Heavy rain and wind watches have been issued for some exposed areas in its path.
There is a chance of significant heavy rain in the Tararua Range for a time today, and northwesterlies may reach severe gale in exposed parts of Southland, Otago, the Canterbury Plains including Christchurch and Banks Peninsula, Marlborough, Wellington and Wairarapa, including the Tararua District until around midday Friday.
Strong northwesterlies will precede the front, with relatively warm temperatures, before a big drop with the front colder southwest change.
Napier will go from a high of 28C today to 18C tomorrow.
Queenstown and Alexandra are in for a chilly night tonight with bitterly cold lows of 2C forecast.
With clear skies also forecast there is a chance of frost, Griffin said.
On Saturday a high lies over the South Island, and an east to southeasterly flows cover the North Island.
The high will build over much of the country during the weekend, bringing fine weather for most places.
The upper North Island can expect a few showers, and Northland may get some rain courtesy of the remnants of ex-tropical cyclone Linda.
The storm, which reached Category 1 cyclone level on Wednesday, formed to the northeast of Queensland and brought dangerous waves to parts of Australia's East Coast.
"But that ridge of high pressure should keep the effects [of Linda] largely to the north of the country," Griffin said.
Today's weather
• Whangarei
Cloudy at times. Light winds. 22C high, 15C overnight.
• Auckland
Fine this morning. Partly cloudy from afternoon. Light winds. 24C high, 16C overnight.
• Hamilton
Cloud increasing, chance shower. Westerly breeze. 23C high, 14C overnight.
• Tauranga
Fine. Westerly winds. 24C high, 16C overnight.
• New Plymouth
Cloudy. Occasional showers, mainly this afternoon. Northwesterlies turn southwest at night. 21C high, 13C overnight.
• Napier
Fine, afternoon high cloud. Northwesterlies. Chance shower tonight with southerly change. 28C high, 14C overnight.
• Wellington
Cloudy at times with northerlies, strong where exposed. Chance shower with strong southerly around 8pm. 22C high, 12C overnight.
• Nelson
Fine, high cloud at times. Westerlies, dying out this evening. 24C high, 12C overnight.
• Christchurch
Fine with northerlies this morning, then cloudy and chance shower with a southerly change around midday. 24C high, 9C overnight.
• Dunedin
A few showers clearing this afternoon. Strong southwesterlies, easing evening. 18C high, 7C overnight.