Hundreds of boats, including multimillion-dollar yachts, are forecast to be sold this weekend in Auckland.

More than 20,000 people are expected through the Auckland on Water Boat Show at the Viaduct Harbour - and some visitors will be reaching for their wallets.

The chief executive of the Marine Industry Association, Peter Busfield, said the premier boat show, which opened yesterday, attracted a crowd that included international buyers looking for the newest and best in the industry.

Already, there has been potential sales and Mr Busfield said he expected buyers for everything from a 3m tinnie to $5 million luxury craft.

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"There was a good crowd today and exhibitors are pretty impressed. People are looking at buying boats and equipment again ... after a long winter," Mr Busfield said.

More than 200 exhibitors have filled four pavilions with everything needed to decorate, protect, enhance, or build a boat.

The boat show runs until Sunday.