What is the water temperature at Lyon Triathlon 70.3 and can I wear a wetsuit?

The swim takes place in river water with an average temperature of 14°C during race month. Wetsuits are conditional — typically depends on race-day water temperature.

How hilly is the Lyon Triathlon 70.3 bike course?

The 90km bike course has 284m of elevation gain and is classified as flat. The course is loop on road surface. Drafting is not allowed.

What is the weather like on race day at Lyon Triathlon 70.3?

Expect temperatures between undefined°C and undefined°C (average 17°C) with 37% humidity. There is a 22% chance of rain and average wind speeds of 5 km/h. Typical conditions in Lyon

How big is the Lyon Triathlon 70.3 and when was it first held?

The Lyon Triathlon 70.3 was established in 2014 (12 years ago) and has approximately 1,370 finishers per edition.

What is the average finish time for Lyon Triathlon 70.3?

The average finish time is approximately 5 hours and 30 minutes. This can vary based on weather conditions, course difficulty, and athlete experience level.

What are the swim conditions like at Lyon Triathlon 70.3?

The 1900m swim is in river water with calm conditions. The format is open-water. River swim in Lyon

Lyon Triathlon 70.3 — Guide, Training Plan & Tips

Average Finish Time 05:30:00

Total Finishers 1,370

Temperature 17°C

Water Temperature 14°C

Bike Elevation ↑284m

Established 2014

"Fast and flat — Lyon's Lyon Triathlon 70.3 is built for personal bests."

🏊 Swim

Distance 1900m

Water river (open-water)

Water Temp 14°C

Wetsuit conditional

River swim in Lyon

🚴 Bike

Distance 90km

Elevation ↑284m

Profile flat

Drafting Non-drafting

Flat bike course around Lyon

🏃 Run

Distance 21.1km

Elevation ↑42m

Surface road

Topology out-and-back

Run through Lyon

Transition Details

T1 — Swim → Bike

T2 — Bike → Run

T1/T2 are in the same location · Surface: pavement

Weather

Air Temp 17°C

Humidity 37%

Rain Chance 22%

Wind 5 km/h

Typical conditions in Lyon

Registration

Registration Opens Invalid Date

Entry Cost €416

Time Limit 8.5h

https://www.example.com/lyon-triathlon-70-3

The Story

The half-iron distance asks a particular question: can you hold race pace for five-plus hours across three disciplines? In Lyon, the course adds its own follow-up questions. The 1.9km swim sends you into cold flowing river at 14°C — bracing — the kind of cold that sharpens focus. It's long enough that a poor start costs real time, short enough that strong swimmers can build a genuine lead. Then the bike: 90km of flat road where aerodynamics and sustained power decide the race. This is a 90km time trial — the athletes who commit to the aero bars and hold discipline on nutrition pull away. The half-marathon is flat through Lyon's streets — a mercy after the bike, but 21.1km off 90km of cycling is never easy. The athletes who paced the bike correctly run through the field here. What sets this 70.3 apart: Rhône-Saône confluence, silk-district run, bouchon aromas testing your concentration. The kind of half-distance race that makes you understand why 70.3 is where triathlon's competitive heart beats loudest.

"I've done Ironman. I've done sprints. 70.3 is the distance that makes you race honestly — and Lyon is the course that proves it."

Long-course veteran — Post-race interview, Lyon Triathlon 70.3

What It Feels Like

70.3 triathlon with Lyon character. This course suits athletes looking for a fast, friendly 70.3 — first-timers will find it accessible, experienced athletes will find it fast. Five-plus hours of racing through a city this distinctive — the setting adds a dimension no training plan can replicate.

🏊 The Swim

A 1.9km river swim at 14°C. Current adds a variable that changes the race — sometimes helping, sometimes fighting you. Over 1.9km, reading the current correctly can save minutes. Bracing — the kind of cold that sharpens focus. Check the race briefing for swim direction and expected flow conditions.

🚴 The Bike

90km of flat road — this is a 90km time trial and the race's defining leg. Aerodynamic position and sustained power output are everything. There's nowhere to hide on a flat 70.3 bike: no climbs to recover on, no descents to coast. Discipline in the aero bars and smart nutrition separate the podium from the pack.

🏃 The Run

21.1km on flat Lyon streets. The course is forgiving; your legs may not be. A flat run at the end of a 70.3 rewards patience and fuelling discipline. Negative-split this half-marathon: start 10-15 sec/km slower than goal pace and build. The athletes passing people in the last 5km are the ones who got the bike right.

💡 Insider Tips

→ Water temperature averages 14°C — that's cold for a 1.9km swim. Train in cold open water regularly in the weeks before. Your first 400m set the tone: if you can settle into rhythm through the cold shock, you'll swim well. A neoprene cap makes a measurable difference.
→ The flat 90km bike course rewards aerodynamic position over raw power. This is a time-trial on open roads — every second you spend out of the aero bars costs time. A professional bike fit is the cheapest speed you'll find for a flat 70.3.
→ River swims can have current — over 1.9km this matters more than in shorter distances. Check the race briefing for swim direction and expected flow. Position yourself to use the current where possible, and ferry-glide at an angle across any cross-current rather than fighting it head-on.