He said the couple were only prepared for a day hike and urged people who were intending to hike over summer to ensure they are were well-prepared, which included researching walking tracks before heading out.
"They were not prepared at all for any overnight tramping. [People should] prepare for the worst. Take extra clothing, let people know of your intentions, for more serious trampers get a locator beacon," Mr Adamson said.
Police search and rescue member, Constable Marco Van Den Broek, said the group of four had set up shelter in the forest. He said some night hikers who came across the group had given them some "comfort gear", it was not clear what that gear was.
Mr Adamson said the Auckland woman was dehydrated but otherwise okay.
"The conditions last night were quite pleasant, it could have been worse...Know where you are going and seek advice," he said.
Statistics from New Zealand Search and Rescue for the Northland police district showed trampers and walkers account for 37 per cent of land incidents.