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Mejillones - surf spot statistics
Mejillones seasonal overview
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.
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Conditions at Mejillones in July
July: The Doldrums
July is the absolute low point for surf at Mejillones. The average swell height is 1.6m – deceptive because it comes mostly from short-period (7.7s) windswell. The swell rose shows a massive 46.6% from N and 25.6% from NNE, both directly onshore directions. The wind situation is dire: N winds blow 28.1% and NNE winds a staggering 65.5%, with zero percent ideal offshore wind. Any waves in the water are choppy, messy, and almost impossible to surf clean. Even the rare NW swell that wraps in (only 0.2%) is ruined by the constant onshore flow. This month is best saved for hiking or exploring.
Average Spot conditions at Mejillones in July
Swell history for July
Wind history for July
Swell quality
Analyze the groundswell consistency at Mejillones during July. Based on historical data, there is a % probability of groundswell occurring this month. The chart below provides a detailed breakdown of the average wave height distribution, offering deep insights into the swell quality and surf potential you can expect at Mejillones for your next trip in July.
Ground swell
Ground swell by size
Wind conditions
Evaluate the wind and swell alignment at Mejillones for July. Our analysis shows that favorable offshore or side-shore winds coincide with surfable swell approximately % of the time. The accompanying graph illustrates the average size distribution of waves during these optimal wind windows at Mejillones.