São Lourenco
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Hourly Forecast
Timezone: America/Sao_Paulo
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São Lourenco surf guide

São Lourenco is located between Bertioga and Maresia, offering a 60km (40mi) stretch of surf along the SP055. This spot features small rivermouth formed sandbars that create deeper channels. It's generally a nice place for surfers looking for manageable waves, especially those who are improving their skills. The vibe here can get a bit crowded, particularly at the corners, but there are plenty of peaks to catch, especially when you put in the effort to paddle out when conditions get bigger.

The optimal swell direction for São Lourenco is Southeast, but you can also catch waves coming from the East and South. The spot can handle swell sizes around 2ft (0.6m), with both left and right wave directions. It’s mostly a beach break, which means the waves come in over sand, making it a bit more forgiving. For the best experience, you’ll want to hit it with a Northwest wind and aim for low to mid tide. It's a decent spot for intermediate surfers looking to refine their skills.

Keep in mind that currents can be strong, particularly with East swells. Make sure to pay attention to the conditions, especially in front of the large condo development nearby. Overall, São Lourenco provides a solid surf experience, but you should be prepared for the challenges that come with crowded peaks.

Surf reports and surf forecasts nearby São Lourenco

São Lourenco
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Beach break
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Praia Branca
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Beach break
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Sao Pedro
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Beach break
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Boracéia
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Beach break
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Pernambuco
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Beach break
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Pitangueiras
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Asturias
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Beach break
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Juréia
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Galhetas
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Point break
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Praia do Tombo
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Readme

Welcome! If you’re new to surf forecasting, check out this quick guide.

Forecast Table

The forecast table (the section on the page with all the numbers) is designed to pack as much information in the screen as possible. Although intimidating at first, it will help you make informed decisions about the waves faster, trust me :D. The table consists of roughly four sections, time and predictions, wind, waves, and tides:

🔮 Time and predictions section

Here we show the forecast thour and the overall surf quality prediction. This is determined based on the wave, wind and tide quality prediction. These individual predictions can be found on the forecast map.

💨 Wind section

The first row on the table (with the 💨 icon) shows wind speed, direction and gust. The more the wind speed the more aggressive the color (from blue, green, orange to red).

🌊 Wave section

The waves section consists of three rows, one for wave height and direction, one for period and one for wave energy. Our algorithm choices the "dominant wave". This is normally the first swell partition, but with heavy local storms it displays the wind waves. If that's the case, we display the numbers in italic and in gray.

🌒 Tide section

The tide section consists of a row with the actual heights per hour (measured at the half hour) and a table that displays the flow of the tide and the extremes (lows and highs).

Forecast map

The forecast map consists of arrows. These arrows represent all wave partitions (swell partitions and wind wave partition) and the wind. This allows you to see things like: a secondary swell or wind waves messes up the surf, or the wind is just a tick offshore so very surfable. Click a metric label in the bottom left to bring that arrow to the front — handy when arrows overlap.

Forecast Cheat Sheet

Short on time? Focus on wave energy. It’s the best single metric to gauge how big and powerful the waves will be.

Click any table cell to jump to that forecast hour. The map will update with forecast arrows, so you can see if wind and swell direction are lining up.

Use the table sidebar to switch units for height and speed.

Log your surf sessions to compare forecasts with real sessions and sharpen future predictions.

Models and Updates

Surfnerd blends multiple global and local wind and swell models using advanced interpolation and spatial techniques to create an "ensemble" forecast. Forecasts are refreshed hourly.

Surf Predictions

Our AI-driven algorithm scores surf quality, shown by green, orange, and gray dots. Each forecast hour is rated for wind, swell, and tide quality, then combined into an overall score. Here’s the scale:

Perfect
Good
Average
Bad or No Data

Session logs also feed the algorithm — the more you log, the smarter your forecasts get.

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Wind certainty

Wind certainty tells you how much the weather models agree on the forecast.

  • High certainty: Models agree closely; forecast is reliable.
  • Medium certainty: Some disagreement; conditions may shift slightly.
  • Low certainty: Models diverge; treat forecast with caution.

We calculate this by comparing wind speed, gust and direction from multiple models (like GFS, ECMWF, Arome, and Harmonie) and seeing how closely they match. They are weighted, meaning that some models count more than others, depending on how good they are for a certain spot.

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