Conditions at Niijima in August
August: Typhoon Season Heats Up
August is the turning point of the Niijima year. The average height is still modest at 1.4m (4-5ft), but the average period jumps to 9.0s - the highest of the calendar - and ideal wind reaches 25%, the best annual percentage. Distant typhoons and early autumn tropical systems begin to lay down longer-period ENE, ESE and SE swell, with the optimal quadrant at 35.6%: SE at 14.9%, ESE at 10.5%, and E at 6.9%. The south-southeast window is broad and alive.
Winds favor the offshore westerlies: WSW 18.0% and SW 16.5%, with NE and ENE onshores at 19.2%. The 9s period is the start of real groundswell, and when a typhoon sits south of Japan and pushes 2-3m (6-10ft) E/SE swell while a WSW offshore breeze cleans the break, August can absolutely pump. Water temp peaks at 27.4C, air averages 26.6C, and rain drops to 4.75 mm/day - summery but less wet. Throw a groveler in the car and keep the step-up ready; the first XL windows of the season are closer than they look.
Average Spot conditions at Niijima in August
Swell history for August
Wind history for August
Swell quality
Analyze the groundswell consistency at Niijima 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 Niijima for your next trip in August.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Niijima 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 Niijima.