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.

March at Boca Barranca offers surfable conditions with a mix of smaller and mid-sized swells, though consistency depends on wind alignment. The average swell height is 0.9m with a strong 14.4s period, indicating well-spaced, powerful waves when they arrive. The dominant swell direction is from the SSW (74.17% of waves in the 0.5-2m range), producing rideable shoulders, while SW swells contribute another 9.8% for variety. Smaller S swells (12.15%) can provide playful options, though larger sets are rare—only 0.51% of swells exceed 1.5m. Wind is the limiting factor: 40% of days are clean (offshore NNE to ENE breezes under 20kph), but 37% bring sideshore SSW/SW winds 10-30kph that can chop up faces. Mornings often have lighter winds, with stronger afternoon gusts. Expect a mix of knee-high to head-high waves, best suited for intermediate to advanced surfers who can maximize the long-period energy on lower tides. Prime sessions occur when SSW swells align with NNE winds—watch for these windows, especially early in the day.