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.

July in Hokkaido offers modest surf conditions with an average swell height of 0.6m and a decent period of 8.7s, suggesting some organized but generally small waves. The swell distribution shows that the majority of waves come from the SE to SSE directions, with the most rideable conditions falling in the 0.5–1.5m range. Larger waves (1.5–2.5m) are rare but not unheard of, primarily from the SE and SSE. Wind conditions are less favorable, with only about 10% of the time being ideal for surfing. The dominant winds blow from the SE to S quadrant, often in the 10–30kph range, which can create choppy or onshore conditions. While clean sessions are possible, surfers should expect a mix of smaller, weaker waves and occasional wind-affected days, making July more suitable for beginners or those willing to hunt for the cleaner windows.