Conditions at Killer Point in September
September: The Season Begins to Stir
September is a transitional month and an underrated one at Killer Point. The average swell height is the lowest of the year at 1.5m (4.9ft), but the average period climbs back to 10.1s, hinting that the fetch is starting to lengthen again. The direction remains NNW-heavy at 74.0% with NW at 19.0%, but the return of slightly longer periods makes those waves more organized and more enjoyable than the pure summer windswell.
Wind quality also improves. The ideal offshore window rises to 27%, even though NNW 29.7% and NW 20.9% still dominate. Early autumn can produce some excellent sessions as the first North Atlantic lows begin to form and the Azores High settles slightly south. With air temps of 22.2°C, water at a warm 18.4°C and almost no rain at 0.19mm/day, September offers a comfortable bridge between summer slop and winter power.
Average Spot conditions at Killer Point in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Killer Point 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 Killer Point for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Killer Point 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 Killer Point.