Ohama - surf spot statistics

Ohama Beach in Japan is primarily windswell-driven, with ground swells playing a minor role throughout most of the year. The best surfing conditions typically occur from July to November when ground swell contribution increases slightly, peaking in August at 29%. However, even during these months, windswell remains dominant. Swell size averages a modest 1.1m to 1.4m year-round, with the largest waves seen from December to March (1.4m–1.5m). Unfortunately, wind conditions are generally poor, with bad winds (onshore/cross-shore) prevailing 75–83% of the time across all months. The least unfavorable winds occur from June to August, particularly in July and August when good wind probability peaks at 23–25%. Early winter (December-January) offers slightly larger swells but suffers from consistently bad winds (80%). Late summer (August) presents the best compromise—marginally higher ground swell influence and slightly better wind odds, despite the small average wave size. Surfers should prioritize July–September for relatively cleaner conditions, though expectations should be tempered given the spot’s reliance on windswell and frequent onshore flow. Overall, Ohama is a low-consistency break with no truly elite months, requiring patience and flexibility to score decent sessions.

July in Ohama, Japan, offers surfable conditions with an average swell height of 1.1m and a decent period of 8.5s, providing moderately clean and manageable waves. The swell direction is predominantly from the SW, SSW, and S, contributing to the majority of rideable waves in the 0.5-2.5m range—ideal for intermediate to advanced surfers seeking smaller but consistent surf. However, wind conditions are less favorable, with only 23% of the time presenting ideal offshore or light cross-shore winds (mostly from the E to ENE). The predominant SW and WSW winds can create choppy conditions, especially when stronger (20-30kph), affecting wave quality. Larger swells (1.5-2.5m) are less common but occur most frequently from the SW direction. Overall, July is a decent month for surfing here, but wind consistency is the limiting factor—early mornings may offer cleaner sessions before onshore winds pick up.