Top News

A critical World Cup knockout encounter between France and Paraguay in Philadelphia this Saturday is expected to be among the hottest of the tournament, triggering serious concerns for the health and safety of players, tens of thousands of fans, and local residents.

The match coincides with a severe heatwave affecting the eastern and central United States, where heat indexes are forecast to soar between 100°F and 115°F (37.78°C to 46.11°C), as per the National Weather Service. Even nighttime temperatures are predicted to remain unusually high, offering minimal relief and possibly breaking long-standing records.

Fears about extreme heat have grown throughout the competition, particularly after French players used field sprinklers to cool off during their earlier game against Sweden in New Jersey, where temperatures reached 90°F (32.22°C).

Scientists have increasingly criticised FIFA’s heat safety protocols, describing them as “inadequate” and “unjustifiable”, even for athletes accustomed to hot climates. They have also warned that such conditions could make matches slower and less intense for spectators.

The worsening heat situation is closely tied to climate change. According to data from Berkeley Earth, the planet has warmed by roughly 1.26°F (0.7°C) since the last time the United States hosted the World Cup three decades ago.

This global temperature rise has increased the frequency and severity of heatwaves and other extreme weather events. On Friday, scientists from the World Weather Attribution group stated that the current humid heat engulfing parts of the US and Canada would have been “virtually impossible” without climate change.

This is not the first time excessive heat has disrupted the world’s biggest football event. The 2022 World Cup in Qatar had to be shifted from summer to winter due to extreme heat risks, and last year’s Club World Cup also witnessed soaring temperatures.

The global union representing professional footballers has repeatedly warned that extreme heat could become an even bigger challenge at this and future World Cups, recalling the 1994 World Cup match held in Orlando, Florida, where temperatures hit 110°F (43.33°C).

Heat poses a serious threat to athletes, affecting them both externally through environmental exposure and internally through body heat generated during intense physical activity.

This combination makes it much harder to cool down in hot and humid conditions, explained Bharat Venkat, director of the Heat Lab at the University of California, Los Angeles.

“When you’re exerting yourself on an extremely hot day, the likelihood of suffering from heat-related illness or even death increases sharply,” he warned. Extreme physical effort in such heat can cause fatigue, impaired performance, headaches, irritability, nausea, dizziness, muscle cramps, and dehydration — all symptoms of exertional heat illness.

Exertional heat stroke, which requires immediate medical care, remains the third leading cause of death among athletes.

Ryan Calsbeek, a professor of biological sciences at Dartmouth College, explained that when the wet bulb globe temperature (WBGT) — which measures temperature, humidity, cloud cover, and wind — exceeds about 95°F (35°C), the body loses its ability to cool itself effectively, and “the physiological mechanisms just break down.” He added that heat-induced confusion could impair a player’s judgement, possibly influencing the outcome of a match.

FIFA’s current heat safety policies include compulsory three-minute hydration breaks midway through each half. While these are meant to protect players and referees from heat-related illnesses, critics argue they interrupt the game’s rhythm and offer coaches tactical advantages.

At the same time, some experts believe the breaks are too brief to allow players to properly cool down and rehydrate in such extreme heat.

Although FIFA has reduced the number of matches played outdoors during peak heat hours and prioritised covered venues for warmer time slots, its policy to postpone matches only if the WBGT reaches 89.6°F (32°C) has faced widespread criticism.

Douglas Casa, CEO of the University of Connecticut’s Korey Stringer Institute, remarked that such conditions are “so extreme that in the military, at our basic training facilities in America, if it reaches 32°C, it’s a black flag situation and all training must be stopped immediately.”

With temperatures expected to exceed 100°F (37.78°C) for Saturday’s clash, the players’ union Fifpro and the American College of Sports Medicine have urged that matches be delayed once temperatures hit a safer threshold of 82.4°F (28°C).

Despite these challenges, teams are introducing various measures to cope with the heat. Guilherme Passos, a sports scientist with the Brazilian Football Federation, helps prepare Brazil’s national team for extreme weather conditions.

He has guided the players to acclimatise to the US heat, advising them to avoid training “at the hottest time of day” to sustain performance quality, and using saunas or hot baths for heat adaptation during tournaments.

Passos noted that during the 2014 World Cup in Brazil, players covered less ground and reduced high-speed sprints, focusing instead on technical and tactical precision. Calsbeek added that footballers’ unique mix of endurance, explosive speed, and rapid decision-making is all severely affected by high temperatures.

However, the risks extend beyond the pitch. Many football supporters, often drinking alcohol, will be watching World Cup matches in dangerous heat conditions.

In response, cities and stadiums have expanded shaded areas, cooling zones, and water access points, while deploying more medical teams at FIFA Fan Festivals and around venues. But Calsbeek cautioned, “People will be dehydrated, extremely excited, and unwilling to leave the match. Under these extreme temperatures, spectators are likely to suffer the consequences as well.”