A 13-year-old missing for a week in Whanganui has been found "safe and well".

Topine Horomona had been last seen on Tuesday August 12 when he was dropped off at a karate lesson on Ridgeway Street.

Senior Sergeant Paul Baskett said earlier today that Topine's family were "sick with worry".

"Topine was dropped off at his karate lesson at approximately 5:30pm and despite our inquiries and appeals and the efforts from his family and local media, we have not been able to locate him.

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"We have been in contact with his caregiver and family to understand his behaviour prior to his disappearance," Mr Baskett said.

"All we want to know is that he is safe."

A media release this evening said about 5:30pm today police were advised of Topine's whereabouts in Whanganui.

"He was located safe and well and police are working with Topine's caregiver and family to ensure his welfare."