Conditions at Kilcummin in September
September: First Autumn Pulse
September is the pivot point from summer to autumn. The average swell rises to 1.2m (4ft) and the period lengthens to 10.3s, and you can feel the change in the water. W and WNW are still the dominant sources (26.3 per cent and 32.2 per cent), but NW contributes 15.6 per cent, putting the preferred N-NNW-NW share at around 21 per cent. More importantly, the height distribution contains a healthy amount of 1-2m (3-6ft) waves, and the first long-period W-WNW groundswells of the season can light up the bay. The wind is very cooperative: ideal wind hits 37 per cent, with S-SSW-SW totals around 28 per cent, while N-NNW-NW winds are down to about 17 per cent. Air temps are still mild at 13.8°C, water temp is 15.8°C, and precipitation is 3.83mm/day. This is one of the best quality-to-comfort windows of the year.
Average Spot conditions at Kilcummin in September
Swell history for September
Wind history for September
Swell quality
Analyze the groundswell consistency at Kilcummin 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 Kilcummin for your next trip in September.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Kilcummin 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 Kilcummin.