Last month's early-season bursts of heat sent temperatures of some parts of eastern Australia a full 16 degrees above average, new analysis by the Bureau of Meteorology shows.

In a Special Climate Statement examining two pulses of extreme warmth that seared large areas of inland Australia from Victoria to Queensland, the bureau identified the many national and statewide September records that tumbled.

On September 23 alone, 62 per cent of NSW had its hottest September day on record. Credit:Daniel Munoz

During the first of those events, which affected NSW on September 23-24, all but three inland sites set record hot days for September.

On September 23 alone, 62 per cent of NSW had its hottest September day on record. A second heat burst set records in some northern parts of the state that had only been set a few days earlier.