Just 8° south of the equator, Bali has a tropical climate which is hot all year.
The average temparature hovers around 30°C (mid-80s°F) year-round, but the humidity can make the heat feel very oppressive. Direct sun feels incredibly hot, especially in the middle of the day when you'd be crazy if you didn't stay in the shade. There are dry and wet seasons - dry from April to October and Wet from October to March - but it can rain at any time of year and even during the wet season rain is likely to pass quickly. In general, the best months are April to September, when humidity is lower and the rain is light and infrequent.

Overall, the climate is gently tropical, but there are marked variations across the island: around the coast, sea breezes temper the heat, and as you move inland you also move up, so the altitude works to keep things cool. In fact, at times it can get very chilly up in the highlands, and a warm sweter or light jacket can be a good idea inmountain villages like Kintamani and Candi Kuning - Bedugul, The nothern slopes of Gunung Batur always seem to be wet and misty, while a few kilometres away, the east coast is nearly always dry and sunny.

Air-conditioning is not really needed on Bali. A cool breeze always seems to spring up in the evening, and the open bamboo windows, so common in Balinese architecture, make the most of the lightest breeze.