Backdoor - surf spot statistics

Backdoor in the United States offers consistent surf year-round, but the best conditions typically occur during the winter months, from November through February. During this period, ground swell dominates (76-88% of the time) with mean swell sizes ranging from 1.7 to 2.0 meters, providing powerful and clean waves. The downside is that wind conditions are less favorable, with bad winds occurring 52-64% of the time, but when the winds align, the surf is exceptional. Late fall (October) and early spring (December) also see strong ground swells (72-85%) and slightly improved wind conditions (44-48% good winds), making them solid alternatives. The summer months (May-August) bring smaller swells, primarily wind-driven, with lower mean sizes (1.1-1.3m), though July and August see slightly better wind conditions (38-41% good winds). September stands out as a transitional month with improving ground swell presence (37%) and the best wind odds year-round (51% good winds), offering a balance between swell quality and cleaner conditions. Overall, advanced surfers will prioritize the winter swell power, while those seeking more manageable waves and fewer crowds might prefer late fall or early spring sessions.

August at Backdoor offers surfable conditions, though not always ideal. The average swell height is 1.1m with a decent period of 9.7s, providing some energy for shaping rideable waves. The primary swell directions are ENE (38.75%) and NE (39.69%), contributing to the majority of waves in the 0.5-2.5m range. These swells are typically cleanest when paired with favorable offshore winds, which occur only 38% of the time. Wind conditions can be hit or miss—light to moderate ENE/NE breezes offer the best setup, but stronger S/SSW winds (which blow onshore) are present around 10-15% of the time, potentially disrupting wave quality. Expect smaller, manageable surf (1-1.5m) on most days, with occasional bigger sets (1.5-2.5m) when ENE/NE swells peak. It’s a month for intermediate to advanced surfers who can work with varying wind directions and sporadic swell energy. Keep an eye on wind forecasts, as the difference between groomed peaks and choppy conditions hinges on wind alignment.