Portrush - surf spot statistics

Best Surf Season (October - March)

The North Atlantic roars to life during these months, with average swell heights consistently over 1.8m and long periods of 10-12s. Powerful extratropical storms track across the Atlantic, sending consistent W to NW swell into Portrush's northwest-facing beaches. However, the trade-off is the prevalence of onshore winds from the west and northwest, which can ruin wave quality. Still, when a strong high-pressure system settles over the British Isles or a low tracks just right, the region can see offshore winds from the south and southwest combining with pumping, clean swell. That is when Portrush truly shines.

Fair Surf Season (April & September)

These transitional months see a drop in average swell size (1.4-1.5m) and period (9.3-9.7s), but a noticeable increase in the frequency of favorable offshore winds (16-18% ideal). The swell energy is more moderate but often punchy, and the wind tends to back off, offering more clean sessions. Spring and early autumn can deliver fun, rippable waves with less crowd pressure.

Low Surf Season (May - August)

Summer brings the smallest swell of the year, averaging just 1.0-1.2m with periods around 8-9s. While the percentage of ideal offshore wind climbs to 18%, the swell source is weak – often just local windswell or very long-period groundswell from distant lows. Most days are small but can be fun on a log or groveler. The predominant wind shifts more to the north and northeast, which can be cross-shore or even offshore, but the lack of size keeps the energy low. Consistent, clean small waves are the norm, not the exception.

August: Faint Signs of Life

August is a month of slight recovery: average swell height inches up to 1.1m, and period to 8.3s. W (28.2%) and WNW (31.3%) swells still dominate, but there's a marginal increase in size, with a bit more in the 1-1.5m range. The wind stays favorable at 18% ideal, with a good mix of S (7.3%), SW (8.7%), and SE winds keeping the surface clean. Late August can see the first pulses of Southern Hemisphere or tropical-origin swell sneaking in as long-period energy. While not huge, these pulses can offer the first proper waves of the summer. Keep an eye on distant storms – Portrush can still surprise with a fun, clean day.