Fire Safety Officer Barry Gibson said he was closely monitoring the situation, which was exceptionally dangerous given the dry conditions around the city at the moment.
The fires, which were mainly in clusters, were all set in vegetation and most, if not all, appeared to have been deliberately lit.
The two most recent were on Monday in vegetation in Victoria Rd near John Wilson Ocean Dr, one at 6.20am in a tree and bush and one at 9.40pm in sand dunes, while seven were set within a minute alongside the Southern Motorway on Friday night.
In several callouts several fires were put out at a time.
The fires were mainly in the South Dunedin, Saddle Hill, Sunnyvale and Fairfield areas.
"We are concerned about it, because although so far they've been minor, they always have the potential to be quite serious," Mr Gibson said.
Dunedin police have asked the public for any information they had about suspicious activity in those areas.
Mr Gibson encouraged people who noticed fires to call 111 as quickly as possible, and to take note of any vehicles in the area, registration numbers, people, their clothing and descriptions of them to give to police.
• Two women police allege had been defrauding motels and restaurants around Dunedin since late December were arrested in Geraldine at the weekend.
The pair, both aged 20, who were wanted on active charges, are scheduled to appear in the Timaru District Court this morning.
