Heat records around Australia have continued to tumble this weekend, with the ACT reaching its highest-ever recorded temperature and Penrith topping 48.9 degrees Celsius on Saturday.

Key points: The ACT reached its highest-ever recorded temperature today, topping 44 degrees Celsius at Canberra airport

The ACT reached its highest-ever recorded temperature today, topping 44 degrees Celsius at Canberra airport Penrith also toppled its record high, at 48.9C this afternoon

Penrith also toppled its record high, at 48.9C this afternoon Those in Greater NSW are also sweltering through immense heat

Canberra Airport reached 44 degrees Celsius, which surpassed the ACT's previous record at the Old Acton Station, which reached 42.8 degrees Celsius in January 1939.

There are no active fires in the ACT but conditions on fire grounds in surrounding areas in New South Wales are deteriorating, as hot and gusty north westerly winds ramp up.

Meanwhile, Penrith in Western Sydney reached 48.9C, a high that surpassed the previous record 47.8 degrees Celsius set at Richmond in 1939.

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Those in Greater NSW are also sweltering through a heatwave, with temperatures as high as 46C in many regional airports.

At 4:00pm, Horsley Park reached 45.5C and Bankstown sweated through 46.1C.

Two fires are skirting Bankstown, including an out-of-control blaze close to Bankstown Airport.

Elsewhere, Mount Seaview on the Mid North Coast hit 40.2C while Maitland Airport in the Hunter is at 44C.

The Gospers Mountain mega blaze, which has been burning for over two months, is 36 kilometres away from Maitland Airport.

Temperatures in the Central Tablelands have been hovering near the 40s, with Mudgee hitting 40.4C and Bathurst Airport at 40.9C.

In the Riverina, Narrandera Airport is at 46.7C while Wagga Wagga is clocking 45.4C.