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.

June: Peak Dry Season – Tough Conditions

June delivers the most challenging conditions of the year for Sanur. Offshore wind is effectively absent at 2% – the trades roar from ESE (58.8%) and SE (21.7%), with 20-30kph speeds common. Swell is at its peak: average 2.1m with a very long 14.1s period – meaning powerful, groundswell-driven waves. The swell direction is a mix of SSE (8.8%), S (30.9%), and SSW (41.1%), with many waves in the 2-2.5m range. But the ESE wind creates steep, choppy faces and lumpy takeoffs. Only the first few hours of daylight, before the wind ramps up, offer a slim chance of decent surf. Advanced surfers may find heavy, windblown barrels, but for most, it's a frustrating month. The trade wind machine is in full force, making Sanur a windy, bumpy mess.