Fiji enjoys a desirable South Sea tropical climate and can get hot in the summer but seldom reaches above 35 Deg C (96 Deg F). Trade winds from the east southeast bring year long cooling breezes late afternoon and early evening.
The rainy season is from December through February. This is also the hottest part of the year in Fiji.
We like both the US NOAA page on the South Pacific weather patterns as well as the Fiji Meteorological Service page for up to date information.