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.

June at Inamuragasaki offers moderate surf conditions, with an average swell height of 1.2m and a decent period of 8.2s. The swells predominantly arrive from the ESE, SE, and SSE directions, with wave heights most frequently in the 0.5-1.5m range, providing manageable waves for intermediate surfers. Larger swells (1.5-2.5m) occur less often but can deliver more powerful rides, particularly from the SSW direction. Wind conditions are less favorable, with only 20% of days offering ideal offshore or light cross-shore winds (typically from the W or NW). Onshore winds from the S, SE, and E are more common, especially in the 10-20kph range, which can create chop and reduce wave quality. The spot handles SSW swells best, as they align with the break, but strong SW winds may spoil sessions. Overall, June provides rideable waves, though consistency and wind interference limit premium conditions. Patience is key—wait for the rarer clean days with ESE-SSE swells and lighter winds for the best surf.