Weather tracker: Heatwave sweeps South America as Argentina hits 43C

Weather warnings issued as worshippers brave temperatures to celebrate Catholic holy day

A heatwave has hit parts of central South America this week, coinciding with the Immaculate Conception pilgrimage attended by Catholic worshippers.

A sizzling 43.5C was recorded in Santiago del Estero, Argentina, on Wednesday, a day before the holy day. Weather warnings for extreme heat were issued by the Argentinian and the Paraguayan national meteorological services this week, as temperatures rose 10C above the seasonal norm for several days in many places.