The mercury climbed above 40 degrees for a fifth day in February just before 1pm on Thursday.
The record for the most number of days above 40 degrees days in February was four,reached in 1985 and 2016. That record could even be doubled by the end of the month.
Bureau of Meteorology duty forecaster Joey Rawson said the continuing heatwave conditions were the result of three troughs forming one after another.
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“Today we have an offshore trough along the west coast,so we’re getting winds that are dragging that hot air mass from inland WA,” he said.
“We’ve got the north-east winds to arrive in really hot conditions that have just been building up it feels like all summer.”
There was a chance of an afternoon thunderstorm north of Perth with little to no rainfall.