Conditions at Costa da Caparica in September
September: The Autumn Switch Is Flicked-Chop Returns to Order
September is where the year starts turning again. The average swell height remains a modest 1.1m (3-4ft), but the average period climbs to 10.5 seconds, signaling the return of true groundswell. The swell rose is still NW-heavy at 50%, with WNW at 32%, but W and WSW are beginning to chip in. Wind quality improves notably, with ideal conditions for 36% of the month-a big jump from the summer months-even though NNW still leads the pack at 43%. Early autumn lows and occasional tropical systems send first pulses toward Portugal, and the balance between clean offshore mornings and afternoon nortada becomes more even. Water temperature peaks at 18.4°C, air averages 19.9°C and rain is still low at 0.89 mm/day. It is a great month to watch the long-range charts; the first solid W swell of the season can easily set up a classic 4-6ft (1.2-1.8m) session.
Average Spot conditions at Costa da Caparica in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Costa da Caparica 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 Costa da Caparica for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Costa da Caparica 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 Costa da Caparica.