Temperatures in Mandurah and Rockingham are set to hit the high 20C's this week.
The mercury is expected to reach 28C on Monday and 27C on Tuesday, Wednesday and Thursday.
Bureau of Meteorology's Jessica Lingard said warmer weather is due to the formation of a west coast trough.
"They bring down warm air from further north, so they drag that warm Pilbara air down the west coast into the southern parts and they bring us this beautiful bursts of warm temperatures," she said.
"We're only a couple of days away from the new month so definitely starting to see those warmer temperatures arrive.
"It feel a little different this month because it has been what has felt like a bit of a cooler month, it's taken a little bit of time for spring to really get going."
Temperatures will drop again on Friday to 23C, followed by 21C on Saturday and Sunday.
City of Rockingham records steep increase in animal cruelty complaints related to untreated medical conditions
Accused dirt bike hoons charged by Mandurah Police
Heavy rainfall, thunderstorms to lash Mandurah down to Busselton
Drivers escape serious injury after West Pinjarra, Baldivis crashes
Police investigate stabbing of two men at Warnbro home
Shark sighted in Dawesville Channel
City of Rockingham has highest number of households receiving rent relief
Man fined thousands for keeping dozens of undersize blue swimmer crabs caught off Coodanup Foreshore
2026 Mandurah Arts Festival to feature month-long program of performances, workshops
