‘It’s impossible’: Chelsea battles extreme heat ahead of Club World Cup showdown in Philadelphia

With a vital Club World Cup match on the horizon, Chelsea was forced to cut its training session short on Monday due to blistering heat in Philadelphia. As the city bakes under a record-breaking heat dome sweeping across the U.S., players and managers alike are grappling with how to perform—and stay safe—under unforgiving conditions.

Chelsea shortens training as heat overwhelms Philadelphia

On the eve of a critical group-stage match against Tunisia’s ES Tunis in the FIFA Club World Cup, Chelsea found itself facing an unexpected adversary: the weather. Temperatures soared to 99°F (37.2°C), with the heat index—a measurement of how hot it actually feels—climbing to a suffocating 110°F (43.3°C). The conditions were so severe that manager Enzo Maresca made the call to drastically reduce training at Subaru Park, home of the Philadelphia Union.

“It is almost impossible to train or to make a session because of the weather,” Maresca told reporters. “We are just trying to save energy for the game. This morning’s session was very, very short—just focused on planning for tomorrow.” Chelsea adapted by confining practice to shaded parts of the stadium and using water-spraying fans to cool down the pitch. Despite their efforts, Maresca made it clear the heat had imposed strict limits. “It’s impossible to do a normal session,” he said.

Record-breaking heat grips the East Coast

Philadelphia is currently sweltering under one of the most intense heat waves in recent years, part of a broader heat dome hovering over much of the United States. Cities across the Midwest, mid-Atlantic, and Northeast are experiencing temperatures 15 degrees above seasonal averages, with little relief expected until late in the week.

The National Weather Service has issued a Level 4 “extreme heat risk” warning—the highest possible—for much of the region. Philadelphia, in particular, is expected to break its century-old temperature record with highs reaching 101°F (38.3°C), eclipsing the 99°F set in 1923.

According to a 2023 study, heat remains the deadliest form of extreme weather in the U.S., responsible for more than 800 deaths annually since 1999. For professional athletes competing in physically demanding tournaments, the risks are magnified.

Tuesday’s kickoff at Lincoln Financial Field is scheduled for 9 p.m. ET, but forecasts still predict a temperature of 98°F (36.7°C) with a heat index over 105°F (40.6°C) at that time. Chelsea needs only a draw to secure a place in the tournament’s round of 16, but they’ll have to fight the elements just as hard as their opponents.

FIFA’s response and broader sporting impact

In response to the severe weather, FIFA issued a statement affirming that the “health of everyone involved in football” remains their top priority. The governing body has activated several heat management protocols, including the deployment of medical officers, additional water breaks, and even allowing fans to bring personal water bottles into venues.

“FIFA’s medical experts have been in regular contact with the clubs participating in the FIFA Club World Cup 2025 to address heat management and acclimatization,” the statement read. FIFA also noted that extra rest days, increased substitutions during extra time, and medical monitoring would continue throughout the tournament.

Still, the extreme conditions have already taken a visible toll on players. Atlético Madrid midfielder Marcos Llorente described the experience of playing in the heat as “unbelievable.” During a recent match against Paris Saint-Germain, he said, “It’s impossible. The heat is terrible. My toenails were hurting—I couldn’t stop and accelerate.”

Beyond soccer, other major sports have also been disrupted. In Major League Baseball, Cincinnati Reds shortstop Elly De La Cruz vomited in the outfield due to the heat, and Seattle Mariners reliever Trent Thornton required treatment for heat exhaustion. Mariners first baseman Donovan Solano, who played through intense heat at Wrigley Field, summed it up: “I don’t need to move, I don’t move. Because everybody wasn’t prepared for this weather.”

Managing performance under punishing conditions

For Chelsea, the combination of oppressive heat and tournament pressure poses unique challenges. Not only must they adapt their physical routines, but they must also carefully manage hydration, recovery, and mental focus under hostile conditions.

Maresca emphasized the importance of energy conservation and strategic thinking. “We’re here and trying to do our best,” he said. “We will try to win tomorrow.” With increasing temperatures linked to global climate change, instances like this are likely to become more common. Athletic organizations are now being forced to develop sustainable strategies—not only to safeguard players’ health but to ensure the continuity of elite sports competitions in an era of escalating environmental stress.

As the Club World Cup continues under a punishing sun, Chelsea’s cautious but determined approach may serve as a model for other teams navigating this new normal. But whether football can adapt fast enough to changing climates remains a question as urgent as any title match.

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