It is the third consecutive day fog has affected Auckland and caused flight cancellations and delays.
While it might take until late morning for the fog to burn away, much of the country could expect a clear, sunny day after that, Metservice meteorologist Andrew James said.
At the moment, though, there was "low visibility" around affected areas, mainly in Auckland and Waikato.
Eastern Bay of Plenty and parts of Taranaki might find the fog creeping in that direction as well. Light winds and clear skies overnight had helped the temperature drop and allowed "that low-level mist".
Today's temperatures would be typical for this time of year, reaching mid to high teens in the north, and mid to low teens in the south, James said.
Fog at Narrow Neck Beach, Devonport. Photo / Brett Phibbs
Auckland should get a high of 17C and a low of 11, while Wellington may reach 14C today and 10C overnight. Christchurch should also reach 14C today, with a low of 4C overnight.
Once the sun is out, James recommended people use today to get their outside chores down, as the rest of the weekend won't be as nice.
A front coming through overnight will bring showers to western areas late this evening.
"[There's a] bit of a deteriorating trend."
The North Island will be showery, and the South Island can expect heavy rain in some places on Sunday.
