Conditions at Troia in September
September: Autumn's First Long-Period Hints
September is the light at the end of the summer tunnel. Average swell height is still only 3.5ft (1.1m), but the average period jumps back to 10.5s, and you can feel the North Atlantic starting to wake up. NW remains the dominant swell direction at 50.4%, with WNW at 31.6%, but true W swell returns to 8.9% and WSW/SW make a small comeback (4.0% combined). More importantly, a bigger percentage of waves fall into the 3-5ft (1-1.5m) and 5-6.5ft (1.5-2m) bands than in July or August.
Wind quality also improves. Ideal conditions reach 35%, and while the NNW flow still leads at 30.7%, the offshore NNE/NE/ENE/E sector is more present (around 9%). Water temperature is at its annual max of 18.2°C, air temps average 21.5°C, and precipitation climbs slightly to 0.95mm/day. It is still inconsistent, but the first real groundswell pulses of autumn make September a worthwhile transition month.
Average Spot conditions at Troia in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Troia 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 Troia for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Troia 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 Troia.