Scar Reef - surf spot statistics

Best Surf Season (May - October)

During the heart of the Indonesian dry season, the Indian Ocean roars to life with consistent, long-period groundswells sent northward from the Roaring Forties and polar lows. While Scar Reef faces northwest—ideally suited for swell from the north and west—the data reveals that the dominant swell direction is actually from the SSW to SW. This may seem counterintuitive, but these southerly swells wrap around the island and refract into the reef with remarkable power and length. Combined with nearly 90% offshore wind conditions (blowing from the SSE to SSW), the result is a prolonged stretch of clean, groomed waves that can range from fun, rippable 1–1.5m faces to heavier 1.5–2.5m sets. Average wave periods hover around 14–14.5 seconds, delivering the kind of juice that makes the reef come alive. This is the window when Scar Reef truly earns its reputation.

Fair Surf Season (March - April & November)

The transition months between the monsoon extremes bring a mix of conditions. March and April see the southeast trades strengthening and the offshore wind percentage climbing from 44% to 69%, while the groundswell remains present but slightly less consistent. Swell heights average a solid 1.2–1.3m with periods around 13–14 seconds, still capable of producing punchy, rideable waves—especially on days when the wind lines up. November marks the return of the wet season, with ideal wind dropping to 81% and swell heights easing back to 1.3m. Expect a blend of fun-sized waves and occasional background noise. Patience and careful tide timing can yield unexpected gems during these shoulder months.

Low Surf Season (December - February)

The northwest monsoon exerts its grip over the region from December through February, bringing less favorable wind patterns and a reduction in overall swell quality. Offshore wind percentages fall to 27–48%, and the average swell height dips to 1.3m with periods shortening to 12.6–12.8 seconds. While the dominant swell direction remains SSW/SW, the wind—often blowing from the north or northeast—blows onshore for much of the time, putting a chop on the wave face and making conditions less inviting. Small, fun-sized waves can still be found, especially on lighter wind days, but this is the least reliable period. For those chasing clean, groomed lines, the low season is best avoided unless you're willing to gamble on a weather window.

December: The Return of the Monsoon

December marks a significant downturn as the northwest monsoon fully establishes. The average swell height is 1.3m with a period of 12.8 seconds. Swell direction remains from SSW (63.7%) and SW (35.9%), but offshore wind ideal conditions drop to 48%. The wind distribution shows a major increase in SSW (16.6%), SW (17.3%), and WSW (12.6%)—many of which blow onshore or cross-shore at the NW-facing reef. The result is a mix of marginal days with bumpy surface conditions and occasional clean windows when the wind swings to the SSE or S. The 1–1.5m range dominates, offering fun-sized waves but with lower consistency and poorer wind quality than the dry season. December is the least reliable month, but if you're desperate, pick a day with strong southerly winds.