When is the London Triathlon 2026?

The next edition of the London Triathlon is on July 2, 2026. The race is typically held in July each year.

What is the water temperature at London Triathlon and can I wear a wetsuit?

The swim takes place in lake water with an average temperature of 17°C during race month. Wetsuits are conditional — typically depends on race-day water temperature.

How hilly is the London Triathlon bike course?

The 40km bike course has 100m of elevation gain and is classified as flat. The course is out and-back on road surface. Drafting is not allowed.

What is the weather like on race day at London Triathlon?

Expect temperatures between 12°C and 23°C (average 20°C) with 60% humidity. There is a 19% chance of rain and average wind speeds of 15 km/h. Typical: 20°C, 60% humidity.

How big is the London Triathlon and when was it first held?

The London Triathlon was established in 1998 (28 years ago) and has approximately 5,411 finishers per edition. Athletes from 63 countries compete.

What is the average finish time for London Triathlon?

The average finish time is approximately 2 hours and 18 minutes. This can vary based on weather conditions, course difficulty, and athlete experience level.

What are the swim conditions like at London Triathlon?

The 1500m swim is in lake water with calm conditions. The format is open-water. Lake swim in London.

London Triathlon — Guide, Training Plan & Tips

Average Finish Time 02:18:00

Total Finishers 5 411

Temperature 20°C

Water Temperature 17°C

Bike Elevation ↑100m

Established 1998

"Lake swim and rolling countryside bike in London, United Kingdom."

🏊 Swim

Distance 1500m

Water lake (open-water)

Water Temp 17°C

Wetsuit conditional

Avg Split 00:19:00

Lake swim in London.

🚴 Bike

Distance 40km

Elevation ↑100m

Profile flat

Drafting Non-drafting

Avg Split 01:06:00

Flat bike course in London.

🏃 Run

Distance 10km

Elevation ↑10m

Surface road

Topology loop

Avg Split 00:52:00

Run through London.

Transition Details

T1 — Swim → Bike

T2 — Bike → Run

T1/T2 are in different locations · Surface: pavement

Weather

Air Temp 20°C 12°–23°C

Humidity 60%

Rain Chance 19%

Wind 15 km/h

Typical: 20°C, 60% humidity.

Registration

Registration Opens januari

Entry Cost €178

Time Limit 4h

https://example.com/london-triathlon

The Story

The London Triathlon is Europe's largest triathlon — a statement that sounds like marketing until you see 13,000 athletes flow through the ExCeL centre in Royal Victoria Dock over a single weekend. It is a participation event on a scale that most races can only dream of.

The Olympic and Sprint distances share the same venue but deliver different experiences. The sprint — 750m swim, 20km bike, 5km run — is where London Triathlon finds its broadest audience. This is the distance that turns curious runners into triathletes, that corporate challenge teams enter, that first-timers choose because it seems manageable and then discover is anything but easy when you're actually racing it.

The dock swim is enclosed, calm, and dark. Royal Victoria Dock was built to berth cargo ships, not host athletes, and the water retains that industrial heritage. At 750m, the swim is short enough to be survivable for any reasonable swimmer and long enough to establish your place in the race.

The bike through Docklands and the Limehouse Link tunnel is flat, fast, and surreal. The run around the ExCeL centre is where the sprint distance shows its teeth — at this intensity, 5km is not a jog, it's a sustained effort that finds every weakness the bike left behind.

London Triathlon's genius is scale. It normalises triathlon. When 13,000 people are doing it — colleagues, neighbours, parents, first-timers — the sport stops being exotic and starts being accessible. That's how participation cultures are built.

"I entered the sprint because I thought it would be easy. It wasn't. But I signed up for next year before I'd finished the post-race banana."

First-time finisher — London Triathlon sprint

"Thirteen thousand people doing triathlon in a single weekend. That's not a race — that's a movement."

Triathlon journalist — London Triathlon coverage

What It Feels Like

The London Triathlon sprint is the UK's gateway triathlon: flat, safe, well-organised, and absolutely enormous. The course removes every excuse not to try triathlon and replaces it with 13,000 people proving it's possible.

🏊 The Swim

750m in the Royal Victoria Dock. Enclosed, calm, no current. The water is dark but the distance is manageable. For nervous first-timers, the controlled conditions remove the scariest open-water variables. For racers, it's 10-12 minutes of pure speed.

🚴 The Bike

20km of flat Docklands roads including the Limehouse Link tunnel. Fast, well-surfaced, and exhilarating. The flat profile rewards aerodynamic position even at sprint distance — those 20km go quickly.

🏃 The Run

5km around the ExCeL centre and dockside. Flat and well-supported. At sprint intensity, this 5km hurts — it's a threshold effort from the first step. The crowd support helps, especially in the final kilometre.

Legendary Moments

1998

The First London Triathlon

The inaugural London Triathlon draws a modest field to the Docklands. The sprint distance is offered alongside the Olympic, planting the seed for what becomes Europe's largest triathlon.

2015

The Sprint Boom

Sprint-distance entries exceed 8,000 for the first time. The London Triathlon sprint becomes the entry point for a generation of British triathletes.

💡 Insider Tips

→ Sprint distance rewards going hard from the gun. Don't save energy — this is 45-75 minutes of sustained effort. Warm up properly before your wave start so you're ready to race immediately.
→ The dock swim is dark. Practice in open water before race day, even if it's just a few sessions. The transition from pool to open water catches more first-timers than the fitness itself.
→ With thousands of athletes, transitions are crowded. Practice your T1 and T2 sequences until they're automatic. Know your rack position. Lay out your kit simply — complexity costs time.