Mirleft - surf spot statistics

Best Surf Season (October - March)

The North Atlantic roars to life during these months, and Mirleft's northwest-facing shores bear the brunt of the winter fury. Powerful extratropical storms spinning off the US East Coast and Greenland send consistent, long-period swell from the NW-NNW quadrant, with average heights hovering around 2m and periods often exceeding 12s. The crucial ingredient? Offshore winds from the south to southwest quadrant blow clean across the points, with ideal wind frequency peaking at 51% in December. This is prime time for Mirleft, when the combination of solid swell and glassy conditions aligns for epic sessions.

Fair Surf Season (April & September)

As the seasonal transition takes hold, the swell machine slows down but doesn't shut off. April sees a drop to 21% ideal wind as the trade wind pattern strengthens, but residual winter energy still delivers average 1.9m swell at 10.9s, dominated by NNW swell. September offers a taste of the upcoming winter with a bump in period to 10.1s and 24% offshore wind chances. These months are for the dedicated surfer willing to navigate inconsistent windows, but the rewards can be clean, fun-sized waves.

Low Surf Season (May - August)

Summer brings the Azores High pressure system firmly over the region, suppressing storm activity and shifting the wind regime. Swell direction becomes overwhelmingly NNW (65-96% of all swell), but heights drop to 1.4-1.5m and periods shorten to 8-9s – typically weak, short-period windswell. Worse, the wind is predominantly onshore from the N-NW, with ideal offshore wind chances plummeting to between 11% and 21%. Mirleft becomes a shadow of its winter self, with small, choppy conditions that rarely inspire. Kite and windsurfers may find their element, but surfers should look elsewhere or wait for winter.

April: Transitional Trade Winds

April marks a sharp transition: ideal wind plummets to 21% as the trades strengthen. Swell height drops slightly to 1.9m and period shortens to 10.9s. Swell direction remains NNW-heavy (46.7%), but NW is still significant (27.9%). The challenge is the wind – NNW onshore winds dominate 28.7% of the time, often accompanied by moderate strength. However, early mornings can still deliver glassy conditions with a light southerly breeze before the trades ramp up. If you catch a synoptic pattern with a low-pressure system lingering off Portugal, expect a last taste of long-period NW swell under offshore winds.