Fiji has a stable and pleasant tropical climate, with temperatures never straying much from 25-30C. Serious weather systems are rare, and though there is a wet season from November to April there is usually a brief deluge every day no matter what the time of year. The slightly drier months from May to September are also higher in humidity.
Similarly, the Cook Islands enjoy pleasant weather all year round, with a cooling sea breeze to take away any stickiness in the wet season (December to March) and pleasant clear skies during the drier winter (June to September).
Far-flung even by South Pacific standards, French Polynesia’s lovely climate only adds to the idyllic feel of its islands. From May to November morning temperatures will be around 20C, climbing to around 30C over the course of the day, with humidity relatively low. From November to April it is a little warmer and muggier, but tropical storms are rare and only happen as a result of El Niño.
In Samoa, as with much of this area there is a distinct wet season between November and March, while it is drier from April to October, but it does tend to be fairly hot and humid most of the year. As both main islands are mountainous the interiors can often be shrouded in low cloud and as a general rule more rain falls in the south of the islands.