The National Disaster Management Office (NDMO) said it had activated the national emergency operations centre.
A cyclone alert remains in force for Yasawa, the Mamanuca Group, Viti Levu, Kadavu, Lomaiviti and Southern Lau.
On its projected track, Harold, currently a category five storm, was expected to lose strength but pass just south of Kadavu before moving towards southern Lau on Wednesday.
The NDMO urged families and communities to put into practice their disaster preparedness plans.