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.

December: Peak Winter – Epic Swells and Narrow Windows

December delivers near-peak winter conditions: average swell height of 3.3m and period of 11.2s, rivaling January and February. Swell comes predominantly from SW (6.4%), SSW (6.4%), and S (4.3%), with a growing SE (3.7%) and SSE (3.3%) presence. Ideal wind remains low at 11%, the same as February. The wind pattern is dominated by NE (13.3%) and NNE (12.4%) winds, which are the nemesis of Thorli. But when a high-pressure cell builds over the Norwegian Sea, it can pull in a clean NW wind that perfectly grooms the SW groundswell. These cold, clear days produce epic, heavy surf (1.5–2.5m) with long, powerful lines perfect for charging. December is all about patience and precision: wait for the right wind and you'll be rewarded with some of the most memorable waves of the year.