Ikumi - surf spot statistics

Ikumi, Japan, offers varying surf conditions throughout the year, with the best swells typically arriving between March and September. The spot relies heavily on wind swells, which dominate from February to October, peaking between April and August with consistency above 60%. Ground swells, while less frequent, become more prominent from July to September, reaching their highest probability (27-28%) in August and September. The mean swell size is modest, generally ranging from 0.6m in winter to 1.3m in summer, with the largest waves occurring in August (1.3m). Wind conditions are critical here, as unfavorable onshore winds plague much of the year, particularly from October to March when bad wind conditions exceed 79%. The best balance of swell and wind occurs from May to August, when wind quality improves slightly (34-44% good winds), though even then, bad winds remain prevalent (56-66%). July and August stand out as the prime months, offering the highest ground swell contribution, decent wind swell consistency, and the most favorable wind conditions of the year. September still holds decent swell but sees a sharp decline in wind quality. Winter months (December-February) are less reliable, with smaller swells and consistently poor winds. For experienced surfers, late summer (July-August) is the optimal window, while intermediate surfers may find late spring (May-June) more manageable with slightly smaller but consistent swells.

In October, Ikumi offers surfers a mix of conditions, with an average swell height of 1.1m and a decent period of 9.2s, suggesting mostly clean, organized waves. The most consistent swell direction is from the ESE, accounting for over 30% of waves in the 0.5-2.5m range—ideal for intermediate to advanced surfers. This direction also delivers the largest waves (up to 2.5m+), though bigger sets are rare (only 0.07% of the time). SE and SSE swells also contribute, adding variety with slightly softer waves. Wind conditions are less favorable, with only 15% of days offering ideal offshore or light winds. Northerly and NNE winds dominate, often blowing at 10-30kph, which can create choppy or cross-shore conditions. However, early mornings may provide cleaner sessions before winds pick up. Overall, October is a reliable month for surfable waves, particularly when ESE swells align with lighter winds, but patience and timing are key to scoring the best conditions.