Conditions at Ikumi in September
September: The Transition To Something Better
September is the hinge of the year. The average period climbs to 9.3s and average swell height holds at 3.3ft (1.0m), while the favourable ESE direction strengthens sharply to 22.9 percent, and the complete NE-ESE window totals 25.4 percent. The swell is still heavily weighted toward SE (29.0 percent) and SSE (22.1 percent), but the equatorial and typhoon-driven ESE pulses bring genuine, long-period energy. The fly in the ointment is the wind. The NNE flow balloons to 19.7 percent, NE accounts for 12.4 percent, and ENE/E add more, pushing the ideal wind percentage down to 23 percent. Onshore and cross-shore winds therefore spoil many of the incoming ESE swell trains. Still, when a high-pressure ridge positions itself offshore and the wind gets a westerly component, September can produce the best surf since April. Sea temperature is warm at 26.9°C, air averages 25.1°C, and precipitation is high at 8.52 mm/day - the classic, humid tail of typhoon season.
Average Spot conditions at Ikumi in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Ikumi during September. 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 Ikumi for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Ikumi for September. 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 Ikumi.