Updated 1:15pm: A colder change that spread northwards at the weekend means both Monday and Tuesday will be colder than normal in the east of both islands.

As WeatherWatch.co.nz said last week this cold air moving northwards will combine with warm rain caused by a northern low pressure system – this means heavy snow for the central/eastern ranges of the North Island.

The colder than average airflow goes right up the eastern side of both islands as far north as about Gisborne and East Cape. 

But the north of the North Island and west of the South Island look to continue the average to above average trend.

It’s a cold single digit day along eastern #Aotearoa today, but a warm airflow keeps the north closer to 20C!

Why the difference? A big low in the Tasman is pulling down a warm subtropical northerly, while a big high over southern #NZ dredges up a cold Southern Ocean southerly: pic.twitter.com/WZ1aPhjrGW

— WeatherWatch.co.nz (@WeatherWatchNZ) September 9, 2019

– WeatherWatch.co.nz