Gili Trawangan (Gili Islands) weather in September

Forum posters describe September as genuinely good and mostly dry across Bali, with any rain typically arriving in the early evening or at night (commonly cited as starting around 3:30pm on a rainy day) rather than disrupting daytime plans. Temperatures stay comfortable, neither too hot nor cool. Posters consistently flag Bali's real microclimate variation - it can be raining in one spot while completely dry a mile away, with inland areas (Ubud and similar) generally wetter than the south coast where Jimbaran sits, one of the island's more reliably dry spots. The clear trade-off for the good September weather: this falls within Bali's July-September peak season, further boosted by Australian school holidays, so posters note it's also one of the more crowded times to visit.

Forum posters describe January as classified rainy season but consistently push back on treating that as a reason to avoid it - it's never raining all the time here, with showers typically lasting just an hour or two in the evening before clearing back to sun. Posters report a real range of experiences, from a little overcast with evening tropical rain but plenty of sun overall, to visits with barely any rain at all. Posters note late January can bring more wind, and diving visibility can dip slightly compared to the driest months, though not enough to spoil a dive - and unlike the choppier seas of July and August, fast-boat crossings to and from the Gilis stay comparatively smooth this time of year.

Gili Trawangan's forum calls July and August the pick of the year weather-wise, with regulars flagging late July as the point high season really kicks in — expect the busiest boats and beaches from here through September. The trade-off for the reliable weather is the crowds, so regulars suggest booking accommodation ahead.