Thick fog surrounded much of Hawke's Bay on Saturday but is starting to clear says MetService.
MetService meteorologist Ashlee Parkes said Napier was "very foggy" on Saturday, which only a short period of respite before the fog returned overnight.
"We've had extensive fog formation.
"The ingredients we look for when thinking about fog are clear skies, less winds and sufficient moisture in the lower atmosphere."
She said northeasterly winds on Friday and Saturday had helped send moisture off the ocean into the region, which meant "all those ingredients were there".