We left Rutea at the Port Denarau marina for three months this year while we traveled back to the States but it was not during cyclone season. Still, I was concerned but the marina staff promised that if a tropical storm approached, they'd move our boat to the 'bone yard'. The bone yard is on shore where they dig pits in the ground, line it with used tires and then lower the boat into it. It's a pretty safe way to ride out a tropical storm. Vuda Point Marina also offers this service
but I would not want to be in the water
at Vuda Point during any storm.
The worst storm to hit Fiji in recent memory was Tropical Cyclone Bebe and it hit on 21 October, 1972 - well before 'hurricane season'.
Fair winds and calm seas.