Conditions at Brandon Bay in September
September: The Autumn Awakening
September is where the season starts to turn. The average swell rises to 4ft (1.2m) and period stretches back up to 10.3 seconds - enough to peel open the bay's sandbanks. The waverose is vibrant: WNW 32.2%, W 26.3%, NW 15.6% and WSW 11.6%. This is the month when the first true North Atlantic lows of autumn begin to form, sending distant groundswell toward Ireland before the winter wind machine turns on. The wind distribution is still mixed, with SW (10.1%), WSW (10.1%) and SSW (9.2%) prominent, while ideal offshore wind sits at 25 percent. Water temperature is a pleasant 15.8°C, air 14.3°C, and rainfall 3.40 mm/day. For every rough, bumpy window there will be a clean, overhead session that hints at the months to come.
Average Spot conditions at Brandon Bay in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Brandon Bay 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 Brandon Bay for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Brandon Bay 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 Brandon Bay.