Ironman 70.3 Weymouth
Half Ironman / 70.3 Ironman

Ironman 70.3 Weymouth

Weymouth, United Kingdom · SEP 2026

🏊 1900m
🚴 90km
🏃 21.1km
38

Triathlon Index Score

Challenging

Average Finish Time 06:06:00
Total Finishers 2 855
Temperature 16°C
Water Temperature 15°C
Bike Elevation ↑700m
Established 2016

"Cold-water ocean swim and rolling bike course in the rugged beauty of Weymouth."

🏊 Swim

Distance 1900m
Water ocean (open-water)
Water Temp 15°C
Wetsuit allowed
Avg Split 00:44:00

Ocean swim in Weymouth.

🚴 Bike

Distance 90km
Elevation ↑700m
Profile rolling
Drafting Non-drafting
Avg Split 03:10:00

Rolling bike course in Weymouth.

🏃 Run

Distance 21.1km
Elevation ↑66m
Surface road
Topology out-and-back
Avg Split 02:12:00

Run through Weymouth.

Transition Details

T1 — Swim → Bike
T2 — Bike → Run

T1/T2 are in different locations · Surface: grass

Weather

Air Temp 16°C 8°–22°C
Humidity 65%
Rain Chance 6%
Wind 23 km/h

Typical: 16°C, 65% humidity.

Registration

Registration Opens mars
Entry Cost €355
Time Limit 8.5h
Register Now →

https://example.com/ironman-70-3-weymouth

The Story

Weymouth has been a racing venue since the 2012 Olympics brought open-water events to the Dorset coast. The English Channel waters off Weymouth Bay are colder and more dynamic than the Mediterranean, and the Dorset countryside behind the coast is a UNESCO World Heritage landscape of rolling chalk hills, ancient field patterns, and the kind of English coastal beauty that Thomas Hardy wrote novels about.

The sea swim in Weymouth Bay is cold (15-17°C) and Channel-influenced: currents, chop, and the ever-present possibility that the English weather will make race morning interesting. The bay provides some shelter from the full Channel, but the water still has a weight and unpredictability that calm-water swimmers find demanding. You wade in past the sandy beach where generations of English families have built sandcastles, and within seconds the cold takes hold. The Channel water is grey-green, salty, and purposeful — it has places to be, and it doesn't particularly care that you're trying to swim in a straight line. Sighting the buoys against the grey water on overcast mornings requires concentration. On the rare sunny morning, the bay transforms — the water turns jade, the chalk cliffs glow white, and Weymouth looks like a watercolour painting.

The bike heads inland through the Dorset hills on rolling roads that climb and descend through the Jurassic Coast hinterland. This is classic English cycling: hedgerows pressing in from both sides, narrow lanes that wind through valleys and over ridges, short steep climbs that appear without warning, and descents that demand attention because the English countryside doesn't believe in straight roads. Seven hundred metres of climbing accumulates through terrain that's been farmed for five thousand years — the field patterns are Bronze Age, the stone walls are Medieval, and the tarmac is Modern (mostly). The Dorset countryside is understated beautiful: not dramatic in the Alpine sense, but quietly, persistently lovely in the way English landscape is when it decides to cooperate.

The run traces the Weymouth seafront, past the Georgian townhouses and along the promenade where the English seaside tradition — fish and chips, windbreaks, stoic enjoyment of marginal weather — provides the finish-line backdrop. The course is flat and fast along the front, with the harbour providing a sheltered section and the beach providing the views. English seaside crowds are a specific breed: they're wrapped in layers regardless of the temperature, they clap politely, they say 'well done' in tones that convey genuine respect, and they offer you chips. The children are enthusiastic. The dogs are confused.

Weymouth's Jurassic Coast connection adds geological depth that no other 70.3 offers. The Dorset coastline is a 185-million-year geological timeline — the rocks on the headlands contain fossils from the Jurassic period, and the landscape you ride through was the sea floor when dinosaurs walked. The race passes through Hardy country — the Wessex of Tess of the d'Urbervilles and Far from the Madding Crowd — adding literary layers to the geological ones. Whether or not you care about fossils and Victorian novelists, the landscape they created and described is the landscape you're racing through, and it's beautiful.

The Channel is not the Mediterranean. The Dorset hills are not flat. The weather is not guaranteed. But the racing is honest, the community is strong, and the post-race fish and chips on the harbour — wrapped in paper, eaten on the quay wall while your legs seize up — are an integral part of the recovery protocol. Weymouth 70.3 is the English coastal endurance experience: salt, chalk, heritage, and the quiet satisfaction of racing through a landscape that's been here since before humans learned to run.

"The Dorset countryside on the bike is Thomas Hardy in lycra. Rolling hills, hedgerows, and the feeling that nothing has changed for centuries. Except the speed."

English age-grouper — Ironman 70.3 Weymouth 2023

"The Channel water doesn't mess about. It's cold, it's grey, it moves. You earn every metre of that swim."

Welsh triathlete — Post-race report

"Weymouth is the honest English triathlon. No glamour, no gimmicks. Cold water, rolling hills, and fish and chips at the finish. It's perfect."

Scottish first-timer — Race blog, 2022

"The Jurassic Coast geology is 185 million years old. My run split is about 2 hours old. Everything is relative."

Race veteran — Social media, finish line

What It Feels Like

Ironman 70.3 Weymouth is the English coastal 70.3 — honest, scenic, and unapologetically British. The Channel swim demands cold-water respect. The Dorset hills demand rolling-terrain fitness. The seafront run rewards steady pacing in typically cool conditions. What makes Weymouth special is its depth: the Jurassic Coast geology adds a 185-million-year backdrop to your race, the Hardy country landscape adds literary resonance, and the English seaside atmosphere adds a warmth and community that makes the finish feel like a homecoming. Nearly 3,000 athletes and 60 nations confirm that Weymouth delivers substance over spectacle — and that sometimes, the honest English version is exactly what you want.

🏊 The Swim

Weymouth Bay in the English Channel: 15-17°C, grey-green, and dynamic. The bay provides partial shelter from the full Channel, but the water still carries current, chop, and the particular coldness of English coastal swimming. Wetsuits are mandatory and essential. The cold-water experience is similar to Dun Laoghaire but marginally warmer — still demanding, still requiring acclimatisation, still sorting the prepared from the hopeful. The bay is sandy-bottomed and relatively shallow near the start, deepening as you move out. On overcast days, the water is grey and the sighting is challenging. On sunny days, the bay transforms into something genuinely beautiful — jade water, white cliffs, blue sky. You never know which version you'll get until race morning.

🚴 The Bike

Dorset's rolling chalk hills: 700m of climbing through hedgerow-lined lanes, farmland, and villages. The terrain is classic English cycling — short, punchy climbs of 1-3 minutes at moderate-to-steep gradients, winding descents through narrow lanes, and rolling flats between. The road surfaces are generally good but variable — watch for drainage grates and rough patches on the country lanes. The scenery is Jurassic Coast hinterland: chalk downs, ancient field patterns, thatched villages, and views of the distant coast on clear days. There's no single defining climb — instead, the 700m accumulates through constant undulation that never lets you settle into a flat-road rhythm. This is a bike course that rewards adaptability and punchy fitness.

🏃 The Run

The Weymouth seafront: flat, coastal, and English. You run along the promenade past Georgian townhouses, the harbour, and the beach where English families do what English families do at the seaside — build sandcastles, eat ice cream, and wrap themselves in windbreaks regardless of the temperature. The September weather is typically 15-20°C — ideal for running, even if it looks grey. The spectator support is concentrated along the front and at the harbour, with the particular warmth of English seaside communities who've seen races come and go. The two-lap format means you know the course the second time around, and the harbour turnaround provides a mental checkpoint that breaks the half-marathon into manageable segments.

Legendary Moments

2016

Weymouth Gets Its 70.3

Ironman 70.3 arrives in Weymouth, capitalising on the Olympic legacy of the 2012 open-water events held in the same bay. The Dorset coast and the Jurassic Coast World Heritage designation add geological prestige to the race's identity.

2019

60 Nations on the Dorset Coast

Weymouth draws 60 nationalities — extraordinary for an English seaside town. The international field reflects both the course's quality and the Jurassic Coast's tourism appeal. Athletes come for the race and stay for the fossils.

2022

The Channel Storm

A September storm brings heavy seas and wind to Weymouth Bay. The swim is shortened for safety. Athletes who complete the full bike course in driving rain and Dorset wind earn a particular kind of English respect.

2023

The Sunshine Edition

Rare September sunshine produces perfect conditions. The chalk cliffs glow white, the bay turns jade, and athletes post fast times while struggling to believe they're racing in England. The Dorset coast, when it cooperates, is world-class.

💡 Insider Tips

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FAQ

What distance is the Ironman 70.3 Weymouth? +

The Ironman 70.3 Weymouth is a Half Ironman / 70.3 distance triathlon: 1900m swim, 90km bike, and 21.1km run (113km total) in Weymouth, United Kingdom.

When is the Ironman 70.3 Weymouth? +

The next edition is on September 9, 2026. The race is typically held in September.

Water temperature and wetsuit rules? +

Ocean water at 15°C average. Wetsuits are allowed.

How hilly is the bike course? +

700m of climbing over 90km. Profile: rolling. Drafting not allowed.

What's the weather like on race day? +

8–22°C, 65% humidity, 6% rain chance, 23 km/h winds.

Average finish time? +

Approximately 6h 6m. Varies with conditions and athlete experience.

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