Temperature alone does not capture the danger. The WBGT index combines heat and humidity, offering a clearer picture of the strain placed on athletes.
High humidity limits the body’s ability to cool itself. For footballers, that can mean slower recovery between sprints, reduced concentration late in matches and a greater reliance on substitutions. Coaches may need to manage energy earlier, while organisers could face pressure over kickoff times, hydration breaks and medical coverage.
The concern is arriving alongside a severe heatwave across Europe. A report describes temperatures above 40°C, compared with a typical summer level closer to 25°C, while France, Belgium and Spain have faced particularly intense conditions.
That matters beyond the immediate weather forecast. Players preparing in European leagues are already adapting to a hotter football environment, while supporters, broadcasters and host cities must also plan for dangerous conditions around stadiums. Heat has disrupted other sporting events, and football’s longer matches create a sustained physical challenge.
The same report links the tournament debate to a wider climate trend, placing recent global warming at roughly 1.26°C above pre-industrial levels and citing a rising warming rate. Those figures reinforce why extreme conditions are becoming a recurring competition issue rather than an isolated inconvenience.
The next major test will come when match schedules, cooling protocols and medical plans meet the reality of the tournament. If the heat intensifies, the teams that manage recovery best may gain an advantage before technical quality even decides the result.