Boca Barranca - surf spot statistics

Boca Barranca in Costa Rica is a renowned river-mouth point break that offers long, peeling left-hand waves, heavily dependent on ground swells for quality surf. Analyzing the monthly averages, the best time to surf here is during the dry season, particularly from **December to April**, when ground swell consistency is high (80-87%), and swell size is manageable, averaging 0.8m to 1.0m. This period also sees slightly better wind conditions, with favorable winds occurring 37-44% of the time, though onshore winds are still frequent. The peak months for reliable ground swells are **February to May**, with March and April offering the best balance between swell size (0.9m-1.0m) and consistency. However, wind conditions are less ideal during these months, with bad winds prevailing 60-65% of the time, meaning early mornings often provide the cleanest waves. The wet season (**May-November**) brings larger swells (1.1m-1.2m) but also higher chances of onshore winds, particularly from September onward when bad winds occur up to 68% of the time. September and October see a slight drop in ground swell dominance (81-83%) and increased wind swell influence, which can make conditions less predictable. For surfers prioritizing clean, rideable waves, **December to February** may be optimal despite smaller swell sizes, as wind conditions improve slightly compared to later months. Overall, Boca Barranca is most consistent in the first half of the year, but surfers should expect frequent wind challenges regardless of season. Early sessions are recommended to maximize glassy conditions.

In September, Boca Barranca offers consistent surf conditions with an average swell height of 1.2m and a solid period of 14.4s, indicating powerful, well-spaced waves ideal for intermediate to advanced surfers. The swell predominantly comes from the SSW (47.68% in the 1-1.5m range) and SW (10.93% in the same range), delivering clean, rideable waves with good shape. While smaller waves (0.5-1.5m) dominate, occasional larger sets up to 2.5m provide variety. Wind conditions are variable, with only 32% of days offering ideal offshore or light winds (mostly from the NE-ENE sector). However, onshore SW and SSW winds can affect quality, particularly at higher speeds (10-20kph+, occurring ~4-8% of the time). Overall, September is a reliable month for surf, with the best sessions occurring when winds stay light and swells align from the SSW-SW. Advanced surfers will appreciate the long-period energy, though consistency depends on wind cooperation.