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Conditions at Cidreira in September
September: Maximum Size, Frontal Battle Lines
September produces the largest average swell of the year at Cidreira: 6.6ft (2.0m) with an average period of 9.1s. The energy is broad and powerful, led by ENE (17.5%), E (13.7%), ESE (12.1%), SE (11.6%), SSE (10.1%) and S (9.3%). There is no shortage of size - many waves sit in the 6-8ft (1.8-2.4m) range - but the wind becomes the limiting factor again. The ideal wind percentage falls to 15%, and NE (25.1%) plus ENE (16.7%) dominate a stronger trade-wind regime, with 30-40kph gusts increasingly common. Cold fronts still pass through, generating SW (6.8%) and W (4.5%) winds, but the recovery windows are shorter than in May-July. Air temps average 16.8°C and water temp is 16.7°C, with the wettest month reaching about 5.0mm/day. For experienced surfers, the post-frontal days can be pumping; for the rest of the time, expect sizeable but lumpy surf.
Average Spot conditions at Cidreira in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cidreira 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 Cidreira for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cidreira 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 Cidreira.