Skip to content
Triathlon Atlas

Half distance · 8 August 2027

IRONMAN 70.3 Rio de Janeiro

Rio de Janeiro, Brazil

The race at a glance

Official race website
Circuit
IRONMAN
Distance
Middle distance
Terrain
Road
Swim
1.9 km
Bike
90 km
Run
21.1 km
Date
8 Aug 2027
Registration
Sold out
Swim venue
Ocean
Average water temperature
23 °C
Bike profile
Flat
Bike elevation gain
367 m
Run profile
Flat
Run elevation gain
96 m
High air temperature
29 °C
Low air temperature
21 °C
Overall cut-off
8 h 30 min
Altitude
2 m
First edition
2016
Swim start
Rolling start

Edition history

20269 Aug 2026Held
202510 Aug 2025Held
202423 Jun 2024Held
20239 Jul 2023Held
20223 Jul 2022Held
201922 Sept 2019Held
201830 Sept 2018Held
20171 Oct 2017Held

How the day is laid out

The swim is held in the ocean. An average of 23 °C is close to the threshold where wetsuit rules start to tighten. Plan for both answers and check the call on race morning.

The bike leg is labelled flat.

The run is labelled flat.

A flat bike followed by a flat run is the most predictable combination on the calendar. It removes climbing and the descents that come with it, so power output stays constant for the whole bike leg and wind becomes the main variable.

Expect air between 21 °C and 29 °C on race day. A spread of 8 degrees across the day matters as much as the peak, because what you wear at the swim exit is rarely what you want at the far end of the bike.

Against the calendar

Where this race sits among the others

Ranks are computed across every race of the same distance.

  • Average water temperature

    23 °C · median 21 °C

    The 48th warmest of the 128 middle-distance races with a figure, across every circuit.

  • High air temperature

    29 °C · median 25 °C

    The 40th hottest of the 152 middle-distance races with a figure, across every circuit.

  • Bike elevation gain

    367 m · median 569 m

    The 28th flattest of the 105 middle-distance races with a figure, across every circuit.

43

races of this distance pair a flat bike with a flat run, out of 159. 53 share the bike profile alone.

42

races across every distance fall in August, out of 354.

43

races are held in Latin America. 2 of them in the same month as this one.

Questions about this race

When is IRONMAN 70.3 Rio de Janeiro 2027?
IRONMAN 70.3 Rio de Janeiro is held on 8 August 2027 in Rio de Janeiro, Brazil. The race is sold out.
Is a wetsuit allowed at IRONMAN 70.3 Rio de Janeiro?
Most likely. The average water temperature is 23 °C, below the 24.5 °C limit up to which wetsuits are allowed for age-group athletes. The official call is made on race morning.
What is the cut-off at IRONMAN 70.3 Rio de Janeiro?
The course closes 8 h 30 min after the start. Intermediate cut-offs after the swim and the bike are in the athlete guide.
How hard is IRONMAN 70.3 Rio de Janeiro?
The bike course climbs about 367 m, the 28th flattest of 105 half-distance races with a figure. The bike is labelled flat and the run flat. Expect highs of about 29 °C on race day.

Where to stay

Hotels and rentals around the race venue, for the nights around race day.

Suggested stay: 6 Aug 2027 to 9 Aug 2027

The map is provided by Stay22. Bookings are made with the provider.

Races of the same distance in the same region

Entries are handled by the organiser

Registration and the athlete guide are on the official race page.

Open the official race page