Conditions at Kugenuma in August
August: Typhoon Season Stirs the Pacific
August is the first month to show real signs of recovery. The average period jumps to 9.3s - the highest of the year - and the average height ticks up to 0.8m. Swell directions are still firmly south: S (32.0%), SSE (28.4%) and SSW (19.5%), but now more of those waves arrive in the 1-1.5m (3-5ft) range, especially from the S and SSW. Typhoons spinning across the western North Pacific are the engine; they send long-period southern energy into Sagami Bay even when they remain offshore. The wind is still predominantly adverse - SSW at 21.4%, S at 15.1% and SW at 12.7% - but NNE (12.1%), NE (8.9%) and N (2.6%) keep the door open for clean windows. The ideal-wind frequency sits at 15%. With water peaking at 26.5°C and air averaging 25.6°C, this is tropical surf territory. The key is tracking tropical cyclones: a typhoon passing to the south or east can deliver the best surf of the summer, provided the wind flips offshore before the swell peaks. If it does not, Kugenuma turns into a big, bumpy mess.
Average Spot conditions at Kugenuma in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Kugenuma 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 Kugenuma for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Kugenuma 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 Kugenuma.