He and his late wife Cushla Martini owned the historic Carey's Bay Hotel overlooking the water at Port Chalmers, Otago, where they displayed the pieces.
Hotere lived in Otago for many years and often visited the hotel for a drink.
After the hotel was sold Mr Colman brought the collection to Auckland.
It was rare for such "an important and significant collection" of his works to come on the market, said Mr Thompson.
Hotere's works will be auctioned at the International Art Centre at 6.30pm, as part of a larger collection of early and rare works, expected to sell for up to $2 million.
Other significant works for sale were an oil on canvas by Charles Frederick Goldie, Relics of a Bygone Age, estimated to bring up to $280,000 and an oil painting of Mana Island by Don Binney, expected to bring up to $85,000.