IRONMAN 70.3 Rio de Janeiro
Rio de Janeiro, Brazil · August · IRONMAN
Why people love it
- Copacabana beach swim at 21 to 23 °C (70 to 73 °F) with a city backdrop
- Bike on the Rio 2016 Olympic route past Sugarloaf and Christ the Redeemer
- Dead flat run: about 30 m (100 ft) over 21.1 km (13.1 mi)
- 2026 course records of 3:50:52 for men and 4:14:15 for women
Watch out for
- Ocean swell was reported rough in 2026 despite sheltered descriptions
- Tunnels, tight turnarounds and a long run from water to T1 inside the fort
- Little shade on the run and humid heat
- Bike elevation sources conflict; check the current athlete guide
Race
How racers feel about it, how well it is run, and how it treats a first timer. Counts for 27% of the overall score.
- Racer satisfactionLoved3.9
The organiser's guide cites a 95.4% satisfaction survey for 2024, which is promotional. Independent reports are few and one 2026 finisher found the swim hard. · Low confidence
- OrganizationWell run4.0
Experienced local organiser with nine editions by 2025 and closed city roads. Cramped T1 access is the main gripe. · Medium confidence
- First timer friendlyDoable3.0
Ocean swell, a long T1 run, tunnels and tight turnarounds make it more technical. · Low confidence
Course traits, not part of the score
- PR potentialFast3.8
2026 course records of 3:50:52 and 4:14:15 on a flat run and mostly flat bike. · Medium confidence
- Course easeModerate3.6
Flat course, with swell and heat adding difficulty. · Low confidence
Swim
Wetsuit odds, water temperature, calm, and the experience of the start. Counts for 15% of the overall score.
- Wetsuit legalUsually3.7
Water of about 21 to 23 °C (70 to 73 °F) in August is under the 24.5 °C (76 °F) limit. Rule not confirmed. · Low confidence
- Water temperatureIdeal4.5
22 to 23 °C (72 to 73 °F) sits at the warm end of the ideal range. · Medium confidence
- Calm waterSome chop2.8
Previews say sheltered, but a 2026 finisher reported a rough rolling swell. · Low confidence
- Swim easeModerate3.2
Ocean swell and a long run to T1 inside the fort. · Low confidence
- Swim experienceGreat4.1
Copacabana beach start with a city backdrop. · Low confidence
Bike
Road surface, closures, scenery and wind. Counts for 19% of the overall score.
- Road surfaceMixed3.4
Smooth avenues with rougher patches near tunnels. · Low confidence
- Road closuresMostly closed4.2
The city traffic authority closes the route. · Medium confidence
- Bike scenerySpectacular4.6
Sugarloaf and Christ the Redeemer views along the Olympic route. · Medium confidence
- WindSome wind3.0
Usually moderate onshore wind. · Low confidence
Course traits, not part of the score
- Bike speedFast3.6
Mostly flat, but tunnels, turnarounds and wind slow it. · Low confidence
- Bike flatnessMostly flat4.2
Billed flat, but sources conflict on the gain. · Low confidence
- Bike simplicitySome technical parts2.5
Tunnels and tight turnarounds. · Low confidence
Run
Crowds, aid stations, conditions underfoot and scenery. Counts for 13% of the overall score.
- Crowd supportStrong3.9
The course was designed to be closer to local fans. · Low confidence
- Aid stationsGood3.8
Standard IRONMAN provision assumed. · Low confidence
- Run sceneryBeautiful4.3
Aterro do Flamengo with bay and mountain views. · Low confidence
- Run conditionsModerate3.3
Flat, but little shade and humid conditions in 2026. · Low confidence
Course traits, not part of the score
- Run flatnessFlat4.8
About 30 m (100 ft) or less over 21.1 km (13.1 mi). · High confidence
Conditions
Air temperature, how predictable the weather is, setting, and spectating. Counts for 15% of the overall score.
- Air temperaturePleasant3.5
21 to 29 °C (70 to 84 °F) with humidity. August is the drier, milder season. · Medium confidence
- Weather reliabilityReliable3.7
August is drier, though one race listing showed strong gusts. · Low confidence
- Venue beautyStunning4.8
Copacabana, Sugarloaf and Christ the Redeemer. · Medium confidence
- Spectator friendlyEasy4.3
Three run laps and a family area. · Low confidence
Course traits, not part of the score
- Low altitudeSea level5.0
Sea level, about 5 m (16 ft). · High confidence
Stay and travel
Hotels, walkability, getting there, and the town around the race. Counts for 11% of the overall score.
- Hotel availabilityPlentiful4.5
Very large hotel market. · Low confidence
- Hotel valueNormal3.3
No race-week price data found. · Low confidence
- WalkabilitySome driving3.2
T1 is at Copacabana Fort and the finish at Marina da Gloria. · Low confidence
- Travel easeEasy3.6
Two airports within about 25 km (16 mi), though long haul for most. · Medium confidence
- LogisticsSome complexity3.0
Separate T1 and finish areas, plus tunnels. · Low confidence
- Town and foodGreat4.5
World-class city for food and nightlife. · Medium confidence
Key facts
- Location
- Rio de Janeiro, Rio de Janeiro, Brazil
- Typical month
- August
- Latest or next date
- 8 August 2027
- Organiser
- IRONMAN
- Field size
- About 1,900 athletes
- Entry fee
- About $650
- First held
- 2016
- Distances
- 1.9 km (1.2 mi) swim, 90 km (56 mi) bike, 21.1 km (13.1 mi) run
- Swim venue
- Copacabana Beach, start near Copacabana Fort (post 6) (ocean)
- Water temperature
- 21–23 °C (70–73 °F)
- Wetsuit
- Likely legal in August (preview, unconfirmed)
- Swim start
- rolling (not confirmed)
- Swim laps
- 1
- Bike laps
- 2
- Key climbs
- Marcello Alencar Tunnel
- Run climbing
- 30 m (98 ft)
- Run laps
- 3
- Run shade
- Little shade
- Air temperature
- 21–29 °C (70–84 °F)
- Humidity
- High; 2026 had heat and high humidity
- Altitude
- 5 m (16 ft)
- Nearest airport
- Santos Dumont (SDU) about 10 km (6 mi); Galeao (GIG) about 25 km (16 mi), 10 km (6 mi) away
- Where to stay
- Copacabana, Flamengo
- Booking
- Large hotel market; Copacabana and Flamengo hotels near the course.
What racers and reviewers say
- Correio da Manha (Petropolitano)Raced 2026 · article · Mixed
First-time 70.3 finisher said the Copacabana swim was the hardest part: no breaking waves, but rolling swell that sapped strokes and caused early anxiety. He scored his own performance 6.5 out of 10.
- A CriticaRaced 2026 · article · Positive
Age-group podium finisher qualified for the 2027 Worlds; five athletes of her team got slots. No course conditions discussed.
- Correio da ManhaRaced 2026 · article · Positive
Race-week preview: fast, technical layout using much of the Rio 2016 Olympic route with Sugarloaf and Christ the Redeemer views; 37 pros, custom finisher medals and a family poster area.
- BestBikeSplitRaced 2026 · aggregator · Mixed
Course preview: sheltered out-and-back swim with a long run to T1 inside the fort, smooth avenue bike with rougher patches near tunnels, moderate onshore wind, flat little-shade run.
- Unlimited Sports (organizer)Raced 2026 · article · Positive
Organizer results page: 2026 course records by Stojanovic and Arnold in heat and high humidity; new route is closer to local fans; Worlds slots on offer.
Show 2 more
- IRONMAN Rio 2025 athlete guide (via Unlimited Sports)Raced 2025 · article · Positive
Official guide (promotional) says a global IRONMAN athlete survey ranked the 2024 race the second most recommended 70.3, with 95.4% overall satisfaction; about 1,800 athletes from 33 countries expected in 2025.
- ProTriNewsRaced 2026 · aggregator · Mixed
Course listing: 22 C (72 F) water with wetsuit likely, two-lap flat bike through Marcello Alencar Tunnel, three-lap flat run; race-day gusts up to 73 km (45.4 mi)/h (45 mph) listed.
Sources
Pages we used for facts and ratings. See how we rate.
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