Bombies - surf spot statistics

Best Surf Season (December - March)

The heart of the Northwest Monsoon brings the most consistent offshore wind window to Bombies. From December through March, the synoptic pattern over Indonesia is dominated by a strong winter monsoon flow out of the north and northwest, directly aligning with the reef’s offshore wind demand. This period sees the highest percentage of ideal wind conditions (peaking near 41% in February) combined with a steady diet of powerful, long-period southerly groundswells generated by intense low-pressure systems roaring through the Southern Ocean and the Roaring Forties. The average swell holds at a solid 1.5m with period averages of 12-13 seconds, providing punchy, rippable waves that are well-shaped by the offshore breeze. During these months, expect clean, lined-up sets breaking across the reef with the classic Bombies barrel when the swell kicks up.

Fair Surf Season (April - May / October - November)

These transition months offer a mixed bag of conditions as the monsoon direction flips. In April and May, the Northwest Monsoon weakens and the prevailing wind shifts toward the east and southeast, increasing the frequency of onshore and side-onshore winds. However, the tail end of the southern hemisphere swell window still delivers frequent, long-period groundswells (April average period 13.8s, May 14.2s) and the average wave height climbs to 1.7-1.8m. At the same time, October and November mark the return of the northwest winds, but the transition is slow and the wind consistency is low (only 3-9% ideal). Still, when a fresh NW pulse aligns with a good S or SSW swell, the conditions can turn on quickly and produce exceptional sessions. These months require flexibility and a close eye on the forecast.

Low Surf Season (June - September)

The Southeast Monsoon (dry season) fully establishes from June through September, bringing relentless trade winds from the SE and ESE that blow directly onshore at Bombies, ruining wave quality. Despite being the absolute peak of the southern hemisphere swell window, with average wave heights climbing to 2.0-2.1m and periods hovering around 14.5s (the largest and most powerful swell of the year), the wind is adverse over 90% of the time in August and September. These strong SE trades create bumpy, chopped-out surfaces and make the reef nearly unsurfable. Only the slightest wind shifts or rare local land breezes can offer brief windows. This is the quietest period for consistent surfing at Bombies, best reserved for bigger, more protected spots or for those willing to gamble on a fleeting window of clean conditions.

May: Swell Peak Meets Trade Wind Dominance

May marks a critical turning point: the ideal offshore wind percentage drops to 23%, as the Southeast Monsoon firmly establishes itself. The dominant wind directions shift to ESE (19.9%) and SE (25.3%), which blow straight onshore at Bombies and wreak havoc on surface conditions. The swell, however, is at its peak in terms of period (14.2s) and average height (1.7m). The swell direction is strongly from the SSW (61.5%) and S (27.4%), with a high proportion of 1.5-2m swells (29.9% from SSW) and even 2-2.5m waves (9.1% from SSW). This is the most powerful, long-period swell window of the year, but the onshore trade winds chop it up significantly. Only the rare early-morning land breeze or a localized wind shift from the north can provide a clean session. Surfers must be selective and forecast-savvy to score the few moments when the swell aligns with a clearing offshore flow.