You might find yourself asking when is the best time to visit the Gili islands; While rainy season officially begins in November and ends in April, this can vary from year to year and should only be used as a loose guideline. The best months for diving (both with ocean conditions and the crowds) are May/June and October/November although diving occurs in Gili Trawangan year round. These times are low to mid season and may also coincide with reduced rates in accommodation and fast boats.
The rainy season brings lower visability with runoff from neighboring Lombok and the high/dry season has more wind and which can lower water and air temperatures. The water temperatures rarely go below 27 degrees celsius with peak water temperature during the warmest times at approximately 32 degrees. There are very few thermoclines with areas of upwelling and cold sections at the change over between seasons.
