Conditions at Malhao in September
September: The First Hint of Autumn Groundswell
September is the hinge month when the ocean begins to remember how to use the winter storm track. Average swell height is still modest at 1.4m (4.5ft), but average period climbs back to 10.6s, and the first genuine long-period pulses start to appear as the Azores High weakens. NW remains dominant at 55.4%, with WNW at 21.3% and NNW at 11.0%. Ideal wind improves to 20% as the cold fronts begin to reach Iberia and offshore flow becomes more common between the nortada pulses. However, NNW winds still blow 27.9% and NW winds 17.9%, so the summer breeze is not done yet. Air temp averages 21.3°C, water temp is 18.1°C, and rainfall increases to 0.85 mm/day. When a solid west pulse meets an early easterly, September can deliver hidden gems.
Average Spot conditions at Malhao in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Malhao 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 Malhao for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Malhao 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 Malhao.