Temperatures soar to 30C in Sydney as thousands prepare to flock to beaches ...

Sydneysiders are flocking to the beach as temperatures soar - but are warned to brace for smoke as authorities conduct hazard reduction burns.

The mercury will hit 30C in most suburbs on Thursday, before a southerly change blows the first real taste of summer away.

Weatherzone meterologist Brett Dutschke said the warm weather is 'not unusual' for this time of year, despite being well above the September average.  

'In spring we always get a taste of summer but it's usually brief,' he said. 

'But having said that, the city's 30C forecast is about 10C above average for this time of the year.

Pictured: Map of Australia shows heat across the country at about midday on Thursday

Pictured: Map of Australia shows heat across the country at about midday on Thursday

Sydneysiders are flocking to the beach as temperatures soar to 30C. Pictured: A woman walks along the sand at Bondi Beach on Thursday

Sydneysiders are flocking to the beach as temperatures soar to 30C. Pictured: A woman walks along the sand at Bondi Beach on Thursday

A couple make the most of warm weather on Thursday at Sydney's Bondi Beach

A couple make the most of warm weather on Thursday at Sydney's Bondi Beach

'In the western suburbs its about 7C above average for this time of year.'

According to the Bureau of Meteorology, the average maximum temperature for September - recorded at Observatory Hill in Sydney's CBD - is 20.1C.  

Mr Dutschke said the 30C forecast was widespread across the city but the beaches would linger around the 26C, 27C mark. 

He explained the heat has been pulled to the east coast from the interior.  

'Today we've got winds blowing from the north-west and it's drawing some heat from the interior where it has been building for the past few days,' he said.  

'With north-westerly winds, it's drawing that heat closer to the east coast.'

But the summer-like conditions are expected to come to a 'rapid end' with a southerly wind change in the late afternoon. 

Mr Dutschke said temperatures should drop 'by about 10C in an hour or two'. 

Weatherzone meterologist Brett Dutschke said the warm weather is 'not unusual' for this time of year, despite being well above the month's average. 'In spring we always get a taste of summer but it's usually brief,' he told Daily Mail Australia. Pictured: Two women at Bondi Beach

Weatherzone meterologist Brett Dutschke said the warm weather is 'not unusual' for this time of year, despite being well above the month's average. 'In spring we always get a taste of summer but it's usually brief,' he told Daily Mail Australia. Pictured: Two women at Bondi Beach

Crowds begin to gather at Bondi Beach in Sydney's eastern suburbs on Thursday morning

Crowds begin to gather at Bondi Beach in Sydney's eastern suburbs on Thursday morning

A man walks back to his belongings on Bondi Beach after cooling down in the water on Thursday

A man walks back to his belongings on Bondi Beach after cooling down in the water on Thursday

Mr Dutschke said the 30C forecast was widespread across the city but the beaches would linger around the 26C, 27C mark. Pictured: Beachgoers at Bondi

Mr Dutschke said the 30C forecast was widespread across the city but the beaches would linger around the 26C, 27C mark. Pictured: Beachgoers at Bondi

'By the time we get to 6pm, most of Sydney will be colder than 20C, cloudy and later this evening, showers are possible,' he said. 

The southerly change will bring 'strong' winds of about 30 to 40km/h on the coast. 

'Strong warning for coastal waters in relation to that southerly change and also on the harbour. It will get quite bumpy as well,'

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