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.

October: The Monsoon Shift Begins

October marks a significant shift as the southeast trades retreat and the westerlies start to re-emerge. Offshore wind frequency jumps to 22% – still not great, but a marked improvement. The wind becomes more variable: ESE (25.8%) and SE (27.2%) still dominate, but there is increasing SW (4.6%), WSW (3.7%), and W (2.7%) flow. Swell averages 1.8m at 13.5s, with an overwhelming 83.1% from SSW – the highest single-direction concentration of the year. Wave heights are mostly 1.5-2.5m, with 18.1% from SSW in the 2-2.5m range. The longer period (13.5s) ensures power. As the monsoon transitions, there are more clean mornings with offshore winds, and the occasional westerly wind day can deliver excellent, glassy surf. October is the start of the recovery – keep an eye on the synoptic charts.