A burst of heat from inland Australia is set to sweep across the country's south-east in coming days, challenging records for this late in the year, meteorologists said.

"Summer-like conditions will linger for several days," Kim Westcott, a meteorologist with Weatherzone, said.

The low-pressure trough will transport to the south-eastern states some of the warmth that has been baking north-western WA. That region set late-season Australian heat records of just shy of 46 degrees on both March 28 and 29.

According to Weatherzone, Adelaide, Melbourne, Canberra and Sydney may all be in line to set record warmth in coming days, including for the number of days in a row above various temperatures, for this late in the season.