Conditions at Matadouro in September
September: Autumn's First Spark
September is a genuine transition month and the best of the summer shoulder. Average swell height rises to around 5ft (1.6m) and period improves to 10.5s - not winter-class, but enough to make Matadouro interesting. The direction distribution remains very northern: NW (36.0%) and NNW (34.4%) are almost equal, with WNW (15.4%) and W (4.4%) adding some west in the mix. Early autumn low pressures in the North Atlantic are already generating more organized groundswell.
Ideal wind improves to 15% of the time, though NNW (36.0%) and N (15.6%) still rule most days. The afternoons are often blown out by the northerly, but mornings become increasingly glassy. When a high-pressure ridge over the Iberian Peninsula sets up east winds, the combination of a clean offshore flow and a building NW groundswell can produce superb, rippable surf.
Average air temperature is 19.8°C, water temperature 18.2°C, and rainfall is 0.95mm/day. A 3/2mm wetsuit or a springsuit is all that is needed.
Average Spot conditions at Matadouro in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Matadouro 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 Matadouro for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Matadouro 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 Matadouro.