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.

In April, Hokkaido's surf spot offers mostly small to mid-sized waves, with an average swell height of 0.7m and a decent period of 8.0s. The most consistent swell direction comes from the southern quadrants, with SSE and SE swells dominating and occasionally producing rideable waves in the 1-1.5m range. However, the majority of waves fall under 1m, limiting ideal conditions for advanced surfers. Wind conditions are challenging, with only 11% of the time providing favorable offshore or light cross-shore winds (typically from the west or northwest). Stronger onshore winds from the south and southeast are frequent, often exceeding 20kph, which can ruin wave quality. While there are occasional clean days, the spot is generally inconsistent in April, best suited for less demanding sessions or longboarding when smaller swells align with lighter winds.