Conditions at Sele in September
September: Autumn Engine Warms Up
September is when the North Atlantic wakes from its summer slumber. Average wave height rises to 1.0m (3ft), the period lengthens to 7.1s, and the ideal wind window improves to 9%. Swell directions become better balanced: NW is still strong at 16.3%, but W and WNW both post 13.8%, with WSW at 10.1% and SW at 10.3%. The increasing western component means more waves are actually hitting Sele's optimal exposure, and the energy is slowly starting to develop some groundswell character.
The wind remains predominantly NNW at 19.6%, limiting how often conditions are truly clean. Still, the return of SE (10.9%) and SSE (10.1%) means there are more opportunities for sideshore and offshore mixes, and the first true autumn low pressure systems can bring welcome W-SW pulses. Sea temperature is still pleasant at 15.1°C, air averages 12.7°C, and rainfall is on the rise at 5.27 mm/day. September is a keeper month for savvy surfers: there is already some decent swell, without the punishing winter cold.
Average Spot conditions at Sele in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Sele 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 Sele for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Sele 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 Sele.