Sydney, Melbourne, Brisbane weather: Brutal heatwave to strike Sydney today after Melbourne was hit by 40C temperatures

An intense heatwave is set to devastate large parts of Sydney, hours after the mercury in Victoria rose to almost 50 degrees Celsius for the first time since Australia’s Black Summer.

Weatherzone Senior Meteorologist Thomas Hough said temperatures will rise to the low 40s in Sydney’s western suburbs and 33 degrees Celsius in the CBD on Tuesday.

Temperatures are expected to rise to 42 degrees Celsius in Penrith, 42 degrees Celsius in Richmond, 40 degrees Celsius in Liverpool and Blacktown and 38 degrees Celsius in Parramatta.

For the first time since the Black Summer of 2019-2020, Victoria’s mercury peaked at 47.1 degrees Celsius on Monday in the small town of Walpeup in Victoria’s northwest.

It was also sweltering in Melbourne when temperatures reached 38.1 degrees Celsius just before 3 p.m.

However, forecasters say much-needed relief is on the way.

“A southerly change is expected to occur in Sydney between 6pm and 8pm, causing temperatures to be significantly cooler on Wednesday, with a forecast high for the city in the mid-20s,” Mr Hough told Daily Mail Australia.

‘The heat is caused by hot northerly winds from inland Australia moving across the south-east of the country, ahead of a cold front and approaching a southerly change.’

Temperatures will rise to the low 40s in Sydney’s western suburbs and low 30s in the city on Tuesday, as a mass of hot air lingers over NSW (pictured, swimmers at Bondi Beach)

The sweltering temperatures will put additional strain on the state's power grid as air conditioning systems kick in this afternoon (see photo of a heat map from Monday)

The sweltering temperatures will put additional strain on the state’s power grid as air conditioning systems kick in this afternoon (see photo of a heat map from Monday)

The sweltering temperatures will put extra strain on the state’s power grid as air conditioning systems kick in this afternoon.

More than 2,500 homes and businesses are without power in Bankstown, Sydney’s west, as temperatures soar in the city.

Ausgrid said repairs for the outage are expected to be completed by around 12.30pm.

Bankstown was already sweltering at 33 degrees Celsius at 11am on Tuesday.

It comes after Australia’s east coast saw its highest electricity demand since January 2020 on Monday.

As NSW sizzles under heatwave conditions, south-east Queensland has been ravaged by a slow-moving rain bomb, dumping more than 140mm of rain on Brisbane, the Sunshine Coast and Moreton Bay on Monday evening.

Kallangur, in the Moreton Bay region, was hit by 70mm of rain in just one hour.

Western Sydney residents will be looking to cool off today as the mercury tops 42 degrees Celsius

Western Sydney residents will be looking to cool off today as the mercury tops 42 degrees Celsius

Brisbane

Wednesday: Showers. Possible thunderstorms. Min 23C Max 29C.

Thursday: Cloudy. Min 21C Max 28C.

Friday: Partly cloudy. Min 19C Max 29C.

Sydney

Wednesday: Shower or two. Windy. Min 19C Max 24C.

Thursday: Partly cloudy. Min 18C Max 24C.

Friday: Mostly sunny. Min. 17C Max. 25C.

Canberra

Wednesday: Clearing of the clouds. Min 13C Max 28C.

Thursday: Sunny. Min. 8C Max. 29C.

Friday: Sunny. Min 9C Max 32C.

Melbourne

Wednesday: Partly cloudy. Min 14C Max 22C.

Thursday: Sunny. Min 13C Max 27C.

Friday: Sunny. Min 15C Max 31C.

Penrith Beach will be packed on Tuesday as residents in Sydney's west try to escape the heat

Penrith Beach will be packed on Tuesday as residents in Sydney’s west try to escape the heat

Hobart

Wednesday: Partly cloudy. Min. 11C Max. 21C.

Thursday: Partly cloudy. Min 10C Max 20C.

Friday: Mostly sunny. Min 11C Max 23C.

Adelaide

Wednesday: Sunny. Min 14C Max 30C.

Thursday: Sunny. Min 15C Max 33C.

Friday: Sunny. Min 17C Max 32C.

Perth

Wednesday: Sunny. Min 19C Max 30C.

Thursday: Sunny. Min 16C Max 30C.

Friday: Sunny. Min 16C Max 33C.

Darwin

Wednesday: Showers. Possible thunderstorms. Min 27C Max 35C.

Thursday: Showers. Possible thunderstorms. Min 26C Max 33C.

Friday: Shower or two. Possible thunderstorms. Min 27C Max 34C.