Barra de Potosi - surf spot statistics

Best Surf Season (June - September)

The summer months bring the most reliable combination of consistent, long-period swell and favorable offshore winds to Barra de Potosi. From June through September, the percentage of ideal wind (blowing from W, WSW, SW, SSW) climbs to 40-48%, thanks to the strengthening of the Pacific high and the thermal low over mainland Mexico. This creates a dominant wind flow from the west and southwest, which, according to our criteria, blows offshore and polishes the wave faces. Meanwhile, the swell remains steady at 1.4-1.5m on average, with long periods around 13-14 seconds. The swell direction is predominantly from the south (SSW/SW) – not the optimal west-northwest direction – but these south swells wrap into the bay, producing clean, rippable lines that peel beautifully along the beach. It's the sweet spot of the year for consistent surf.

Fair Surf Season (October - November & April - May)

These transition months offer a mixed bag. In April and May, the swell picks up to 1.3-1.4m with long periods (14s), but the ideal wind percentage drops to 9-13%, meaning a higher chance of onshore winds from the north and northwest that can chop up the surface. October and November see a rebound in ideal wind (27-40%) as the trade winds weaken, but swell heights dip slightly (1.2-1.4m). The overall window for good surf narrows, but when the stars align – a fresh south swell meeting light offshore southwest winds – you can score excellent, punchy waves. Patience and careful timing are key.

Low Surf Season (December - March)

Winter is the most challenging time for surfers at Barra de Potosi. The average swell height drops to 1.0-1.2m, and although periods remain long (13-13.7s), the wave energy is less. More critically, the ideal wind percentage falls to a meager 9-23%. The dominant wind direction shifts to the northwest and north – the exact directions that cause onshore conditions, ruining wave quality. Occasional west swell sneaks through (5-13% from W), which is the optimal direction, but these events are usually accompanied by strong onshore winds from the same quadrant. The result is a frustrating mix of lumpy, closed-out waves. The few clean days come when a high-pressure system stalls offshore, delivering light offshore easterlies – but these are rare. For most surfers, winter is a time to find a spot protected from the north or wait for the next season.

March: Swell Building, Wind Peaking Onshore

March brings a noticeable bump in average swell height to 1.2m and period to 13.7s, the highest of the year so far. Swell composition shows a dramatic increase in SSW energy (42%) and SW (49%), with a tiny 0.5% from the west. The ideal wind percentage plummets to just 11%. This is the month with the highest percentage of onshore northwesterly winds (20% WNW, 19% W, 16% NW). The waves have power, but the wind is almost always from the wrong direction. On the rare day when high pressure sets up inland and the gradient relaxes, the light southwesterly wind can appear, offering groomed 3-4ft waves with long, clean walls. It’s a month of frustration with occasional gems.