Nadi in March

May through October is peak season for good reason — less rain, lower humidity, and trade winds that actually make it comfortable. July gets busy with Australian school holidays, so book ahead. November through April brings cyclone season and daily afternoon downpours, but also fewer crowds and cheaper accommodation. The rain usually hits around 2pm and clears by evening. January and February are the wettest months — skip these unless you're getting serious deals. Water temperature stays warm year-round, but visibility for snorkeling improves dramatically in the dry season.