Perth Airport had climbed to 42.7C before midday on Friday and the city reached 40.4, while the Swan Valley and Pearce hit 43.5C and 43.6 respectively, the Bureau of Meteorology said.
In the Mid West, Geraldton residents baked as the mercury rose to 46.6C just after 11am and Morawa recorded 43.1C.
The Wheatbelt is also copping it, with Cunderdin soaring to 43.6C by 11.30am WST and Dalwallinu 42.7C about the same time.
It follows two days of extreme temperatures that saw the Swan Valley in Perth sizzle with a 45.1C top temperature on Thursday, beating its previous record for the hottest maximum of 44.5C in February 2022.
Nearby Pearce reached 45.2C, just 0.5C below its February record of 45.7C in 1997 and only 0.8C away from its hottest day in January 1977.
Geraldton Airport recorded 46.5C on Thursday, a tad below its record temperature of 47.3C in December 2021.
The temperature reached 41.9C in Perth city on Wednesday and in the eastern suburbs, the maximum climbed to 43.2C at the airport and 41.5C in the hills at Bickley.
Relief is on the way, with the weather bureau predicting the heatwave conditions to end in the south of the state.
Perth is forecast to reach a maximum of 31C on Saturday and 26C on Sunday.
Geraldton will also be cooler, with weekend maximums of 30C and 27C likely.
Conditions will remain seasonally hot in the north of the state.
Marble Bar is forecast to reach 47C on Saturday and 46C on Sunday, while Broome is forecast to hit 34C on both days.
6°C