Perth's summery weather is taking a break, just in time for the weekend, with rain on the radar and temperatures dipping into the low twenties on Saturday and Sunday.

While the mercury on Wednesday was set to reach 31 degrees and a hot 36 on Thursday, the Bureau of Meteorology said Perth residents could expect possible showers and storms for the rest of this week.

Perth sunny days are set for a quick change. Credit:WA Beer & Beef Festival

Duty forecaster Ricus Lombard said Perth's unpredictable weather was not unusual for this time of the year.

"We're in the season where we're switching over into summer so the weather does tend to vary a lot," he said.