Niijima - surf spot statistics

Niijima, Japan, offers surfable waves year-round, but the conditions vary significantly depending on the season. The best months for surfing here are typically August and September, when ground swell percentages increase (31% and 29%, respectively), providing cleaner, more powerful waves compared to other months. During these months, wind conditions also improve slightly, with 23% and 14% good wind days, though still often challenging due to prevailing onshore winds. Swell size averages around 1.5–1.7m, suitable for intermediate to advanced surfers. Winter months (December–March) bring larger swells (1.8–2.0m), but the wind conditions are generally poor (87–90% bad winds), making sessions inconsistent. From April to July, swell energy shifts heavily toward wind swells (80–92%), and while wave frequency remains high, quality suffers due to choppy conditions. May and June see the smallest waves (1.5m) and the highest wind swell dominance (90%+). October and November mark a transitional phase with decent swell size (1.8–1.9m) but worsening wind conditions. Overall, late summer (August–September) stands out as the most reliable window for better-formed waves and slightly improved winds, though surfers should expect variable conditions year-round and prepare for frequent wind challenges.

October at Niijima offers solid surf conditions with an average swell height of 1.9m and a decent period of 9.0s, providing well-organized waves. The swell direction is predominantly from the ENE and E, with the highest frequency of rideable waves (1.5-2.5m) coming from these directions—ideal for generating quality surf. Smaller but still surfable waves (1-1.5m) are common from the ESE and E, while larger swells (2-2.5m) occur often enough to challenge experienced riders. The wind, however, is less cooperative, with offshore conditions (ideal for surfing) occurring only 9% of the time. NE and ENE winds are dominant, often blowing at 20-40kph, which can create choppy or cross-shore conditions. While the swell consistency is good, wind quality is the limiting factor, requiring patience for clean sessions. Overall, October delivers solid wave energy but demands selectivity regarding wind timing for the best experience.