Thorli - surf spot statistics

Best Surf Season (October – March)

The North Atlantic roars to life during these months, with average swell heights consistently above 2.4m and long periods averaging 9.8 to 11.7 seconds. Dominant swell directions from the SW, SSW, and S quadrants pound the Icelandic coast, and when a southwest wind sets in – the golden offshore here – Thorli transforms into a powerful, long-period playground. The climatological ramping up of extratropical cyclones across the North Atlantic drives this surge, bringing pumping head-high to double-overhead sets. Still, the window of perfect conditions is narrow: ideal wind only blows 11–14% of the time, so patience and a keen eye on synoptic charts are crucial to score the best days. When the low-pressure systems align with a stable high to the west, expect epic, heavy waves in the 1.5–2.5m range with periods over 10s.

Fair Surf Season (April – June & September)

As the North Atlantic storm track begins to weaken in spring, Thorli sees a gradual drop in average swell height, from 2.4m in April down to 1.5m by June. Wave periods also shorten, falling from 9.7s to 8.8s – still rideable, but lacking the raw power of winter. However, the percentage of ideal offshore wind rises to 19–38%, offering more frequent clean sessions. Swell directions remain dominated by the SW through SSE quadrants, with a notable increase in SE and SSE swell, which can wrap in nicely. The wave heights during this period are mostly in the fun-sized 0.5–1.5m range, perfect for groveling and turning tricks. September marks a transition month, with average swell climbing back to 2.1m and periods to 9.4s, while ideal wind drops to 22% – a taste of the coming winter.

Low Surf Season (July – August)

July and August represent the true summer lull for Thorli. Average swell heights bottom out at 1.4–1.5m, and wave periods stagnate around 8.2–8.5s – marginal for any real power. The swell is dominated by shorter-period windswell from the SW through SSE quadrant, mostly under 1m. On the bright side, offshore winds blow a generous 34–39% of the time, making for cleaner but smaller conditions. Expect micro to small, fun-sized waves (<0.5–1m) on most days. Occasionally a remnant groundswell from a distant storm can push in, but those are rare. This is the season for longboard cruises and fin-tuning your flow, not for charging.

August: Late Summer Consistency with Building Swell

August holds onto the summer pattern but shows subtle signs of autumn awakening. Average swell height stays low at 1.5m, period at 8.5s, but the distribution hints at larger bursts from the SW (21.5%), SSW (15.6%), and S (11.4%). The percentage of ideal wind remains high at 34%, with light offshore breezes common. Winds from the offshore quadrant account for over 50% of the total wind, making for frequent clean days. Swell height is predominantly in the 0.5–1.5m range, but there are more events with 1.5–2m (5.3% from SW alone). This month can surprise with a late-summer groundswell from a distant storm spinning up in the Atlantic. When that happens, Thorli offers peaky, rippable waves under sunny skies – a classic August sleeper.