Foz do Arelho - surf spot statistics

Best Surf Season (November - February)

Winter is the undisputed heavyweight champion at Foz do Arelho. The North Atlantic explodes with a barrage of extratropical cyclones, sending consistent, powerful swell trains directly into the NW-facing beach. Average swell heights hover around 2.5-2.8m with long periods (12-13s) ensuring plenty of punch. The ideal wind window (S through W) is at its most reliable, peaking at 32% in December and 31% in January. When a low-pressure system slides south and a high-pressure ridge builds behind it, expect offshore easterlies to groom the waves into clean, lined-up walls. This is prime time for head-high to well overhead surf.

Fair Surf Season (March, April, October)

Spring and early autumn offer a transitional window with still decent swell but lower odds of perfect conditions. March averages 2.5m with 12s periods, but ideal wind drops to 23% as the northerly trades begin to strengthen. October sees the first robust swells of the season (2.1m, 11s) and a similar 23% offshore window, though infrequent. These shoulder months can deliver great waves if you watch the charts – often a mix of leftover summer groundswell and early winter juice, with lighter winds gracing the lineup. Good, not great, but with fewer crowds.

Low Surf Season (May - September)

Summer brings a dramatic downturn in both size and quality. The Azores High settles in, reinforcing strong, onshore northerly winds (N and NNW dominate over 50% of the time) that mangle the swell. Average heights drop to 1.5-1.8m, periods shorten to 8-10s, and the ideal wind window dwindles to a paltry 4-14%. Swell directions are overwhelmingly from the NNW-NW quadrant, but these waves are often wind-shortened and chopped. Occasional smaller days with light land breezes (rare) can produce fun waist-high corners, but consistent, quality surf is virtually nonexistent. Best to save this period for flat spells or travel.

May: The Summer Doldrums Begin

May sees the transition to summer lull. Average swell height falls to 1.8m, period to 9.9s – the waves lose their long‑period punch. Swell direction is still dominated by NW‑NNW (28.4% NW, 29.9% NNW) but most of the energy is in the 1-2m range. Ideal wind drops to just 13%, with N winds roaring at 28.9% of the time. Onshore northerlies are the norm, creating messy, blown‑out conditions. The rare offshore southerly or westerly can clean things up, but these are infrequent and often light. May is really a groveling month – you'll be hunting for small, clean corners on the south end of the beach when the wind somehow swings offshore.