A heatwave that began on 4 July, the opening day of the Tour de France, has pushed daily maximum temperatures above 35 °C for more than a week, with several stages seeing readings over 40 °C. The extreme conditions prompted the first ever shortening of a Tour stage, a historic departure from a 110‑year record of completing each stage as planned.

Impact on riders

Riders have reported cramps, exhaustion and symptoms of heat‑stroke. Body‑temperature measurements above 40 °C have been recorded for some cyclists, and medical personnel have had to intervene more often than usual. One competitor lost 4.5 kg of body weight during a single stage, while another likened the air to opening an oven door. After finishing, many cyclists took ice baths and were wrapped in ice by support staff, and cooling vests are now being fitted before the start of each stage.

Team and organisational adaptations

Teams have deployed emergency cooling measures and, following a UCI rule change, are now allowed to carry larger water bottles. One team used roughly 180 bottles, equivalent to about 11 litres per rider, on a stage. Local authorities have added extra water stations and medical teams, increasing public‑service costs at a time of budget pressure.

The UCI heat protocol, which includes shaded start areas, extra hydration stations and the option to cancel a stage, has never been invoked to cancel a stage in the Tour’s history, although wildfires in southern France almost forced a cancellation. The protocol does allow for a stage to be shortened, a measure that was applied for the first time this year.

Expert and official commentary

Four‑time winner Tadej Pogačar, who is leading the race, indicated that the calendar should be altered to avoid racing in July and August in hot locations. Climate expert Benjamin Sultan, an IPCC contributor, called for urgent adaptation, proposing a shift to cooler months, more northern routes or earlier start times such as 05:00. Sultan warned that heatwaves could become twice as common in the coming decades and highlighted the tension between economic interests and public health and safety.

Tour director Christian Prudhomme stressed that adaptation is the guiding principle and that rising temperatures are a worldwide phenomenon. Organisers warned that moving the race to cooler periods or northern routes could reduce television viewership and on‑site spectators, thereby affecting sponsorship income.

Broader sporting context

The French Open this spring recorded unprecedented temperatures, with a player collapsing and describing the conditions as extreme. Earlier in the year the Australian Open activated its extreme‑heat protocol, closing roofs and halting outdoor matches.

Unions representing race staff have raised safety concerns and asked for clearer rules on when a stage should be stopped, underscoring the growing pressure on the sport to balance competitive tradition with rider welfare in an era of climate‑driven heat extremes.