The main surf season is from April to October with south groundswells consistently hitting the islands producing world class waves. Indonesia is the ultimate surfer's paradise, thousands of islands are out there waiting for you. Certain areas are just starting to be explored for surf.
Indonesia can be split into two regions, of interest to surfers are the main islands: Sumatra, Java, Bali and Timor, the other islands of Borneo, Irian Jaya, Sonde and Moluques Islands have little surf potential.
Since it stretches along the equator, Indonesia's climate has a tendency to be quite similar all year round with an average temperature of around 30 degrees Celsius. Located in the tropics, Indonesia only as two seasons, the wet and the dry. The wet season generally occurs from October to March and is not necessarily consistent with Bali. The dry season occurs from April to September, with less humidity, dry days and sunnier weather. This is traditionally the busiest time for holiday goers. The severity between the seasons differs depending on where in Indonesia you are. The dry season generally gets the better surf as the swell comes from the S-SW. Not uncommon to get long periods of low to no wind during this time.
Although the wet season doesn't normally pose any major issues, some of the more remote regions can be a different story with mud-clogged roads, packed with the local mixture of traffic. Most rainfall in this region will occur during the wet season, but downpours are typical and can occur at any time, usually not lasting too long.
The best time to visit is between April and October, during the dry season. This usually brings a dramatic change to the level of tourism in the more popular areas. So it is definitely worth booking early, especially for the school holidays.
Java is Indonesias most populous island with a population of 135 million. West Java is where the famous Panaitan Islands lie. Java has an abundant of waves along its coast that only the adventurous will be rewarded. On the southern tip of the island is the famous G-Land or Grajagan.
Lombok is an island in the West Nusa Tenggara province of Indonesia. It is surrounded by a number of smaller islands locally called Gili. The capital and largest city is Mataram. To the east of Lombok lies the Alas Strait, a narrow body of water separating Lombok from Sumbawa to the east.
Sumba is an island and is part of the province of East Nusa Tenggara in eastern Indonesia. It is rugged country and getting around is difficult outside of staying at the known tourist spots. Plenty of rewards for the adventurous.
Sumbawa is located in the province of West Nusa Tenggara, with Lombok to the west, Flores to the east, and Sumba further to the southeast. It has a dry arid landscape with most surf found on the west and south coasts.