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Cool change ahead of heated comeback

AAP logoAAP 11/01/2017

The Bureau of Meteorology predicts a milder 27C for coastal parts of Sydney to and 30C in the west for Thursday © AAP Image/Mick Tsikas The Bureau of Meteorology predicts a milder 27C for coastal parts of Sydney to and 30C in the west for Thursday A cool change is expected across Sydney and southern NSW on Thursday but by Friday it's forecast to heat up again with many parts of the state due to cop temperatures of more than 40C.

Bourke, on the fringe of a desert in northwest NSW, was the hottest place on Wednesday with the mercury hitting 46C, and it's not expected to drop below 29C throughout the night.

And the heat is likely to remain in northern and inland NSW, with many areas bracing for another day of 40C and above on Thursday.

But for those in Sydney and the state's south some reprieve is predicted overnight Wednesday ahead of a much cooler day, after a scorcher during which the western suburbs sweltered in temperatures up to 42C, as was recorded at Penrith.

The Bureau of Meteorology predicts a milder 27C for coastal parts of Sydney to and 30C in the west for Thursday.

That could jump back as high as 40C on Friday as the lingering heatwave returns and sets in for several more days.

The high temperatures are forecast to remain until mid next week, a BOM spokesman told AAP.

During Wednesday's heat, about 23,000 homes and business across Sydney lost power.

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