Conditions at Omaezaki in September
September: The Jewel of the Year - Big Waves, Better Winds
September is the month to circle on the calendar. The average swell height reaches 1.4m, the period ties its peak at 9.2s, and the combination of lingering typhoon energy and early autumn fronts starts producing serious groundswell. ESE (19.7%), SE (17.0%) and SSE (14.1%) lead the swell rose, but the S (13.0%) and SSW (10.0%) windows are active enough to hit the beach properly. Large pockets of 1.5-2m and 2-2.5m energy from the S/SSW directions mean there are legitimately pumping days on offer.
Wind is also beginning to improve. Ideal wind hits 22%, and although ENE (23.9%) and E (16.4%) are still dominant, the increasing WNW and NW signals hint at autumn's strengthening offshore regime. With air at 25.0°C and water at 25.7°C, September offers the best balance of warm weather, powerful swell and occasional clean conditions. Rain remains high at 7.98mm/day, so chase the windows.
Average Spot conditions at Omaezaki in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Omaezaki 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 Omaezaki for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Omaezaki 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 Omaezaki.