Conditions at Carrownisky in September
September: The Autumn Switch Flicks On
September is the pivotal month when Carrownisky begins waking up from its summer sleep. The average swell height rises to 4ft (1.2m) and the average period lengthens to 9.9s, approaching the powerful band. The swell rose shows W (25.3%), WNW (20.6%) and WSW (14.7%) all contributing solid chunks of energy, with an increasing number of waves in the 3-6ft (1-2m) range. The first proper low-pressure systems of autumn send groundswell across the North Atlantic, and the west-facing beach starts to feel alive again. Wind is still a lottery: ideal offshore flow occurs 16% of the time, while SSW, SW and WSW winds keep many sessions onshore. But with water temperature still comfortable at 15.3°C (60°F) and air temperatures averaging 13.8°C (range 6.5 to 21.9°C), September offers an increasingly punchy and comfortable introduction to the best season. Start watching the charts closely - the magic starts here.
Average Spot conditions at Carrownisky in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Carrownisky 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 Carrownisky for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Carrownisky 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 Carrownisky.