Aucklanders are waking up to "extreme fog" on Thursday morning with commuters warned there could be disruptions to their travel.
Forecasters said there is a high chance of visibility going below 1km for large parts of the North Island, with the heaviest fog predicted for Waikato, Bay of Plenty, and Northland regions.
Fog restrictions are in place at Auckland Airport with travellers urged to check with their airline for any flight disruptions.
Auckland Airport said Air New Zealand has confirmed approximately 15 domestic regional flights have been cancelled and three domestic regional flights have been delayed, due to the fog.
Currently, no international flights have been affected.
Waka Kotahi is warning commuters in Auckland and Northland to take care on the roads on Thursday morning.
"It's foggy out there, so with reduced visibility please remember to keep your lights on and allow extra time and mind your following distance this morning," Waka Kotahi said on Twitter.
Auckland Transport is warning locals to expect delays to the Hobsonville and Beach Haven ferry services on Thursday morning because of the extreme fog in the harbour.
NIWA announced on Wednesday that July was the wettest on record, but also, the fourth warmest.
Analysis from NIWA found the majority of the country observed rainfall 149 percent above the average for the winter months and there were also five separate weather events, that caused widespread flooding around the country.
Christchurch had the wettest month of any month in its history, recording 310 millimetres of rain.
A large part of the South Island is under weather warnings or watches.
MetService issued a heavy rain warning for Fiordland where they warned the rain may cause streams and rivers to rise rapidly, surface flooding and slips are possible, and driving conditions may be hazardous.
Westland down to Otago is under a heavy rain watch with MetService warning it will likely be upgraded to a warning on Thursday morning as the area is expected to see heavy rain.
A strong wind watch has been issued for the Canterbury High Country, Banks Peninsula, Southland including Stewart Island and Otago with wind expected to approach severe gale in exposed places at times.
