Sydney Morning Herald | Records topple, city stumbles as gauge hits 46C The Australian Video; Video; Video; Image. Cooler weather helps NSW firefighters. Cooler weather has helped NSW firefighters strengthen containment lines around bush and grassfires. Sydney sweats on record hottest day. Sydney has recorded its hottest day in history ... City sizzles in record heat 182 cases of heat stroke: Ambos Northern District swelters in Sydney's hottest day |