Conditions at Airport in September
September: The Cleanest Month
September is often the pick of the year at Airport. The swell is still full: 6-7ft (2.0m) on average with a 14.3s period, and the direction has rotated further west to a very favorable SSW/SW mix. SSW supplies a dominant 70.9% of the energy, S only 11.3%, SW 3.4%, and SSE a trace. That means more of the groundswell is angled directly into the local reef and sandbars, producing heavy, rippable walls with serious push. The wind regime is the cleanest of the entire year: ESE (36.6%), SE (37.5%) and SSE (12.9%) combine for an ideal-wind score of 77%, with more light-to-moderate flow and fewer strong-wind days.
Air temperatures are on the rise again at 24.4°C, water is near its annual minimum at 26.8°C, and rainfall stays low at 1.14mm/day. September is the sweet spot for surfers who want big Southern Ocean groundswell without the rough, windblown edges of the mid-winter peak.
Average Spot conditions at Airport in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Airport 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 Airport for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Airport 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 Airport.