Four search teams looking for missing tramper Alistair Levy camped in the field in Kahurangi National Park overnight.
This morning they have been joined by three new teams, including a second search and rescue dog.
Search coordinator Sergeant Mike Fitzsimons said there was intermittent rain and limited visibility in the area, but it was expected to clear later in the day.
Searchers are in the Mt Owen area which is extremely rugged country.
Mr Levy, who is from Palmerston North, reached the summit of Mt Owen on Sunday and had been expected to join family in Christchurch on Monday. The search for him started on Christmas Day.