"Operating costs such as rent and payroll increases are generally outpacing retail sales growth, especially in Australia," he said.
The company is also facing increasing regional and global competition.
"Volatility and unpredictability is becoming the norm, which means providing forward guidance is not appropriate."
Still, Kathmandu is planning for continued growth and remains positive about the full-year outlook.
Since August 1, the company has opened new stores in Coastlands near Wellington, at The Palms in Christchurch and relocated its Camberwell store in Melbourne, taking total store numbers to 113.
It plans to open a new store in Warrnambool in Victoria and is relocating its Chatswood store in Sydney and its Willis Street store in Wellington before Christmas.
Kathmandu still aims to open 15 new stores during the current year and two further new Australian stores are scheduled to open early next year and a number of other sites are under negotiation, Halkett said.
Kathmandu shares are unchanged at $2.57, below their record at $2.66 since listing a year ago. The shares have risen from $1.89 in August.