Bali, due to it's proximity to the equator, has a tropical climate. Year round temperatures average 31 degrees Celsius and high humidity can be expected during the wet season (October - April). The dry season has a very pleasant climate with low humidity making it the best time to visit the island (May - September).

You can expect pleasant day temperatures between 20 to 33 degrees Celsius or 68 to 93 degrees Fahrenheit year-round. From December to March, the west monsoon can bring heavy showers and high humidity, but usually days are usually sunny and the rains start during the night and pass quickly. From June to September the humidity is low, and it can be quite cool in the evenings. During this time of the year you'll have hardly any rain in the coastal areas.

Even when it rains in most parts of Bali, you can often enjoy sunny days on the "Bukit", the hill south of Jimbaran Beach. On the other hand, in Ubud and the mountain area you must expect cloudy skies and showers throughout the year (this is why the international weather reports for "Denpasar" or "Bali" mentions the possibility of showers and rain storms during all times of the year). In higher regions such as in Bedugul or Kintamani you'll also need either a sweater or jacket after the sun sets,  especially during the dry season.