The first notable burst of spring heat will sweep across south-eastern Australia early next week, sending temperatures into the mid- to high-20s in Sydney by Wednesday.

Meteorologists have been watching the warmth building in central Australia, with almost 33 degrees reached at Alice Springs today. Conditions will push that heat towards the southern states in coming days.

Beachy weather ahead - provided you stay out of the water. Credit:James Alcock

"Winds from the north will draw that heat from central Australia a bit closer [to Sydney] each day," Brett Dutschke, senior meteorologist with Weatherzone, said.

"There's a fair chance to get into the mid-20s and the high 20s in [Sydney's] western suburbs [next week]," he said.