Prainha - Rio de Janeiro
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Hourly Forecast
Timezone: America/Sao_Paulo
⏱️s.
⚡️kJ
Thursday 28
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Saturday 30
Sunday 31
Monday 01
Tuesday 02
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Prainha - Rio de Janeiro surf guide

Prainha ("Little Beach") is a well-known surf spot located at the southern end of Barra in Rio de Janeiro. It’s tucked into a small cove surrounded by lush hills and tropical jungle, making it a scenic spot for surfers. This beach picks up a lot of swell, and even on days when other spots are flat, you can usually find some decent waves here. Getting to Prainha can take around 45 minutes to an hour from Ipanema, especially during busy weekends, so plan accordingly if you're making the trip.

The surf at Prainha can handle a variety of conditions and sizes, with optimal swell coming from the SouthEast. You can expect waves anywhere from 1 meter (3 ft) to about 2.5 meters (8 ft), and the beach breaks offer both lefts and rights. The wave types are generally beach breaks, and the best tides for surf are low, mid, and high. The paddle out might be a bit challenging on bigger days due to waves breaking on outer sandbars and reforming closer to the beach. Most surfers here are intermediately skilled, and although the crowd can get a bit intense, especially on classic surf days, it’s usually a good vibe overall. Just be sure to watch out for localism on those busier days.

Getting to Prainha is easy and safe, making it a popular spot for both locals and visitors. The environment is mostly clean, and the scenery adds to the overall experience. When planning your surf session, keep in mind that fall and winter are typically the best seasons to catch quality waves here. Just remember to stay chill with the locals, especially when the surf is firing!

Surf reports and surf forecasts nearby Prainha - Rio de Janeiro

Barra de Guaratiba
Unknown Region, Unknown Country
Rivermouth break
Thu 28
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Mon 1
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Grumari
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Beach break
Thu 28
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Mon 1
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Prainha - Rio de Janeiro
Unknown Region, Unknown Country
Beach break
Thu 28
Fri 29
Sat 30
Sun 31
Mon 1
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Mon 8
Praia Macumba
Unknown Region, Unknown Country
Beach break
Thu 28
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Mon 1
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Praia da Macumba
Unknown Region, Unknown Country
Beach break
Thu 28
Fri 29
Sat 30
Sun 31
Mon 1
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Barra da Tijuca
Unknown Region, Unknown Country
Beach break
Thu 28
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Mon 1
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São Conrado
Unknown Region, Unknown Country
Beach break
Thu 28
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Mon 1
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Pepino
Unknown Region, Unknown Country
Beach break
Thu 28
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Mon 1
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Leblon
Unknown Region, Unknown Country
Beach break
Thu 28
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Sat 30
Sun 31
Mon 1
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Praia de Ipanema
Unknown Region, Unknown Country
Beach break
Thu 28
Fri 29
Sat 30
Sun 31
Mon 1
Tue 2
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Sun 7
Mon 8
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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.

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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