Foz, Spain, offers consistent surf conditions year-round, but the best months for surfers seeking quality waves and favorable winds are from October through March. During this period, ground swells dominate, providing powerful and well-organized waves, with mean swell sizes ranging from 1.7m in October to 2.3m in January. The highest likelihood of clean conditions occurs in October with 30% good wind conditions, though wind quality remains relatively low overall, rarely exceeding 30%. Winter months like December and January deliver the largest waves (2.1m–2.3m) but also come with the worst wind conditions (73–76% unfavorable). Spring and summer (April–September) see a shift toward wind swells, reducing wave quality, with smaller sizes (1.1m–1.6m) and choppier conditions due to persistent onshore winds. September and November stand out as transition months, offering a balance of decent swell size and slightly improved winds. For advanced surfers prioritizing size and consistency, winter is ideal despite the wind challenges, while intermediates might prefer late autumn or early spring when swells are still respectable (1.7m–2.0m) and winds are marginally better. Avoid summer if seeking powerful waves, as wind swells and smaller sizes prevail.