A large area of outback heat that is set to increase over the weekend and days after could cause record high temperatures across three states.

Weatherzone reports that South Australia, Queensland, NSW, and the ACT could all break their heat records for October, with temperatures expected to reach the mid-40s.

Over the past week, Western Australia's north-west saw a large buildup of hot air that is now spreading across the country.

The heat is causing warmer temperatures in outback areas earlier than usual.

Parts of Australia's south-east are also set to face a brief hit of premature heat later this weekend and into next week.

South Australia

There is a chance that South Australia's previous October heat record of 45.4 degrees at Oodnadatta could be broken, with temperatures of 43

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