Sydney marathon runners hospitalised after event hit by spring heat

Temperatures reached 32C in parts of Sydney on Sunday afternoon .

Temperatures peaked at 29.6C at the Bureau of Meteorology’s Sydney Harbour observation site.

At 7.30am , just after the marathon began, temperatures were already 20C.

More than 17,000 runners took part in the 42km race, with NSW Ambulance paramedics providing treatment to 40 people.