Scientists have raised concern over the possible impact of extreme heat on players and fans during the 2026 FIFA World Cup, which will be jointly hosted by the United States, Canada, and Mexico. The experts warned that rising global temperatures could make some matches unsafe if urgent action is not taken.

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‎According to a report made available to pressmen, the warning came in an open letter signed by medical doctors, climate researchers, and sports scientists. The group urged FIFA to adopt stronger heat safety measures already recommended by FIFPRO, saying player welfare should be prioritised ahead of the tournament.

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‎The scientists said analysis showed that about one-quarter of matches could be played under dangerous heat conditions, based on the Wet Bulb Globe Temperature index, which measures heat stress. They added that some games may reach levels considered unsafe for professional football, raising concerns about player exhaustion, dehydration, and possible health emergencies.

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‎They also warned that beyond heat, the tournament could face additional climate risks such as thunderstorms and wildfire smoke, which may disrupt matches. However, FIFA said it plans to use real-time weather monitoring, adjust kick-off times, and apply safety protocols to reduce risks, adding that it remains committed to ensuring a safe and successful tournament.

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