Conditions at Bordeira in September
September: The First Signs of Autumn Pulse
September marks a turning point. The average swell height is still modest at 1.5m (4.9ft), but the period lifts to 10.4s - a clear sign that the North Atlantic is starting to wake up. NW remains the dominant swell direction at 47.1%, with NNW (25.5%) and WNW (14.3%) adding plenty of exposed westerly energy. The bigger groundswell events start to push through, especially in the second half of the month.
Wind gets slightly more cooperative too: ideal offshore flow rises to 14 percent, although NNW is still the main player at 41.2%. The key is patience - as the first autumn cold fronts approach, they can drag winds southwest or south and set up Bordeira for clean, warm-water sessions. Water temp is at its yearly max of 19.1°C, air temp averages 21.0°C and rain is still light at 0.75mm/day. September is the best shot at scoring a late-summer swell with your board shorts.
Average Spot conditions at Bordeira in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Bordeira 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 Bordeira for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Bordeira 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 Bordeira.