We all know that the Fijian Islands have a tropical climate, but you may not know the climate is classified as "marine tropical" and actually has distinct seasons. There is a cooler dry season in Fiji and this is usually from April to October. Then there is the warm wetter season, which is more humid from November to March.
The air temperature is ideal for surfing in Fiji, ranging from the mid 70's to the mid 80's year around, making it almost impossible to get cold while in the water. Speaking of the water in Fiji, the water temp is also ideal year around with lows in the mid 70's and highs in the mid 80's. When it comes to surfing these are perfect temperatures that allow you to have long sessions!
The main climate factor that can have a major impact on the surf is the winds. As with most of the South Pacific, the trade winds blow from SE across the Fiji Islands, usually from June to September and can be strong, lasting several days. The strong trade winds during this time of year are usually not favorable for most of the surf breaks in Fiji, but if you give them a few days they usually will calm down. During the wet season however, the winds will blow from the North, which is offshore for most of the surf breaks along the South Coast and this makes for great surfing conditions. Fiji has good surf and a great climate year around, but it is always a good idea to check the weather and seasons before booking your trip.