Perth has shivered through a string of cold nights and mornings this month, with temperatures dropping as low as 1.9C.
Weather Bureau duty forecaster Neil Bennett said yesterday that Perth had experienced eight nights of below 5C this month.
"The reason for it is an area of high pressure over the State, which generally brings clear skies and light winds," he said.
Mr Bennett said though the record of 13 June nights below 5C set in 2006 would probably not be beaten, the average of 5.9 days below 5C had been surpassed.
The bureau is predicting showers today in Perth's coastal districts, with conditions expected to clear by tomorrow morning.
Mr Bennett said rainfall would likely increase temperatures overnight across Perth. "Certainly for the next week we're expecting to see temperatures up above the 5C mark," he said.
Overnight minimum temperatures for Monday, Tuesday and yesterday were 2.1C, 2.8C and 2.7C. Perth had a similar cold snap in the middle of the month, with five days below 5C between June 11 and June 16. The record for consecutive days below 5C in June was seven days - in 2008 and in 2010.
Cold temperatures are expected to return at the weekend, with a high likelihood of a chilly morning on Sunday.