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Conditions at Llangennith in September
September: The First Real Return of Autumn Swell
September is a turning point. Average swell height climbs back to 3ft (0.9m) and period improves to 8.1s, and there are noticeably more pulses in the 3-6ft (1-2m) range as the first autumn lows start pushing down from the North Atlantic. The swell rose still shows WSW dominance at 36.7%, but W (24.6%) and SW (8.5%) also deliver energy, and the combined western quadrant remains strong. Wind conditions are mixed: the ideal offshore percentage is 6%, but there are more clean, lighter wind windows between frontal systems. Water temperature is still pleasant at 16.6°C, air averages 15.2°C, and rain increases to 2.97mm/day. This is the start of the shoulder season, and with a little luck you can find glassy conditions and the first real groundswell of the autumn, especially if a hurricane remnant tracks into the eastern Atlantic and sends long-period swells toward Wales.
Average Spot conditions at Llangennith in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Llangennith 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 Llangennith for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Llangennith 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 Llangennith.