Conditions at Katagai in August
August: Peak Typhoon Season and Heavy Tropics
August is the most typhoon-prone month, and you can see it in the numbers: SE swell accounts for 27 percent of all wave energy, with S/SSE/ESE fillers making the east-southeast window the dominant source. The average period jumps to 9.2s, reflecting tropical storm and typhoon groundswell pushing through the Philippine Sea and into the Japanese coastline. Yet the wind remains the limiting factor - only 23 percent of the time is truly offshore, and SSW/SW winds frequently accompany those tropical systems, turning potentially epic swells into stormy, onshore messes. The water is at its warmest, around 24.2°C, so the rare clean day with a typhoon swell will be worth every minute of waiting.
Average Spot conditions at Katagai in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Katagai 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 Katagai for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Katagai 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 Katagai.