Conditions at Sesimbra in September
September: First Taste of Autumn
September is the hinge month between summer's slumber and autumn's return. Average surf is still modest at 3.5ft (1.1m), but the period stretches to 10.5s, and the wind is ideal a promising 50% of the time - the highest of the year. The swell rose is still dominated by NW at 50% and WNW at 32%, but the size distribution shifts up slightly, with more waves in the 1.5-2m class. At Sesimbra, early autumn low-pressure systems start brushing the Iberian coast. Water temp peaks at 18.2°C, air temps are warm at 20°C, and rain is still light. The first SSW/SW swells of the season become more frequent, and those are the ones that make the bay light up before the big winter push.
Average Spot conditions at Sesimbra in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Sesimbra 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 Sesimbra for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sesimbra 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 Sesimbra.