Fijian rugby player Saimoni Vunilagi died from severe heatstroke after training in Fukuoka where temperatures reached 35C with humidity over 75%. His death highlights growing concerns as 2026 becomes the UK's hottest summer and extreme heatwaves affect global sports. Tennis players Jakub Mensik and Ekaterina Alexandrova collapsed at over 30C, while eight runners were hospitalized during a South Korean marathon at 29C.

Tour de France winner Tadej Pogacar called this year's heat 'dangerous', and Matthew Brennan questioned safety protocols after temperatures hit 40C at the Vuelta a Espana. Sports use Wet Bulb Globe Temperature (WBGT) monitoring, but experts like Dr Madeleine Orr demand standardized, universal heat policies akin to lightning protocols. She warns that heatwaves are now hotter than historical 'normal' levels, making past tolerance levels unreliable.

Growing calls for blanket rules across sports aim to provide consistent protection when temperatures reach critical thresholds.