About 20,000 people are without power and roofs have also been ripped off buildings in the town of Dumbea, on the outskirts of Noumea.
Several ships have also been forced aground on the coast in Noumea although, according to a provisional report, no major damage was recorded following the cyclone, the intensity of which was a little lower than expected.
Meteo France NC said there was not a lot of rain during the storm but winds ranging from 130km/h to nearly 220km/h caused problems.
It's been reported 50mm of rain fell over six hours.
"Niran caused extensive damage to the power grid and to vegetation," a civil security spokesperson told the AFP.
About 400 people are still sheltering in evacuation centres in Noumea.
The cyclone is weakening as it moves to the southeast of the New Caledonian mainland.
- RNZ
