World Cup Heat Crisis: Scientists Warn 14 of 16 Stadiums Face Dangerous Temperatures

As of May 17, climate scientists and sports medicine experts were publicly warning that FIFA's heat safety measures might prove inadequate for a summer tournament across North America.

One frequently cited analysis argued that 14 of 16 host stadium environments could be considered "high risk" for extreme heat. Houston, Miami, and Monterrey were repeatedly highlighted because of their combinations of temperature, humidity, and environmental exposure.

Critics argued that FIFA's protocol, including cooling breaks and suspension thresholds, may not fully reflect the geographic and climate range of a 39-day tournament across North America. Scientists and player-welfare advocates have called for lower intervention thresholds and more flexible scheduling, while organizers still face commercial pressure around kickoff windows.