Conditions at Contreiras in September
September: The Autumn Ignition
September is the month when Contreiras starts to come back to life. Average swell height is 1.6m (5.2ft), but the average period climbs to 10.5s, signalling the return of more organized groundswell. The direction is perfect for the spot: NNW dominates at 40.4 percent, with N at 13.8 percent, NNE at 16.7 percent and NW at 16.7 percent. The 1-2m (3.3-6.6ft) range is well represented, and the longer-period pulses are punchier than the summer slop. Wind quality improves significantly, with NNE down to 28.7 percent and NE at 20.3 percent, while the SSW-SW-WSW-W offshore quadrant becomes more active; ideal wind conditions are back up to 18 percent. This combination makes September an excellent transition month, especially after a frontal system brushes the Atlantic side and cleans the swell up. Air temperatures are still warm at 19.5-25.7°C, water temperature peaks at 23.7°C, and precipitation rises only slightly to 0.51mm/day. It is still board-shorts weather in the water, but the ocean is beginning to whisper that winter is on the way.
Average Spot conditions at Contreiras in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Contreiras 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 Contreiras for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Contreiras 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 Contreiras.