Conditions at Hokkaido in September
September: The Sweet Spot of the Hokkaido Year
September is the standout month. The average height is still only 2-3ft (0.9m), but the period is a solid 8.6s and ideal wind conditions hit 19%, the highest of the year. The swell rose is built on SSE (44.3%) and SE (29%) energy, with S adding 10.4%; that is exactly the direction window for this SSW coast. Crucially, the autumn transition brings more frequent NNW/N winds as the Siberian High begins to rebuild, so the lineups are cleaner between the onshore pulses. Typhoon remnants can also generate 5-8ft (1.5-2.5m) pulses, especially in the second half of the month. Water temp is still a pleasant 19.5°C, making September the best combination of power, direction and comfort all year.
Average Spot conditions at Hokkaido in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Hokkaido during September. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Hokkaido for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Hokkaido for September. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Hokkaido.