Conditions at Seinesodden in September
September: Autumn's First Real Groundswell
September is a genuine reawakening for surf at Seinesodden. Average swell height jumps back to 4ft (1.2m) and the mean period climbs to 9.3 seconds, bringing more organised groundswell. The swell rose is again dominated by WSW at 28.4% and W at 17.7%, with WNW at 10.7%, NW at 7.6% and NNW at 6.0%. The largest growth is in the 1-2m range, so waves begin to show real shape. Wind patterns shift back toward winter: ESE and SE both reach 11.3-11.4%, SSE adds 5.8%, and the total offshore flow approaches 34.8%. Ideal surf wind occurs 43% of the time, giving you far more rideable sessions than in summer. With air temperatures averaging 7.2°C, precipitation at 5.44 mm/day and water temperature still a pleasant 12.0°C, September is one of the most comfortable months to surf while the North Atlantic starts to wake up.
Average Spot conditions at Seinesodden in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Seinesodden 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 Seinesodden for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Seinesodden 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 Seinesodden.