Bali's dry season runs from approximately May through to October, with June, July and August the most reliably dry and the most popular months. The weather during this period is warm rather than hot, with lower humidity and mostly clear skies — ideal for outdoor yoga, hiking through the rice terraces and the early morning walks that make a Bali retreat feel qualitatively different from staying in a hotel. The more popular retreat centres and wellness resorts book up well in advance during peak season; book at least three to four months ahead for July and August.
September and October are arguably the best months to visit for a retreat. The dry season is still broadly in effect, the summer crowds have thinned, and the light — particularly in Ubud — takes on a golden quality that photographers return for year after year. November marks the beginning of the wet season, when daily rain becomes common in extended afternoon and evening downpours. The rain is warm and rarely lasts all day, and the landscape becomes intensely green. Many retreat-goers prefer this period — it is quieter, cheaper, and the rain creates a natural rhythm to the day that reinforces the slowness a retreat requires.
December, January and February are the wettest months. Some smaller retreat centres reduce capacity or close entirely, though Ubud in the rain has its own atmosphere and prices are at their lowest. March and April are transitional — improving weather, good prices and a gentler pace than high season.