By Chiara Fiorillo Brazil has issued an urgent health warning due to a heatwave that has seen temperatures reach 62.3C in the seaside city of Rio de Janeiro. The extremely hot temperature was recorded by the Rio Alert System at the Guaratiba station, on the city’s west side, at 9.55am, according to the City Council of the former Brazilian capital. The heat has left residents worried over the impact it can have on their health – and many rushed to the beach to cool off amid the searing heat. Beachgoer Eduardo Alves de Castro said: “It is worrying because we wonder how far this is going, where i…