Conditions at Uliss in September
September: The Autumn Wind Shift Starts to Build
September is a transition month with more mixed conditions. The summer monsoon weakens, and the North Pacific storm track begins to awaken. Wind data becomes a near split: onshore directions (SE, SSE, S, SSW) total about 41%, while the offshore N, NNE, NW, NNW quadrant totals about 37.6%. Swell direction is still dominated by the southern half, with S 21.2%, SSW 18.1%, SSE 12.2% and SE 9.9%, but N 5.9% and NNW 8.0% are also present. The average wave height is only 1.5ft (0.5m) and the average period is 4.8s - the shortest of the year - so most waves are short-period and disorganized. Water is still warm at 19.3°C, air averages 17.5°C, and rain is heavy at 3.04 mm/day. Ideal surf is 5%, yet the month has upside: if a typhoon remnant tracks through the basin, Uliss can see a few fun 3-5ft (1-1.5m) days between wind shifts.
Average Spot conditions at Uliss in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Uliss 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 Uliss for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Uliss 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 Uliss.