Conditions at Gruissan in September
September: First Autumn Flickers
September brings a subtle turning point. Average height is still small at 2-3ft (0.6-0.9m) and period remains short at 4.5s, but ideal wind improves slightly to 15%. More importantly, the E/ESE/SE/SSE swell directions jump to nearly 42% of the total, with ESE, SE and SSE each registering meaningful frequencies in the 1-2m range. These are the first pulses of autumn low pressure beginning to push across the western Mediterranean. The NW/WNW offshore flow remains the dominant wind regime, and when an early E/SE swell lines up with a light land breeze, Gruissan can offer surprisingly fun, rippable peaks. Water temperature is still warm at 21.0°C, air temps average 20.0°C, and precipitation increases to 1.73 mm/day as the season transitions.
Average Spot conditions at Gruissan in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Gruissan 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 Gruissan for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Gruissan 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 Gruissan.