Napier and Masterton are hovering around 2C, with frosts expected across to Taumaranui.
Auckland and Kaitaia are at 6C while Whangarei has reached 7C.
Light frosts were also forecast in many inland sheltered parts of the South Island early this morning.
Invercargill appears to be one of the warmest spots in New Zealand this morning, waking to a balmy 12C before 6am, while Kaitaia in the far North is seeing just 6C this morning.
There are no severe weather warnings or road snowfall warnings in place, with most of New Zealand forecast to reach warmer temperatures in the high teens today.
Today is expected to see a fairly sunny day with a little cloud rolling through in the upper North Island, and possibly a light shower here and there, according to MetService meteorologist Angus Hines.
"The showers are going to be pretty few and far between."
Friday would see a similar pattern before developing northwesterlies bring a warm, dry weekend with temperatures above the average.
Today's weather
Whangārei
Partly cloudy and the chance of a shower. Southwesterly breezes. High 19C, Low 10C
Auckland
Cloudy periods and the odd shower. Southwesterlies. High 19C, Low 13C
Hamilton
Early frosts, then cloudy periods and the chance of a shower. Southwesterly breezes. High 18C, Low 9C
Tauranga
Cloudy periods. Southwesterlies. High 19C, Low 11C
New Plymouth
Cloudy periods and the chance of a shower. Southeasterlies turning southwesterly this morning. High 18C, Low 13C
Napier
Fine with early frosts. Northwesterlies developing in the evening. High 20C, Low 9C
Whanganui
Cloudy periods and the chance of a shower. Northeasterlies turning fresh westerly this morning. High 18C, Low 13C
Wellington
Fine with northerlies. High 16C, Low 12C
Nelson
Fine. Southwesterlies. High 18C, Low 12C
Christchurch
Fine. Northwesterlies developing in the afternoon. High 19C, Low 7C
Dunedin
Partly cloudy. A few spots of rain at night as northwesterlies change southwesterly. High 18C, Low 10C