Sun 28 Sep
  • £65
  • Sun 28 Sep
  • £65
Salcombe, Devon, UK

Salcombe Brewery Co Sprint Triathlon

Taking place from the wonderful North Sands, put your endurance to the test with a sociable and challenging seaside triathlon, to finish with a Salcombe Sprint Triathlon medal!

  • Newcomers
  • Enter online
  • Event village
  • Coast
  • Fundraising optional
  • Age 18 & over
  • 700 m sea swimming
  • 19 km road cycling
  • 3 km trail running
  • Sun 7 Sep
Penrith, Cumbria, UK

Helvellyn Triathlon & Aquabike

  • Olympic triathlon
  • Standard aquabike
  • Wed 10 Sep
Cromhall, Gloucestershire, UK

South West Maritime Triathlon Series - Race 5

  • Sprint triathlon
  • Sprint duathlon
  • Sun 14 Sep
Nantwich, Cheshire, UK

North West Triathlon

  • Novice triathlon 2
  • Super sprint triathlon
  • Sprint triathlon
  • Sun 28 Sep
Stratford-upon-Avon, Warwickshire, UK

Warwickshire Triathlon

  • Novice triathlon 2
  • Super sprint triathlon
  • Sprint triathlon

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