The swells that hit Indo are generated in the Indian Ocean, with the most reliable conditions occurring from May to September. June and July are the months when big swells are most likely, but good waves possible all year round.
May to September is generally the dry season, with Trade Winds from east to south-east. From October to April, winds tend to come from the west to north-west, so east coast breaks get the offshore winds. The breaks on Bali are well known, so here's a sample of top surf spots on other Indonesian Islands
Sumatra
The best waves break on islands off the west coast of Sumatra - Nias, Hinako and the Mentawais.
Teluk Lagandri (Nias) - the main break at the mouth of Lagandri Bay is a shortish, tight right-hander, but it tubes from take-off to the end. The outside reef works on the biggest swells and cranks out perfect barrels.
Hinako Islands - these small islands west of Nias feature some of the world's best left and right reef breaks - works on a 4ft swell but can hold up to 15ft, producing long, very fast, hollow and incredibly powerful tubes. Only accessible by boat.
West Java
A few islands off Java's southwest coast have good surf, but the more accessible Pelabuhan Ratu Bay is a total swell magnet and has about ten breaks accessible from the Ocean Queen Resort.

Ombak Tujuh - world class left hand point break is very consistent. Works on a 5ft swell but holds up to 12ft, when it's a very long, very fast and very powerful tube. Only accessible by boat.

  Nusa Lembongan
This small island off the southeast coast of Bali is a little, low budget surfers paradise. There are several good breaks accessible by a long paddle or a short boat ride. The best is:

Lacerations - for skilled surfers and thrill seekers, this very fast, hollow right hander breaks over a shallow reef. Works on a 5ft swell but holds up to 12ft - don't try it at low tide!

Lombok
East of Bali, this less developed island gets good swells, but the best breaks are hard to reach.

Desert Point: A long walled and incredibly hollow left-hander that on its day can break up to 300 metres, growing in size from takeoff to end. It's an epic wave, but inconsistent and needs a big swell to work - best reached by boat.

Sumbawa
There are two surf zones in Sumbawa - at the west end of the island, and around Teluk Cempi, a bay on the south coast. The west Sumbawa breaks are accessed by boat, and are usually uncrowded.

Scar Reef: A fast, walley left peak where you drive into several backdoor sections with tight, powerful tubes. Best between 5-10ft.

Super Sucks: Has been called the longest, most intense left hand tube ever ridden. Breaking over a long live coral reef, this wave reels faultlessly for 150 metres and gets even longer on a big swell. Get pitted from takeoff to exit. Best between 3-8ft.

Yo-Yos: Catches any swell and is the most consistent break in the area. It consists of 2 rights, one a wedge peak breaking off a cliff face; the other a walley right reef in the middle of the bay usually surfed when everywhere else is too small. Best between 2-6ft.

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