Climate scientists are issuing a stark warning for the upcoming 2026 FIFA World Cup: extreme heat poses a significant risk to both players and spectators. According to a new analysis by the World Weather Attribution (WWA) organization, one in four matches is likely to be played under conditions that threaten health and safety.
As the tournament approaches, this data raises urgent questions about infrastructure, player welfare, and the tangible impact of climate change on global sporting events.
Beyond Thermometers: Measuring Real Heat Stress
The core of the warning lies not just in how hot it feels, but in how the body actually reacts to the environment. Researchers utilized the Wet Bulb Globe Temperature (WBGT) system rather than standard air temperature readings.
WBGT is a comprehensive metric that accounts for:
* Air temperature
* Humidity (which hinders evaporative cooling)
* Radiant heat (sun exposure)
* Wind speed
“A 30-degree Celsius day in dry, breezy conditions is very different from a 30-degree Celsius day with high humidity, strong sun, and little wind,” explains Chris Mullington, a senior lecturer at Imperial College London who contributed to the analysis.
By using WBGT, scientists can more accurately predict the physiological stress placed on the human body, providing a clearer picture of danger than a simple thermometer reading.
Critical Thresholds and High-Risk Venues
The International Federation of Professional Footballers’ Associations (FIFPRO) has established specific safety thresholds based on WBGT readings:
* 26°C WBGT: The point at which cooling measures and safety protocols must be implemented.
* 28°C WBGT: The level at which matches should be postponed to prevent severe heat stress.
The analysis predicts that 25% of the 104 scheduled matches will face WBGT levels of 26°C or higher. More alarmingly, five games could reach or exceed the critical 28°C threshold.
The Highest Risk Zones
While some venues, such as those in Dallas and Houston, benefit from stadium air conditioning, others remain vulnerable. The study identifies three high-risk open-air venues:
1. Miami: Six matches here have a “near certain” probability of exceeding the 26°C WBGT threshold.
2. Kansas City
3. East Rutherford, New Jersey: Host to the final on July 19.
The final match carries a 1-in-8 chance of hitting the 26°C danger zone and a 1-in-37 chance of reaching the critical 28°C mark. In Miami, dates in mid-July carry a 1-in-33 chance of exceeding the extreme 28°C threshold.
A Growing Crisis: Climate Change in Action
This is not an isolated prediction. Previous studies, including one published in the International Journal of Biometeorology in 2025, have warned that four host cities exceed the 28°C threshold more than half the time during summer months. The 2022 World Cup in Qatar was famously moved from June/July to November/December specifically to avoid lethal heat conditions.
The current analysis highlights a direct link to anthropogenic climate change. The United States last hosted the World Cup in 1994. Since then, average temperatures in host cities have risen by 0.7°C.
Joyce Kimutai, a research associate at Imperial College London, states that these worsening conditions are “confidently attributable to anthropogenic climate change.” The physiological heat-stress conditions associated with the tournament have become both more likely and more intense than in previous decades.
Protecting Players and Fans
The risks extend beyond elite athletes. While players are physically conditioned, they remain vulnerable to heat exhaustion, which can impair performance and endanger health. Mullington urges organizers to implement precautionary measures such as:
* Mandatory heat breaks
* Shaded areas and ice towels
* Increased medical monitoring
* Altered warm-up schedules
However, the general public faces unique vulnerabilities. Spectators are a medically diverse group, including the elderly, children, and individuals with pre-existing conditions like cardiovascular or metabolic diseases. Furthermore, fans endure additional heat exposure while traveling to venues and attending outdoor fan zones.
Organizers are being called to ensure sufficient medical staffing, easy access to water and shade, and robust transport planning to mitigate these risks.
Conclusion
The 2026 World Cup stands at the intersection of sport and climate reality. With nearly a quarter of matches facing dangerous heat levels, the tournament serves as a stark reminder of how climate change is reshaping global events. Without rigorous safety protocols and infrastructure investments, the health of players and fans remains at significant risk.
