New South Wales residents flocked to the beach again on Tuesday or took refuge in air conditioned buildings to escape temperatures in excess of 40 degrees.
However, not everyone was able to evade the heatwave, with paramedics treating 17 people for heat exposure in Sydney alone on Tuesday afternoon.
Sydney recorded a peak temperature of 42.5 degrees.
Many other patients had symptoms such as dizziness, nausea and vomiting that were attributable to the weather.
Moviegoers took advantage of reduced ticket prices on "cheap Tuesday".
AAP reports some Event and Greater Union cinemas in suburban areas eclipsed their Boxing Day sales by 11.30am (AEDT) on Tuesday.
Extra surf lifesavers volunteered their time at beaches that would not normally be patrolled on weekdays.
Surf Life Saving NSW Lifesaving manager Dean Storey said night patrols were being planned as temperatures would be as high as 30 degrees late at night and into Wednesday morning.
"Today they've been planning especially for an increase in potential activity after hours," he said.
"We'd urge people to plan their swim for patrol hours."
Train passengers were warned over loudspeaker systems in carriages and at stations to travel with water and notify staff if they felt unwell.
Bottled water was handed out at busy stations and misting fans were in operation at some platforms at Sydney CBD stations.