Sanur - surf spot statistics

Best Surf Season (December - March)

When the Australian monsoon retreats and the Intertropical Convergence Zone shifts south, Sanur enters its prime window. From December through March, the prevailing wind pattern shifts to a dominant westerly flow, bringing clean offshore breezes (SW, WSW, W, WNW) that groom the swell into crisp, long-period lines. The average wave period hovers around 12-13 seconds, delivering powerful, rippable waves in the 1-2m range. This is when the magic happens: the Indian Ocean storm track fires up, sending consistent SSW/SW groundswell that wraps around the southern tip of Bali and arrives with serious push. Expect 55-63% offshore wind frequency, making these months the most reliable for quality surf at Sanur.

Fair Surf Season (October - November & April)

October and November mark the transition from the dry southeast monsoon to the wet northwest monsoon. The offshore wind window starts to open, with ideal conditions occurring 22-38% of the time. Swell heights average 1.6-1.8m with long periods (12.8-13.5s), but the wind can be fickle – a mix of light sea breezes and early westerly onslaughts. April is similar on the tail end of the wet season, with 19% offshore but a strong shift to cross-shore trades. These months require a keen eye on the forecast, but when the alignment hits – a strong storm in the Southern Ocean and a westerly wind regime – you can score pumping, long-period surf under sunny skies.

Low Surf Season (May - September)

The southeast trade winds dominate from May through September, bringing relentless onshore winds from the E-ESE-SE that destroy wave quality. Offshore wind frequency plummets to 1-7% – nearly non-existent. The swell is there, though: the average height actually peaks at 2.0-2.2m with periods over 14 seconds, thanks to persistent Southern Ocean storms. But those beautiful long-period groundswells are accompanied by brutal, choppy winds that turn the lineup into a washing machine. Expect wind swell and messy conditions. Only the occasional lull in the trades or a rare westerly wind event can offer brief windows of rideable surf. This is the time to explore other breaks or wait for the monsoon shift.

January: Peak of the Offshore Monsoon

January locks in the wet season pattern with ideal surfing conditions 62% of the time. The dominant westerly wind flow (W at 40.8%, WNW at 16.9%, WSW at 12.1%) creates near-perfect offshore grooming on the east-facing reefs. Swell arrives predominantly from SSW (35.7%) and SW (47.4%), with average heights of 1.7m and a solid 12.2s period. The brunt of the energy comes in the 1.5-2.5m range, delivering punchy, hollow waves that are rippable on the right tide. Occasional bigger pulses from SW/WSW push into the 2-2.5m range, offering heavy sessions for advanced surfers. The combination of long-period groundswell and consistent offshore wind makes January a prime month – expect clean, lined-up sets with occasional barrels on the inside reef.