Conditions at Cap Gris-Nez in September
September: Autumn's First Breath
September marks a turning point. Average swell height climbs back to 2ft (0.7m), period ticks up to 4.9s, and the north window remains a solid 35% of the wave rose. NNE (10.9%), NE (12.1%) and NNW (5.7%) all show slightly more 3-5ft (1-1.5m) and 5-6.5ft (1.5-2m) readings than the summer months. Wind distribution is still summer-like, with WSW (16.4%) and SW (12.4%) in charge, but the offshore S/SSW/SW share improves and ideal-surf frequency reaches 6%. Water is still warm at 17.8°C, air averages 15.8°C, and precipitation picks up to 2.13mm/day. September is the month to start watching the Atlantic again: the first true low pressure systems of the autumn can line up a NNW swell with a light south wind, giving Cap Gris-Nez its first real surf since spring.
Average Spot conditions at Cap Gris-Nez in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Cap Gris-Nez 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 Cap Gris-Nez for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Cap Gris-Nez 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 Cap Gris-Nez.