Here's what you can say about the months in Bali:
Dry season Lasts from April to October. This is the most popular time to visit Bali. At this time of year the weather is usually clear and sunny, the air temperature is pleasant and rain is rare. The sea breeze slightly softens the heat, making this time of year ideal for beach holidays and water sports. Tourist traffic is usually high, especially in July and August, so it is worth booking your accommodation in advance.
Off-season This time falls in April and October. These months usually offer the best combination of good weather and relatively low prices. Tourist traffic is less intense, and you can enjoy almost all the benefits of the island without large crowds of tourists.
Rain season Lasts from November to March. This period is characterized by frequent rains and high humidity. But despite the rains, the island remains green and beautiful. If you don't mind cloudy and rainy weather, you will get lower prices for accommodation and fewer tourists.
Peak season Lasts from late December to early January. At this time of year, Bali comes alive with Christmas and New Year celebrations. The tourist flow is at its peak, and hotel and airfare prices can be very high. If you are planning a trip during this time, make all your reservations in advance.