Canberrans who found themselves thankful Anzac Day had come and gone as they fired up their heaters this morning can take heart. Temperatures in the capital slipped to minus 1.8 degrees at 6:50am on Friday.

That's the coldest April low in four years and the frostiest temperature to hit Canberra since August last year.

Brisbane's temperature is set to dip to single figures overnight. Credit:Getty Images

Bureau of Meteorology spokesman David Barlow said it was the first "real cold snap" of the year.

"I told one of my colleagues earlier, the first one is always the one you feel the most," Mr Barlow said.