At least five flights out of Wellington have been delayed this morning due to thick fog blanketing most of the city.
Flights to Dunedin, Christchurch, Nelson and Hamilton suffered delays, with smaller turbo prop aircraft affected.
MetService said the fog is expected to start lift and there will be fine spells this afternoon.
However the fog is due to return this evening with drizzle and low cloud, meteorologist Andy Best said.
He said more drizzle and strong northerlies are forecast for Wellington tomorrow.