Scheduled to run from 11 June to 19 July across 16 venues spanning the United States, Canada and Mexico, the expanded 48-team competition now faces the prospect that roughly one in four of its 104 matches approximately 26 fixtures could unfold under conditions of significant heat stress, where wet bulb globe temperature (WBGT) readings reach or exceed 26°C, a threshold at which the human body’s ability to cool itself through sweating becomes markedly impaired amid high humidity, radiant heat and limited wind.
This analysis, produced by the World Weather Attribution group and drawing on detailed climate modelling, historical weather patterns and the tournament’s precise kick-off schedules, represents a near doubling of the heat risk compared with the United States-hosted tournament of 1994, when projections suggest only around 13 to 14 percent of matches would have encountered comparable dangers. Human-induced climate change has amplified both the frequency and intensity of extreme heat events across North America, turning what were once manageable summer variables into a structural challenge that no amount of short-term engineering can entirely eliminate, especially in open air stadiums. Even the showpiece final at MetLife Stadium in East Rutherford, New Jersey, on 19 July carries a roughly one-in-eight chance of hitting the 26°C WBGT mark, while venues in Miami stand out as particularly exposed, with several matches there described as near-certain to exceed the threshold and a small but real probability of pushing into far more dangerous territory above 28°C.
The physiological stakes could scarcely be higher for the elite athletes at the heart of the spectacle. During intense intermittent exercise such as football, core body temperatures can rise rapidly when environmental heat and humidity prevent effective evaporative cooling, leading to progressive decrements in physical performance, decision-making, concentration and, ultimately, heightened vulnerability to heat-related illnesses ranging from muscle cramps and exhaustion to the potentially fatal condition of exertional heat stroke. Referees, who often cover greater distances than players and may be less heat-acclimatised, face particular strain, as do substitutes on exposed benches and support staff operating under the same unforgiving sun. Fans, numbering in the tens of thousands per match and lacking the tailored medical protocols available to professionals, could encounter serious public health risks in fan zones, queues and sun-drenched stands, especially in cities where afternoon temperatures routinely climb during the peak North American summer.
In a detailed open letter sent to FIFA this week and signed by around 20 prominent figures, including Professor Hugh Montgomery OBE of University College London, Professor Douglas Casa of the Korey Stringer Institute, and other specialists in intensive care medicine, extreme environments physiology and climate science, the experts pull no punches. They describe FIFA’s existing heat mitigation guidelines, largely unchanged since 2015, as “inadequate and will place players at risk of heat injury at the 2026 men’s World Cup,” arguing that they are out of step with current evidence and “impossible to justify.” The letter calls for longer cooling breaks of at least six minutes when WBGT hits 26°C, clearer protocols for delaying or postponing matches above 28°C rather than leaving such decisions to on-the-day discretion, enhanced cooling infrastructure such as ice towels, shaded areas and misting systems, and greater investment in spectator support including widespread hydration stations. It also touches on the broader tension of FIFA’s sponsorship relationships with fossil fuel interests, which the signatories frame as a conflict with player welfare priorities.
At a press briefing, World Weather Attribution co-founder Friederike Otto, a climate science professor at Imperial College London, stated: “Players and fans face a much higher risk of gruelling heat and humidity at the 2026 World Cup compared to the 1994 tournament on the same continent.” Climate scientist Joyce Kimutai added context on the thresholds: “In the FIFA World Cup for 2026, we’re looking at roughly 25% of games to be played in conditions that will exceed 26 degrees (Celsius) ... What that means ... is that cooling breaks will be highly, highly, highly essential,” while noting that about five games could exceed 28°C, where “it’s really almost unsafe to play, and we should be thinking about postponement.”
FIFA, for its part, has emphasised the extensive preparations already under way, pointing to a tiered heat mitigation model supported by real-time meteorological monitoring, WBGT tracking and venue-specific risk assessments conducted well in advance. The organisation has mandated cooling breaks in every match, prioritised evening kick-offs where possible, allocated higher-risk fixtures to stadiums with roofs or air conditioning where feasible, and developed enhanced medical readiness including cooling stations and dedicated taskforces. A FIFA spokesperson said: “FIFA is committed to protecting the health and safety of players, referees, fans, volunteers and staff,” adding that measures include “three minute hydration breaks in each half of games, cooling infrastructure for fans and players, adapted work-rest cycles, and enhanced medical readiness that scale according to real-time conditions.” Officials stress that lessons have been learned from previous events and that scheduling has been designed with climate in mind.
This unfolding debate arrives at a moment when major international sporting events are increasingly forced to reckon with the realities of a changing climate. From Olympic marathons run in sweltering conditions to cricket matches interrupted by extreme weather, governing bodies across disciplines are confronting the limits of adaptation in outdoor environments. For football, whose World Cup remains the planet’s most watched sporting event, the 2026 edition serves as both a high-profile test case and a cautionary tale. The choice of a mid-summer window in the northern hemisphere was always likely to invite heat challenges in certain host regions, but accelerated global warming has narrowed safety margins and amplified the ethical and practical questions around player duty of care, fan safety and the sport’s wider environmental responsibilities. Some voices within the scientific community are beginning to suggest that future bids and schedules may need fundamental rethinking potentially shifting tournaments to cooler shoulder seasons or incorporating long-term climate projections more rigorously into host selection processes.
In the coming weeks and months, as national teams finalise their preparations and host cities ramp up their operational readiness, the conversation around heat will likely intensify. Squads may incorporate targeted heat acclimatisation camps into their training regimens, while local authorities are being pressed to expand cooling centres in public fan zones and ensure equitable access to water and shade. Broadcasters and commercial partners will be hoping for drama on the pitch rather than medical emergencies in the stands or on the touchline. Yet beneath the surface optimism lies a deeper truth: no tournament, no matter how meticulously planned, can fully insulate itself from the broader forces reshaping our planet’s weather patterns. The beautiful game, long celebrated for its universality and resilience, now finds itself confronting environmental limits that demand not only short-term tactical adjustments but longer-term strategic and ethical reflection from those who govern it. Whether FIFA’s measures hold firm under the glare of a North American summer or whether the scientists’ warnings manifest in moments of visible struggle will be scrutinised not just by millions of fans but by a growing chorus of experts who see sport as both a mirror and a microcosm of humanity’s relationship with a warming world.
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