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Triathlon Atlas
A large lake at first light with mist over the surface

Swim conditions

Triathlon water temperature: where the swim is cold, and where it is warm

The organiser publishes an average water temperature for 148 of 159 races. Read on 22 September 2026, it runs from 14 °C to 29 °C.

Filter races by water temperature

Method

One published figure per race

The value held for each race is the average water temperature shown on its own page. The organiser presents it as a guide drawn from previous editions. The temperature on race morning can sit a few degrees either side, and the wetsuit decision is taken then.

This page uses those averages to show where and when the water is cold or warm. The water temperature guide explains what the figure is and how the finder treats races that publish none.

Ripples on clear lake water in morning light

Set a ceiling on the water

Move the water slider in the finder. Races that publish no temperature are hidden while it is on, and the finder says how many.

159

races, all of them

Distance
Month
Region
Country
Swim venue
Bike
Run
Water temperature

14 °C is the coldest average published, 29 °C the warmest.

Full distance 41 Half distance 111 Short course 7
RaceDateCountryDistanceSwimWaterBikeRunEntries
IRONMAN 70.3 World Championship Nice12 Sept 2026FRHalf distanceOcean16 °C Hilly FlatOpen
IRONMAN 70.3 New York Jones Beach26 Sept 2026USHalf distanceBay18 °C Flat FlatOpen
IRONMAN 70.3 Augusta Augusta27 Sept 2026USHalf distanceRiver23 °C Rolling RollingOpen
IRONMAN Chattanooga Chattanooga27 Sept 2026USFull distanceRiver24 °C Rolling RollingOpen
IRONMAN Gurye Korea Gurye4 Oct 2026KRFull distanceReservoir24 °C Flat HillyOpen
IRONMAN Calella-Barcelona Calella4 Oct 2026ESFull distanceOcean23 °C Flat FlatOpen
IRONMAN 70.3 Waco Waco4 Oct 2026USHalf distanceRiver26 °C Flat RollingOpen
IRONMAN 70.3 Buenos Aires Palermo Buenos Aires4 Oct 2026ARHalf distanceLake23 °C Rolling FlatOpen
5150 Coquimbo Coquimbo4 Oct 2026CLShort courseOcean15 °C Flat FlatOpen
IRONMAN World Championship Kona10 Oct 2026USFull distanceOcean26 °C Rolling RollingOpen
IRONMAN 70.3 Encarnacion Encarnacion11 Oct 2026PYHalf distanceRiver20 °C Hilly FlatOpen
IRONMAN 70.3 Versailles Versailles11 Oct 2026FRHalf distanceReservoir21 °C Rolling FlatOpen
IRONMAN 70.3 Sharm El-Sheikh, Egypt Sharm El-Sheikh16 Oct 2026EGHalf distanceBay28 °C Rolling FlatOpen
IRONMAN 70.3 North Carolina Wilmington17 Oct 2026USHalf distanceOcean19 °C Flat RollingOpen
IRONMAN 70.3 Portugal-Cascais Cascais17 Oct 2026PTHalf distanceBay18 °C Rolling RollingOpen
IRONMAN Portugal-Cascais Cascais17 Oct 2026PTFull distanceBay18 °C Rolling RollingOpen
IRONMAN 70.3 Poreč Porec18 Oct 2026HRHalf distanceOcean21 °C Rolling RollingOpen
IRONMAN California Sacramento18 Oct 2026USFull distanceRiver17 °C Flat FlatOpen
IRONMAN 70.3 Port Macquarie Port Macquarie18 Oct 2026AUHalf distanceRiver23 °C Rolling FlatOpen
IRONMAN Australia Port Macquarie18 Oct 2026AUFull distanceRiver23 °C Rolling FlatOpen
IRONMAN 70.3 Florianopolis Florianopolis18 Oct 2026BRHalf distanceOcean22 °C Flat FlatOpen
IRONMAN 70.3 Málaga Málaga18 Oct 2026ESHalf distanceOcean20 °C Flat FlatOpen
IRONMAN 70.3 Dhofar Salalah24 Oct 2026OMHalf distanceBay27 °C Rolling FlatOpen
IRONMAN 70.3 Costa Navarino, Peloponnese, Greece Peloponnese25 Oct 2026GRHalf distanceOcean23 °C Rolling FlatOpen
IRONMAN 70.3 Agadir Agadir25 Oct 2026MAHalf distanceOcean21 °C Rolling FlatOpen
5150 San Juan San Juan30 Oct 2026ARShort courseReservoir22 °C Flat FlatOpen
IRONMAN 70.3 Kenting Kenting1 Nov 2026TWHalf distanceOcean25 °C Flat FlatOpen
IRONMAN 70.3 Goa Goa1 Nov 2026INHalf distanceOcean26 °C Hilly HillyOpen
IRONMAN 70.3 Türkiye Belek1 Nov 2026TRHalf distanceOcean25 °C Flat FlatOpen
IRONMAN San Juan San Juan1 Nov 2026ARFull distanceReservoir22 °C Rolling RollingOpen

Read from the organiser’s own pages on 22 Sept 2026

By region

The region matters more than the month

Grouped by region, the published averages spread widely, and the ordering follows latitude and ocean currents:

  • Europe: median 20 °C across 53 races
  • Oceania: median 20 °C across 12 races
  • Africa: median 21 °C across 6 races
  • North America: median 22 °C across 35 races
  • Latin America: median 23 °C across 25 races
  • Middle East: median 23 °C across 5 races
  • Asia: median 28.5 °C across 12 races

Grouped by month instead, the medians stay within a few degrees of each other all year, because the calendar follows the seasons: races are scheduled when the local water is at a workable temperature.

A tropical bay with warm turquoise water and a sandy shore

Both ends of the range

33 races at 18 °C or below, 39 at 24 °C or above

At the cold end, 33 races publish an average of 18 °C or less. A wetsuit is close to universal there where it is allowed, and a swim shortened for conditions is a real possibility.

At the warm end, 39 races publish 24 °C or more. Above roughly that point wetsuit use is commonly restricted, and swim comfort becomes a question of heat. This site does not hold the thresholds themselves, because they depend on the rules applied to each race and are not published as a field.

A cold lake with dark still water and a rocky shore

Side by side

Compare the water alongside the rest

Water rarely decides a race on its own. Put it next to the month, the region and the course labels.

FieldNo race selectedNo race selectedNo race selected
Distancenot publishednot publishednot published
Datenot publishednot publishednot published
Countrynot publishednot publishednot published
Registrationnot publishednot publishednot published
Swim venuenot publishednot publishednot published
Average water temperaturenot publishednot publishednot published
High air temperaturenot publishednot publishednot published
Low air temperaturenot publishednot publishednot published
Bike profilenot publishednot publishednot published
Bike elevation gainnot publishednot publishednot published
Run profilenot publishednot publishednot published
Run elevation gainnot publishednot publishednot published
Overall cut-offnot publishednot publishednot published
World championship slotsnot publishednot publishednot published
Altitudenot publishednot publishednot published
First editionnot publishednot publishednot published
Swim startnot publishednot publishednot published

Rows marked “not published” are fields no source publishes for these races. No score is computed from the rows above: a single number would hide which of them decided it. Figures read on 22 Sept 2026.

The 11 races that publish no temperature

These races stay in every list on this site with an empty water cell. They are IRONMAN 70.3 San Salvador, IRONMAN 70.3 Laoag, IRONMAN 70.3 Curitiba, IRONMAN 70.3 Puerto Varas, IRONMAN 70.3 Barranquilla, IRONMAN Penghu, IRONMAN 70.3 Brasilia, IRONMAN 70.3 Northern California, IRONMAN 70.3 Omaha, IRONMAN 70.3 Ruidoso New Mexico, IRONMAN 70.3 Boise.

If one of them matters to you, the organiser's athlete guide or a message to the race office is the place to ask. If you find a published figure, the contact page takes it.

Coverage

The fields behind this page

Counted from the records held here, read on 22 September 2026.

Not published anywhere

World championship slots
On a separate page per race, and it changes every year.
Altitude
Not published. It can be derived from the coordinates, and is not yet.
First edition
Not published by the organiser.

Counted from this site’s own records, read on 22 Sept 2026.

Questions this page is asked

Which race has the coldest water?

The lowest published average is IRONMAN Valdivia, IRONMAN 70.3 La Quinta, at 14 °C.

Which race has the warmest water?

The highest published average is IRONMAN 70.3 Phu Quoc, IRONMAN Malaysia, IRONMAN 70.3 Langkawi, IRONMAN 70.3 Cartagena, IRONMAN 70.3 Los Cabos, IRONMAN Vietnam, IRONMAN 70.3 Davao Philippines, IRONMAN 70.3 Desaru Coast, IRONMAN 70.3 Cozumel, at 29 °C.

Will I be allowed a wetsuit?

That is decided on race morning against the measured temperature and the rules that apply to the race. The published average tells you which answer is likely.

Why is the median by month so flat?

Because organisers schedule each race for the season when its local water is usable. A cold-water race in June and a warm-water race in December both land near the middle of the range.

Next step

Filter the calendar on the water you want

Set a ceiling, then add the month and the region.

Open the race finderCompare a shortlist
A wide river estuary at sunrise meeting the sea