Conditions at Shonan in August
August: Longer-Period Southern Pulse, but Wind Still Bites
August brings the most interesting swell periods of the summer. The average wave period jumps to 9.3s, which puts Shonan on the threshold of powerful, long-period surf, and the average height ticks up to 2.6ft (0.8m). The swell directions are again ideal: S (32.0%), SSE (28.4%), SSW (19.5%) and SE (11.5%). Much of this is typhoon-forced energy from the open Pacific, and when it arrives in the dark hours it can produce surprisingly punchy chest-high waves. But the wind is still the spoiler. SSW (21.4%), SW (12.7%) and S (15.1%) dominate the surface while ideal offshore wind sits at only 14%. Water temperature peaks at 26.5C with air at 25.6C and precipitation at 4.73mm/day. August is a month of occasional great waves in a sea of onshore chop; keep an eye on tropical storm tracks and hope for a late-season N-NNE push.
Average Spot conditions at Shonan in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Shonan during August. 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 Shonan for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Shonan for August. 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 Shonan.