Mejillones - surf spot statistics

Best Surf Season (October - March)

The North Atlantic roars to life during these months, delivering a consistent barrage of powerful, long-period swell to Mejillones' north-northwest facing beach. With average wave heights hovering between 1.7m and 2.2m and periods often exceeding 11 seconds, the potential for pumping and firing conditions is at its peak. The ideal offshore wind (S to SW) blows with moderate frequency, especially in December (23% ideal) and January (19%), creating clean, glassy faces when the synoptic setup aligns. This is undoubtedly the prime window for scoring the best waves of the year.

Fair Surf Season (April & September)

Transitional months like April and September offer a mix of fading winter swell and building autumn energy. Average heights drop to around 1.4-1.9m and periods shorten to 10-11 seconds, but quality windows still present themselves when a late-season low or early-season hurricane sends a clean NW swell. Ideal wind frequency drops to 5%, making these months more of a gamble. However, when conditions align, you can still find fun-sized waves with less crowd pressure.

Low Surf Season (May - August)

Summer brings a drastic reduction in surf potential. The North Atlantic storm track shifts north, producing negligible long-period groundswell. Average heights remain around 1.4-1.6m, but periods slump to 7.7-9.5s, resulting in predominantly choppy, messy wave conditions. Dominant winds shift to strong northerly quadrants (NNE, NE) that blow directly onshore, ruining any semblance of shape. Ideal offshore winds are nearly nonexistent (0-2% of the time). These months are best left for other activities unless a rare tropical system aligns perfectly – a true low surf season.

April: Transition and Opportunity

April marks a noticeable transition. Swell averages fall to 1.9m and period drops to 10.9s – still average to punchy. The directional distribution remains favorable with NNW at 47.3% and NW at 16.7%, but the wind becomes increasingly problematic. Ideal offshore wind drops to a mere 5%, while NNE winds surge to 36.8% and N winds to 20.8%, both onshore. The result is a month where good conditions are fleeting but not impossible. A late-season storm in the North Atlantic can still deliver a pulse of solid swell, and if the wind gods cooperate, you might score a gem before the summer lull.