A police dive team are searching a section of Northland's coast for a missing woman.

The dive squad of four arrived last night and were in the water this morning to take advantage of the calm sea conditions. Two Northland police search and rescue squad members were also helping.

Police said the 52-year-old woman was last seen on Saturday swimming at Taupiri Bay, near the Bay of Islands.

A search by police search and rescue and LandSar teams on Sunday failed to find the woman. A fixed wing aircraft was also used but did not find any clues.