Scientists have issued a direct warning to FIFA, stating that the current heat safety measures planned for the 2026 World Cup are insufficient. More than 20 scientists signed an open letter to FIFA, highlighting that existing precautions are outdated and do not align with current scientific evidence. According to climate research group World Weather Attribution, approximately a quarter of the 104 matches could be played in conditions exceeding the safety limits recommended by the players' union FIFPRO. This represents nearly double the heat risk observed during the 1994 World Cup on the same continent.
How dangerous could temperatures get at World Cup 2026 venues?
The numbers are stark. Research indicates that 14 of the 16 host stadiums across Canada, the United States, and Mexico could breach the critical 28°C wet bulb globe temperature threshold. In a hotter-than-average summer, as many as nine stadiums could exceed that limit for half the tournament, with four potentially reaching 32°C. Al Jazeera weather presenter Everton Fox noted that venues like Dallas, Houston, Miami, and several Mexican cities are likely to face sweltering conditions, with daytime averages expected around 28°C. In southern parts of the US and northern Mexico, temperatures can climb as high as 40°C. This situation is particularly concerning for FIFA, as only three stadiums—Dallas, Houston, and Atlanta—have air conditioning. Cities like Miami, Monterrey, Philadelphia, Kansas City, Boston, and New York, all without cooling systems, rank as the highest risk. Last year's Club World Cup in the US served as an early warning, with images of European players sprawled on pitches, dousing themselves with water, and wearing ice collars during training circulating widely on social media, raising concerns across the football world.
What do the heat conditions actually do to a player's body?
The science behind heat stress is genuinely concerning. Physical performance coach Raiyan Abbasi explained that while sweating is the body's natural way of regulating temperature, excessive heat disrupts that process, leading to dehydration, cramps, and mounting fatigue. Fox, a senior meteorologist with over three decades of experience, noted that humidity, solar radiation, and wind speed combine to make evaporation much harder, meaning the body cannot cool itself down quickly enough during 90 minutes of intense physical effort. Researchers at the University of Sydney's Heat and Health Research Centre explained that when players overheat, blood is redirected toward the skin to shed heat, reducing the supply available to working muscles and directly cutting into performance levels.
Are players from hotter countries better prepared for this?
There is a degree of natural adaptation, but it is not a decisive advantage. Abbasi acknowledged that athletes from nations with warmer climates may adjust slightly faster, but added that preparation ultimately levels the playing field. Teams that acclimatise properly and have structured performance and medical support can close that gap quickly. England captain Harry Kane pushed back on the speculation, insisting that heat "won't be a factor" after England beat New Zealand 1-0 in Tampa with temperatures exceeding 30°C. He pointed to England's deliberate acclimatisation programme as the reason for confidence. Abbasi backed that reasoning, noting that training in the heat can actually improve an athlete's physiological capacity over time.
What is FIFA actually doing and is it enough?
FIFA has introduced three-minute hydration breaks per half, delayed several kickoff times, and planned cooling infrastructure including misting systems and cooling buses for fans. However, Professor Douglas Casa from the University of Connecticut, one of the letter's signatories, said the breaks should be at least five to six minutes each to allow the body to properly recover. Scientists who signed the open letter described the current three-minute breaks as "too short to have a meaningful impact." Fox suggested that FIFA could have been smarter about fixture allocation, limiting matches in extreme-heat zones to northern US venues and Canada. UN Climate Change executive secretary Simon Stiell also weighed in, warning that the risk of dangerous heat has doubled since 1994 and that players and fans are now genuinely at risk. With the tournament already underway, the window to make structural changes has passed. The question now is whether FIFA's half-measures will hold up when the real heat arrives.
