Photo: AMAPO, CC BY-SA 3.0 via Wikimedia Commons
Race day
Expected September 2027
Date not confirmed for this season yet. We publish exact dates only after checking the athlete guide.
Cozumel race week and bags, in the app.
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Swim
1.9 km
Ocean
Bike
90 km
Flat, paved, 1.3 laps
Run
21.1 km
Flat, paved, 2 laps
Sea
31°C
30°C to 31°C in race week
Air
31°C
27°C at night
Rain
71%
of race-week days
Wind
13
km/h gusts on a typical day
Course from the organiser's course page. Weather: the seven days around the middle of the race month in 2023, 2024, 2025, averaged (Open-Meteo, ERA5). Sea is the sea off the town, not a reading of the swim. The water temperature that counts is the one officials measure on race morning.
Race week in three parts, the same three the Taperly app uses. Times and deadlines come from the athlete guide.
The 7 days before
Everything that still has time to go wrong, while there is still time to fix it. Nothing you train this week makes you faster on the day, but plenty of it can make you slower.
Must do: Read the athlete guide properly, Check your race entry and category are right, Final equipment check: tyres, brakes, gears, cleats, Arrange care for kids or pets.
Once you arrive
A long day of small errands in a town you do not know, and then an early night. Do them in an order you decided in advance.
Must do: Athlete check-in, Timing chip somewhere you cannot leave without it.
Race morning
If the week went well, this is only a list of things to pick up and put down. It ends when the horn goes, because from there nobody is holding a phone.
Must do: Timing chip on, Race number, Bike on your own rack number.
The same race week, planned day by day in the app.
What goes in each bag. The full list, to tick off bag by bag, is in the app.
What you'll wear · 14
Trisuit, Timing chip, Goggles, Spare goggles
Morning clothes bag · 22
Race documents and photo ID
Bike gear bag (T1) · 24
Helmet, Race number belt, Race number, Number stickers on bike and helmet
Run gear bag (T2) · 7
Running shoes
Not in a bag · 20
Bike box, bike bag or a booked rack, The tools that take the bike apart, Phone charger, Race kit in the cabin, never the hold
IRONMAN 70.3 Cozumel is expected September 2027, in Cozumel, Mexico. The exact day is confirmed by the organiser; until then this is the month it is usually held.
The sea off Cozumel has been around 31°C in race week (30°C to 31°C over 2023, 2024, 2025). Whether wetsuits are allowed is decided on race morning from the measured water temperature.
Swim 1.9 km, Ocean. Bike 90 km, Flat, paved, 1.3 laps. Run 21.1 km, Flat, paved, 2 laps. Read from the organiser's course page.
In race week it has been 27°C at night and 31°C in the day, with rain on 71% of days and gusts around 13 km/h (2023, 2024, 2025).
Everything sorted by the bag it goes in: what you wear, the morning bag, the bike bag and the run bag. The full list, with what changes for Cozumel, is free in the Taperly app.
