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.

In April, Inamuragasaki offers surfable conditions with an average swell height of 1.4m and a decent period of 8.5s, suggesting mostly clean and manageable waves. The swell distribution shows a primary influence from E to SE directions, with the highest frequency of rideable waves (1-2.5m) coming from ESE (7.48% at 0.5-1m, 7.71% at 1-1.5m) and E (7.14% at 0.5-1m, 8.01% at 1-1.5m), making these the most productive angles for quality surf. SSW and SW swells also contribute, albeit less frequently, with slightly larger waves (1.5-2.5m). Wind conditions are less favorable, with only 17% of the time offering ideal offshore (likely NW to NE) or light cross-shore winds. Stronger onshore winds from S to SW are more common, particularly in the 10-30kph range, which can degrade wave quality. Overall, April provides occasional good sessions, especially when E/ESE swells align with lighter winds, but inconsistency and wind interference mean patience is required for optimal conditions. Advanced surfers can capitalize on the larger SW swells, while intermediates will find more opportunities in the frequent 1-1.5m range.