Hokkaido - surf spot statistics

Hokkaido’s surf conditions are heavily influenced by seasonal wind patterns and swell consistency. The best months for surfing are generally from August to October, when ground swell percentages peak (13% in August and September, 12% in October) and wind conditions are relatively better (12-14% good wind days). These months also offer the most consistent swell presence, with "no swell" days dropping to 41-42%, and mean swell sizes hovering around 0.7m—modest but surfable for experienced riders. Early spring (March-April) shows a slight uptick in ground swell (8-9%) and manageable wind conditions (9-11% favorable), though wind interference remains high (89-91% bad wind days). Winter months (November-February) are challenging, with low ground swell (4-7%), frequent poor winds (93-94%), and a high percentage of no-swell days (44-56%). Summer brings mixed results—July and August see improving ground swell, but June is inconsistent. Overall, late summer and early autumn provide the most reliable conditions, while winter is largely unfavorable due to onshore winds and weak swell. Surfers should prioritize August-September for the best balance of swell and wind.

May in Hokkaido offers inconsistent but occasionally surfable conditions. The average swell height is small at 0.7m with a decent 7.9s period, suggesting some potential for clean but weak waves. The swell direction is primarily from the south, with SSE and SE contributing the most to rideable waves (1-1.5m range at ~26% and ~14% respectively). However, the majority of swells are under 1m, limiting ideal surf days. Wind conditions are challenging—only 11% of the time is favorable, with lighter winds mostly from the E to SSE. Stronger winds often come from southern directions (SSE, S, SSW), which may create onshore chop. For surfers, patience is key; the best sessions will rely on a rare combination of SSE/SE swells over 1m paired with lighter ENE or E winds. Expect mostly small, inconsistent surf with occasional clean days.