The Bureau of Meteorology has issued a heatwave warning for parts of WA this week including Perth, Rockingham and Mandurah.
Perth is forecast to hit 38C on Monday and 37C on Tuesday through to Thursday.
It will be slightly cooler in Mandurah and Rockingham which is forecast to reach 33C on Monday, 32C on Tuesday and 34C on Wednesday and Thursday.
Bureau Meteorologist Jessica Lingard said a run of hot temperatures are quite unusual for this time of year.
"It's maybe not unusual to see a day or two of these warmer temperatures but to see an entire week this late into the month is perhaps a little unusual," she said.
"For around the Perth area it has been about 40 years since we last saw a week of really hot temperatures at the end of March and there are similar statistics for around the Mandurah and Rockingham areas."
Temperatures will drop slightly from Friday into the high-20s and low 30s.
PIC: Bureau of Meteorology
Bushfire readiness takes centre stage at City of Kwinana's free Summer Sounds festival
WA Open Golf Championship to tee off at Secret Harbour Golf Links
Halls Head named WA's most persistent storm damage hotspot
Four illegal e-bikes to be crushed after police crackdown in Halls Head, Falcon
Aboriginal jobs and careers expo to attract 1000 attendees in Rockingham
Firefighters attend Lakelands home after reports of thick smoke
WA Government to ban screen use for younger students as part of six-month trial
Singleton General Store shutdown over illicit tobacco, vape sales
Concerns for missing Bertram woman
