Conditions at Il Castello in September
September: Autumn's First Signs
September brings a slight pulse of energy back to Il Castello. Average swell height creeps up to 0.6m (2ft), the period moves marginally to 4.3s, and ideal winds improve to 12%. The swell direction becomes more balanced: WSW leads at 15.0%, S follows at 14.4% and SW at 11.9%, with SSE at 10.6%. More importantly, the percentage of 1-1.5m (3-5ft) WSW swell increases, and some 1.5-2m (5-6.5ft) readings (1.5%) start to reappear. The wind rose becomes more interesting as NNE (8.5%) and NE (8.4%) fight with onshore SSE (8.2%) for dominance, meaning there are occasional clean windows before the next front arrives. Water is still warm at 23.2°C (73.8°F), air temperature averages 21.9°C, and September rainfall increases to 2.67mm/day. The first real autumn swell of the year can show up late in the month.
Average Spot conditions at Il Castello in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Il Castello 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 Il Castello for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Il Castello 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 Il Castello.