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.

June at Niijima offers surfable conditions, though consistency and quality vary. The average swell height is 1.5m with a decent 8.3s period, providing some power but often staying below head-high. The most frequent swells come from the ENE to SW sectors, with ENE, E, and ESE contributing the most rideable waves in the 1-2m range. SW swells, though less frequent, pack the most energy, delivering the biggest waves (1.5-2.5m+). Wind conditions are tricky—only 18% of the time are they ideal (likely light offshore or cross-offshore), while SW to WSW winds dominate at 10-30kph, creating chop or sideshore bumps. Mornings may see cleaner conditions before afternoon winds pick up. For intermediate to advanced surfers, target SW swells paired with rare ENE winds for the best sessions, but expect variable wind interference. It’s not prime season, but patient surfers can score fun to good waves, especially early in the day.