A man was plucked from Tauranga Harbour after bystanders saw a man struggling in the water.

Emergency services were called to Sulphur Point about 1.45pm yesterday after witnesses saw a man's head bobbing in and out of the water.

Police and ambulance responded to the event just in front at the Tauranga Yacht & Power Boat Club.

Witness Kathy Donnelly said she saw a man on the beach wrapped in a survival blanket and then loaded into an ambulance just after 2pm.

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"We pulled up in our motor home to look at the view and next minute we see a ambulance and a body on the beach covered in one of those tinfoil survival blankets," she said.

"The guy was just talking but others saw his head bob up and down in the water, that's when they rushed out to get him."

Ms Donnelly said the man looked to be in his late 30s.

Police communications confirmed the incident came in about 1.45pm.

A Tauranga Hospital spokesman confirmed the man was in a stable condition later yesterday afternoon.