Inamuragasaki - surf spot statistics

Inamuragasaki, Japan, offers surfable waves year-round, but conditions vary significantly across seasons. The best months for surfing are typically from September to March, when ground swell contributions are higher (20-29%) compared to wind swell dominance in summer. During this period, mean swell size hovers around 1.2-1.4m, providing more consistent and cleaner waves. September through November stands out as the prime window, with ground swell still present (24-26%) and marginally improved wind conditions (22-25% good winds). Winter months (December-February) bring slightly smaller swells (1.1-1.2m) and the worst onshore winds (bad wind conditions 77-81%), but ground swell remains reliable (22-24%). Summer (May-August) is less ideal, with wind swell dominating (68-89%) and smaller waves (1.2-1.3m), though August sees a temporary ground swell increase (29%). Wind conditions are generally poor year-round (75-83% bad winds), but autumn offers the least unfavorable winds. For advanced surfers, targeting September-November balances decent swell size, manageable winds, and a higher chance of ground swell. Early mornings or offshore wind days are key due to persistent onshore winds.

March at Inamuragasaki offers fair surfing conditions with an average swell height of 1.4m and a decent period of 8.6s, suggesting generally manageable waves with some power. The swell direction is predominantly from the E-ENE sector (peaking around 5-6% in the 1-1.5m and 1.5-2m ranges), which lines up reasonably well for this beach break, though smaller swells (0.5-1.5m) are more frequent than larger ones. Wind conditions are the limiting factor—only 19% of the time is ideal (likely light offshore or cross-offshore breezes), with problematic winds often blowing from the N-NNE (moderate to strong onshore). SW and WSW winds also appear gusty at times, which could make sessions choppy. Expect the best windows when ENE/E swells coincide with lighter winds, offering cleaner shoulders. Overall, it’s a mixed month: rideable but inconsistent, with patience needed for optimal conditions.