How hot conditions could impact the World Cup

The 2026 World Cup will take place in over a dozen North American cities during peak summer heat, with temperatures in some host locations potentially exceeding 80–99°F (27–37°C) and humidity elevating the heat index. According to Climate Central, extremely hot days in June and July have tripled since the 1986 and 1994 tournaments, posing risks to players and spectators. Monterrey, Mexico; Arlington, Texas; and Houston are identified as highest-risk sites, with hourly UTCI values surpassing 49.5°C (121.1°F) in some cases. While stadiums like AT&T Stadium in Arlington and NRG Stadium in Houston are air-conditioned, open-air venues such as Estadio Monterrey lack climate control for spectators. Hard Rock Stadium in Miami, though partially covered, is not fully air-conditioned. Experts note that air conditioning mitigates overheating risks for attendees but warn that training facilities—most of which are not air-conditioned—remain a concern. Heat and humidity can impair athletic performance by causing cardiovascular strain, hyperthermia, and dehydration, reducing sprint speed, cognitive function, and recovery time between games. A 2024 study highlighted these dangers, emphasizing the need for acclimatization strategies to preserve player performance. Researchers suggest that gradual adaptation to local climate conditions could help athletes maintain competitive levels. Doug Casa, CEO of the University of Connecticut’s Korey Stringer Institute, warns that exertional heat stroke remains a risk, particularly in unregulated training environments. The institute was founded following the 2001 death of Minnesota Vikings lineman Korey Stringer from heat-related complications. Experts recommend leveraging sports science to prepare athletes for extreme conditions, though rapid climate adjustments may still pose challenges. Players will need to adapt quickly to varying heat levels across host cities, which could affect both physical and mental performance. The World Cup organizers will likely implement measures to address heat risks, though the scale of the challenge—spanning multiple countries and climates—remains unprecedented in tournament history.