Some regional flights have been cancelled this morning due to low visibility, Wellington Airport says.
MetService says visibility is currently up to 13 kilometres.
Air New Zealand has confirmed the 10 regional flights it has cancelled are due to the weather.
Golden Bay has also cancelled its flights between Wellington and Tākaka.
Meanwhile, Sounds Air has listed some of its flights as having an indefinite delay.
Wellington Airport is advising passengers to check directly with their airlines for updates on their flights.
The low cloud would gradually improve through the day, MetService said.