When the world descends upon North America for the 2026 FIFA World Cup, the primary challenge for the athletes may not be the opposition on the pitch, but the air around them. Spanning 16 cities across the United States, Canada, and Mexico, the tournament’s massive geographic footprint creates a volatile atmospheric lottery for players and fans alike.
While coastal cities in Canada and the Pacific Northwest are expected to remain mild, the inland south and the Mexican host cities are bracing for a different reality. A recent analysis by World Weather Attribution (WWA) indicates that climate change is a massive player at FIFA World Cup 2026, significantly increasing the likelihood of dangerous “humid heat” events that could threaten player safety and disrupt the tournament schedule.
The study reveals a stark contrast between the current climate and that of 1994, the last time the United States hosted the World Cup. Due to anthropogenic climate change, the frequency and intensity of extreme heat stress have risen, making the 2026 event far more susceptible to hazardous conditions than its predecessor three decades ago.
The Invisible Opponent: Understanding Humid Heat
To understand the risk, sports scientists look beyond the standard thermometer. They use the Wet Bulb Globe Temperature (WBGT), a composite index that combines air temperature, humidity, radiant heat from sunlight, and wind speed. Unlike a simple temperature reading, WBGT measures the body’s actual ability to cool itself through sweating.
When humidity is high, sweat cannot evaporate efficiently, causing the internal body temperature to rise dangerously. This “humid heat” is what makes a 30°C day in Miami feel significantly more punishing than a 30°C day in a dry climate. For professional athletes performing high-intensity exercise, this thermal strain can lead to rapid performance degradation, serious illness, and heat stroke.
The global players’ union, FIFPRO, provides clear safety benchmarks: when WBGT reaches 26°C, heat strain becomes a real risk, and mandatory cooling breaks are recommended. At 28°C, conditions are deemed unsafe for play, and FIFPRO advises the postponement of the match.
However, a critical gap exists between player advocacy and governing body rules. Current FIFA regulations for the World Cup generally only consider postponement when WBGT levels exceed 32°C—a threshold significantly higher and more dangerous than the guidelines suggested by the players’ own union.
A Warmer Game: Comparing 1994 to 2026
The WWA attribution analysis shows that the environment has shifted meaningfully since the 1994 tournament. By combining observational data with climate models, researchers found that the increase in extreme WBGT conditions is confidently attributable to human-induced climate change.
The data suggests that the number of games expected to take place in conditions of at least 26°C WBGT has risen from 21.3 in 1994 to 25.6 for the 2026 tournament. More concerning is the impact on venues without integrated cooling systems. the number of games expected to hit this threshold in non-cooled stadiums has increased from 6.1 to 9.3.
For the more severe 28°C threshold—the point where play is considered unsafe—the impact of warming is even more pronounced. Five games are now expected to face these conditions in 2026, compared to only three in 1994. Even the likelihood of extreme 30°C WBGT events, while still relatively low, has nearly doubled since the last U.S.-hosted tournament.
Figure 1. 1990-2020 climatology of daily maximum Wet Bulb Globe Temperature (WBGT; left panel) and daily maximum air temperature (right panel) across North America during the 2026 FIFA World Cup period (11 June–19 July). White circles indicate the locations of the host stadiums participating in the tournament.
Mapping the Risk Zones
The risk is not distributed evenly. The study identifies several “danger zones” where the likelihood of exceeding safety thresholds is highest. Stadiums in Miami, Kansas City, Philadelphia, Dallas, and Houston are most exposed to extreme humid heat, with some locations showing a “return period” of one year for dangerously hot 28°C WBGT events—meaning such conditions are almost certain to occur during the tournament window.
Even late-afternoon kickoffs do not guarantee safety. For instance, the match between the Netherlands and Tunisia, scheduled for 18:00 local time in Kansas City, carries a 7% chance of exceeding the 28°C threshold that FIFPRO suggests should trigger a postponement.
While air-conditioned stadiums can protect the players once they are inside the venue, the risks extend far beyond the touchline. Fans gathering at public viewing events, outdoor celebrations, and transit hubs will be fully exposed to these elevated temperatures, increasing the risk of heat-related emergencies for spectators.
| Risk Metric (WBGT) | Expected Games (1994) | Expected Games (2026) | Trend |
|---|---|---|---|
| ≥ 26°C (Cooling Needed) | 21.3 | 25.6 | Increasing |
| ≥ 26°C (No Stadium Cooling) | 6.1 | 9.3 | Significant Increase |
| ≥ 28°C (Unsafe for Play) | 3.0 | 5.0 | Increasing |
| ≥ 30°C (Severe Heat) | Low | Nearly Double 1994 | Increasing |
Figure 2: Overview of the likelihoods of all games in a 2026 climate and a 1994 climate.
The Future of Summer Football
The WWA report warns that What we have is not a static problem. In a world with 2°C of global warming—approximately 0.7°C warmer than today—climate models simulate further increases in hazardous heat across nearly all host locations. Without substantial adaptation, such as widespread cooling infrastructure and a shift in scheduling, staging major tournaments during the Northern Hemisphere summer will become increasingly dangerous.
FIFA has already announced the implementation of three-minute breaks during each half of every game during the 2026 World Cup, regardless of the conditions. While a step in the right direction, the data suggests that adaptation alone may not be enough. The long-term viability of the sport’s traditional calendar depends on broader mitigation efforts to reduce the burning of fossil fuels and slow the rise of global temperatures.
As the tournament approaches, the focus will likely shift toward how FIFA aligns its official postponement protocols with the physiological realities highlighted by FIFPRO and the WWA study.
The next major checkpoint for tournament preparations will be the finalization of match schedules and the unveiling of specific venue-based heat mitigation plans as the 2026 kickoff draws closer.
Do you think FIFA should adopt the FIFPRO safety thresholds for the 2026 World Cup? Share your thoughts in the comments below.
Disclaimer: This article provides information on environmental heat stress based on climatological studies and is intended for informational purposes only. It does not constitute medical advice.
