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.

October at Inamuragasaki offers decent surf conditions with an average swell height of 1.4m and a solid 9.0s period, providing consistent, well-spaced waves. The most dominant swell directions are from the east (E, ESE), contributing to the majority of rideable waves, particularly in the 1-2.5m range. These swells often produce clean, workable shoulders, though larger sets occasionally push through. Wind conditions are a mixed bag—only 23% of the time are they ideal (typically light offshore or cross-shore), but NNE and NE winds frequently blow in the 10-30kph range, which can create chop or affect wave quality. The best chances for glassy conditions come with lighter easterly or variable winds. Surfers should watch for incoming swells from the E-ESE quadrant, which deliver the most consistent size and power, while being mindful of northerly winds that may require early sessions for optimal shape. Overall, October is a reliable month for intermediate to advanced surfers, with a good mix of smaller, playful days and occasional overhead pulses.