Conditions at Oniguchi in August
August: Typhoon-Powered Mix
August brings the peak of typhoon season and the longest average period of the summer at 8.2s. Average swell height is 1.1m (3.5ft). The direction mix is more varied than July: ESE is 18.1%, SE is 13.3%, SW is 11.0%, WSW is 9.7%, E is 9.5% and SSW is 8.8%. Ideal wind improves slightly to 30% of the time, with E at 10.6% and ESE at 11.0% providing occasional offshore to cross-offshore flow. Air temperature peaks at 28.1°C, water temperature reaches 28.8°C, and precipitation drops to 6.88 mm/day. The key to August is tropical cyclone placement. A typhoon tracking west or southwest of Japan can send a powerful SSW/SW pulse into Oniguchi, and when the wind snaps offshore, the waves turn from messy to genuinely fun. But the default conditions remain warm, humid and wind-affected.
Average Spot conditions at Oniguchi in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Oniguchi 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 Oniguchi for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Oniguchi 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 Oniguchi.