A man has died after collapsing on a golf course in Woolooware.
Paramedics had done everything they could to save the man in his 60s at the Woolooware Golf Club, Chief Superintendent Alan Morrison said.
"It appears the man collapsed in the heat just after lunchtime, at around 12.48 pm and went into cardiac arrest.
"This is a terrible tragedy."
So far today paramedics have responded to 55 heat-related call-outs.
Chief Superintendent Morrison said this number was a major cause for concern.
"We really want the public to stay inside, drink water and avoid physical activity," he said.
"This advice is especially important for elderly people.
"These kinds of conditions can have very serious health effects."
Woolooware Golf Club took to its Facebook page after the incident.
‘’Our thoughts and prayers are with all of those involved with this tragedy today,’’ the post said.
‘’Please stay safe and hydrated this summer, and look out for your mates if they're feeling unwell.’’
NSW Ambulance had 110 heat-related call-outs yesterday. Senior Assistant Commissioner and Executive Director of Clinical Services, Allan Loudfoot says they expect the number of call-outs today to be even higher.
"We expect that figure to be exceeded today," he says, adding the public needs to be mindful of safety during extreme heat.
"These kinds of temperatures can be deadly for vulnerable people.
"It is a very hot day and people need to beware of sun stroke, dehydration, excessive heat exposure following a scorching 48 hours in Sydney, particularly in Sydney's west."
Particularly concerned for the elderly or physically frail, the Senior Assistant Commissioner said people should avoid strenuous activity, stay indoors if possible and drink plenty of water.
"Today has seen an early spike in temperatures, so stay out of the sun. If you must go out, try and wear cool, loose-fitting clothing and a hat," he says.
"People need to drink more water than they usually would. Try drinking small amounts of water and ensure you have enough water to last the day - it can mean the difference between remaining healthy and ending up in hospital."