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 May, Inamuragasaki offers moderate surf conditions with an average swell height of 1.3m and a decent period of 8.1s, providing rideable waves for intermediate to advanced surfers. The predominant swell directions are from the E to SE, with the highest frequency of waves in the 0.5–1.5m range, particularly from ESE (8.89% in 0.5–1m and 8.34% in 1–1.5m). Larger swells (1.5–2.5m) are less frequent but occur often enough from SE and SSE to deliver solid sessions. Wind conditions are variable, with only 18% of days offering ideal offshore or light cross-shore winds (typically from the W to NW). Unfortunately, onshore winds from the S to SE are more common, especially in the 10–30kph range, which can degrade wave quality. The spot handles SW windswell and groundswell combinations best, though stronger SW winds (20–50kph) are frequent and may create choppy conditions. Overall, May provides fair surf opportunities, but patience and timing are key to scoring cleaner waves with favorable winds.