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.

October: Winter Prelude – Building Swell and Fickle Winds

October sees a sharp increase in average swell height to 2.4m and period to 9.8s. The Atlantic storm machine is revving up, with swell primarily from SW (10.1%), SSW (7.5%), and S (6.9%), plus a significant ESE component (5.2%) that can bring eastern swell into the equation. Ideal wind drops to 14%, similar to midwinter. The wind rose shows a dominance of NE (11.3%) and NNE (14.1%) winds, which are onshore and ruin the surface. However, when a deep low passes to the southeast of Iceland, a tight pressure gradient can deliver strong NW winds that are offshore for Thorli. These windows are brief but can produce pumping 1.5–2.5m waves with long period (10–14s). This is a month for the dedicated surfer who watches the weather models closely and jumps on the rare clean windows.