The search for a fisherman missing offshore from Waihi has been suspended for the day.

The 24-year-old Rotorua man went fishing with his brother-and-law and 10-year-old nephew in a 4m aluminium dinghy last night.

The search for them began just after midnight when it was reported the boat capsized as it attempted to cross the Bowentown Bar. The brother-in-law and nephew were found by another fisherman washed ashore this morning.

Waikato police Search and Rescue co-ordinator Sergeant Vince Ranger said the police dive squad will join the search for the man tomorrow.

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In the meantime, surf clubs will continue monitoring the beach.

Mr Ranger said police had grave concerns for the safety of the missing man.

The search area measures six nautical miles.