Conditions at Les Cavaliers in September
September: The Autumn Revival Begins
September is the turnaround month. Average swell height climbs back to 1.1m (3-4ft), and the period lengthens to 10.6s, a sign that the Atlantic storm track is starting to re-route toward the Bay of Biscay. The swell is still strongly NW (53.8%) and WNW (33.3%), but more energy arrives in the 1-1.5m (3-5ft) range, with the first meaningful 1.5-2m (5-6ft) pulses (6.0% from NW and 4.7% from WNW). Offshore wind windows improve to 29%, with E/ESE/SE/SSE flow around 20%, though onshore wind still dominates 47% of the time. Water temp remains warm at 20.8°C, and air temps drop to a comfortable 18.9°C. The first cold fronts of the season can swing through, bringing a day or two of fresh NW groundswell. If the low-pressure track aligns with an Azores high ridge, September can offer glassy, long-period surf with warm water - one of the best combinations of the year.
Average Spot conditions at Les Cavaliers in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Les Cavaliers 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 Les Cavaliers for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Les Cavaliers 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 Les Cavaliers.