Guide
Water temperature, race by race
The organiser publishes an average water temperature for 148 of the 159 races on the calendar. Read on 22 September 2026, they run from 14 °C to 29 °C.
Method
What the published figure describes
The value held here is the average water temperature the organiser publishes on each race's own page. It is an expectation drawn from previous editions, and the organiser presents it that way.
It is the only temperature figure published, so it is the only one this site holds. Wetsuit legality is decided on the morning of the race against the temperature actually measured.
The cold end of the range
The coldest published averages sit at 14 °C. At that temperature a wetsuit is close to universal where one is allowed, and a swim shortened or cancelled for conditions is a real possibility. Races at this end of the range cluster in early and late season, and in mountain or northern water.
33 races of the 148 that publish a figure sit at 18 °C or below.
The warm end of the range
The warmest published averages reach 29 °C. Above roughly 24 °C wetsuit use is commonly restricted, and the swim becomes a question of heat. This site does not hold those thresholds, because the organiser does not publish which one applies to which race.
39 races of the 148 sit at 24 °C or above.
The races with no published figure
11 races publish no water temperature at all. They stay in every list on this site with an empty cell and keep that empty cell in every list. The water filter hides them while it is on and says how many it hid, since a filter that silently kept unknown values would be answering a question it cannot answer.
Side by side
Compare the water alongside everything else
Water temperature rarely decides a race on its own. Put it next to the month, the labels and the region.
| Field | No race selected | No race selected | No race selected |
|---|---|---|---|
| Distance | not published | not published | not published |
| Date | not published | not published | not published |
| Country | not published | not published | not published |
| Registration | not published | not published | not published |
| Swim venue | not published | not published | not published |
| Average water temperature | not published | not published | not published |
| High air temperature | not published | not published | not published |
| Low air temperature | not published | not published | not published |
| Bike profile | not published | not published | not published |
| Bike elevation gain | not published | not published | not published |
| Run profile | not published | not published | not published |
| Run elevation gain | not published | not published | not published |
| Overall cut-off | not published | not published | not published |
| World championship slots | not published | not published | not published |
| Altitude | not published | not published | not published |
| First edition | not published | not published | not published |
| Swim start | not published | not published | not 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.
Source and reading date
Every temperature on this page was read from the race's own page on 22 September 2026. Averages are revised between editions. If a figure no longer matches the official page, say so and it will be corrected.
Questions
Is the published average reliable?
It is what the organiser expects from previous editions. The water on race morning can sit several degrees either side of it, and the wetsuit call is taken then.
Why hide races with no figure when the filter is on?
Keeping them would treat an unknown temperature as an acceptable one. The line under the slider shows how many the filter removed.
Where are the wetsuit thresholds?
They are set by the rules applied to each race and are not published per race as a field. A single global threshold here would be wrong for part of the calendar.
