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Southeast to swelter through Christmas

AAP logoAAP 24/12/2016 Rebekah Ison

Parts of the country's southeast will swelter on Christmas Day, with humidity in the region expected to approach or exceed December records.

A severe heatwave is affecting parts of NSW, Victoria, South Australia and Tasmania, with the average Christmas night temperatures for Tasmania and Victoria forecast to be the warmest on record.

Adelaide is expected to experience its warmest Christmas Day since 1945, with a 40C maximum.

Melbourne's forecast 35C maximum would be the hottest since 1998.

Bureau of Meteorology senior meteorologist Jenny Sturrock says a trough over Western Australia has contributed to high humidity levels in the country's southeast, with "noticeably muggy" conditions unusual for the time of year.

Ex-tropical cyclone Yvette is expected to cross WA's Kimberley Coast on Christmas Day as a low pressure system before dying off around Boxing Day.

"At this stage (it's) unlikely to develop into a cyclone again," Ms Sturrock said

"But it still could get quite strong winds.... and also some heavy rainfall adding to the already increased falls that region has seen."

Hobart will experience a max of 26C, which is more than 5C above average.

Canberra (31C max) and Brisbane (28C max) may experience showers, while a possible storm is forecast in Darwin where the temperature is expected to reach 33C.

Sydney is expected to reach a maximum of 27C.

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