Sao Lourenco - 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 generated by intense extratropical storms. Average wave heights range from 2.0m to 2.6m, with periods frequently exceeding 11 seconds, often reaching 12-13s — that's pumping, heavy surf. The dominant swell directions are from the WNW, NW, and NNW, which funnel directly into the spot's West-North-West exposure, producing clean, lined-up waves. Frontal passages often shift winds to favorable offshore directions (east to southeast), yielding ideal conditions about 20-25% of the time. Expect solid head-high to double-overhead sets, with occasional XL swells pushing past 2.5m. This is prime time for committed surfers chasing quality.

Fair Surf Season (April & September)

Spring and early autumn offer transitional windows with some quality waves. April sees the last pulses of winter energy, averaging 2.0m at 11.1s, with a focus on WNW-NW swell. The wind becomes more variable — ideal conditions drop to 13% — but clean, fun-sized days still occur. September marks the beginning of the autumn ramp-up, with average swell height at 1.6m and periods climbing back to 10.5s. Stronger storm activity in the North Atlantic starts to build, while wind patterns shift, offering occasional offshore windows (12% ideal). Expect fun, rippable waves, but consistency is lower than winter.

Low Surf Season (May - August)

Summer ushers in a persistent lull. Swell heights drop to 1.4-1.7m with periods shrinking to 8.5-9.9s, resulting in choppy, average conditions. The dominant swell shifts to NNW to NW, often generated by weaker distant storms or local windswell. The wind regime becomes dominated by strong northern trades (N, NNW) blowing 20-40 kph, which create onshore, bumpy surf and ruin quality. Ideal offshore wind is a rare commodity, occurring only 3-9% of the time. Waves are mostly small, groveling and messy, best left for longboards or smaller crafts. On the rare occasion when high pressure settles over the Bay of Biscay, light easterly winds can clean things up, but those days are few and far between.

March: Late-Winter Gold

March marks the tail end of the prime season, with averages still solid at 2.3m height and 12.3s period. The dominant swell directions shift slightly — NW (24.5%) now leads over WNW (18.3%), reflecting the seasonal transition. Waves in the 1.5-2.5m range are abundant, but XL events become less frequent. The wind regime sees a notable increase in N flow (22.0%), often strong (20-40 kph). This creates more side-offshore conditions that can still produce clean faces, but the percentage of ideal wind drops to 18%. Nonetheless, March offers a great mix: consistent, powerful swell from reliable sources, with moderate winds that often groom the waves. For those willing to endure a bit of chop, the rewards can be rippable and fun.