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Conditions at Portrush in September
September: The Autumn Switch Flickers
September is the turning point. Average swell jumps back to around 5ft (1.5m) with a period of 9.3s, and the autumn low-pressure track starts to line up in the North Atlantic. The swell rose still favours WNW at 26.3% and W at 23.7%, with a solid 9.2% from NW. Ideal offshore wind dips slightly to 16%, but the return of bigger, longer-period energy makes the trade-off worthwhile. Early in the month you can still score clean, warmer-water waves; by the end, the first true groundswell of autumn is knocking on the door.
Water remains pleasant at 14.6°C, air averages 12.5°C, and precipitation climbs to 3.12 mm/day. September is the classic shoulder-season gem.
Average Spot conditions at Portrush in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Portrush 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 Portrush for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Portrush 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 Portrush.