Perth is on track to have the coldest month on record.

This morning the temperature dipped to 0.4 degrees at 6.24am - and at 8am, it was still only three degrees.

That is the coldest day since July 5, 2010 when 0.3 degrees was recorded in the city.

Bureau of Meteorology senior forecaster Matt Boterhoven told WAtoday.com.au that today's minimum took this month's tally of cold mornings to 15.

The bureau counts temperatures of less than five degrees as cold mornings.