A whopping 25C high is set for Auckland and a hot night awaits those in the city as well, thanks to an overnight low of 16C.
Scattered showers are expected in parts of the North Island, excluding Horowhenua and Wellington, and isolated thunderstorms and hail are possible south of Auckland.
Many holidaymakers will be returning home today after a break for the New Year.
The holiday road toll has hit 11 this year - well above the four people killed over the same period last summer.
"We know people will be keen to get home and the weather conditions will make driving challenging in many parts of New Zealand," says Assistant Commissioner Scott Fraser.
"But we don't want to see any more families impacted by tragedy this holiday period and we need all road users to play their part in getting everyone home safely."
"It's very simple - keep your speed down and appropriate to the conditions, watch your following distances, put the phones away, and take a break if you feel fatigued."
"By doing these simple things we look after our families, each other and everyone on the roads."
Thunderstorms possible in central North Island
It will be a good day for a movie for those holidaying in Rotorua, as showers are forecast today.
The MetService says those showers will become more frequent from this afternoon with possible thunderstorms and localised downpours in the mix.
Light winds are also on the forecast and people will be happy to know conditions are expected to clear by tonight.
Similar weather is expected in TaupΕ, where the temperature is set to reach about 22C at its peak. An overnight low of 12C is on the cards.
It is a little chilly in Wellington early on, with the temperature at 15.9C about 8am.
But save for some morning and evening cloud, a fine day is expected in the capital.
Further south, a beautiful day awaits those in Marlborough and Nelson; while people in Buller and Westland can also expect the same - albeit with a few morning showers.
The same fine weather is forecast in and around Canterbury, but there will be a few showers inland from this afternoon.
"Long sunny spells" are promised by the MetService for those in Otago, Southland and Fiordland. Cloudy periods are, however, expected and there will be some isolated showers.
