Ferrugem
Hourly
Confidence
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Friday 31
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Tap a forecast cell to explore conditions on the map.
Timezone: America/Sao_Paulo
Wind: GFS (20251031 00z)
Waves: GFS WAVE (20251031 00z)

Ferrugem surf guide

Ferrugem is a beach located in a picturesque setting that is popular among surfers. Known for its consistent beachbreaks, it's a reliable spot for catching waves. The beach has a mixture of mellow and more challenging conditions, making it suitable for surfers of different skill levels. The name "Praia da Ferrugem" translates to "Rust Beach," which comes from the brownish/yellowish river runoff that flows into the sea.

The surf at Ferrugem can handle swells ranging from about 2 feet (0.6 meters) to 6 feet (1.8 meters). It primarily breaks over sand, with left and right waves depending on the swell direction, with the best conditions often found at the northeast end of the beach. When it's flat, this spot can still offer some fun waves, especially in summer. The tidal conditions are best at low to medium heights, and for optimal surfing, calm or offshore winds from the northwest are preferred. On good days, it can produce long lefts or short rights, making it a decent choice when other spots might be underwhelming.

Access to the beach is pretty easy, which is great for surfers looking to catch a session without too much hassle. While it can get crowded at times, it's usually not overwhelming, so you can find your space, depending on when you show up. The local vibe can vary from friendly to a bit more aggro, especially when the swell is pumping. Overall, itโ€™s a spot that deserves a check when you're in the area, especially during the fall and winter months when conditions are typically at their best.

Surf reports and surf forecasts nearby Ferrugem

Campeche
Unknown Region, Unknown Country
Beach break
Fri 31
Sat 1
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Morro das Pedras
Unknown Region, Unknown Country
Reef break
Fri 31
Sat 1
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Matadeiro
Unknown Region, Unknown Country
Rivermouth break
Fri 31
Sat 1
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Lagoinha do Leste
Unknown Region, Unknown Country
Beach break
Fri 31
Sat 1
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Mon 3
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Tue 11
Naufragados
Unknown Region, Unknown Country
Beach break
Fri 31
Sat 1
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Guarda do Embaรบ
Unknown Region, Unknown Country
Point break, Beach break
Fri 31
Sat 1
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Silveira Garopaba
Unknown Region, Unknown Country
Point break
Fri 31
Sat 1
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Ferrugem
Unknown Region, Unknown Country
Beach break
Fri 31
Sat 1
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Praia da Vila Imbituba
Unknown Region, Unknown Country
Beach break
Fri 31
Sat 1
Sun 2
Mon 3
Tue 4
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Fri 7
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Ravena
Unknown Region, Unknown Country
Beach break, Offshore break
Fri 31
Sat 1
Sun 2
Mon 3
Tue 4
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Fri 7
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Confidence

Confidence tells you how much the weather models agree on the forecast.

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

We calculate the wind confidence by comparing wind speed, gust and direction from multiple models (like GFS, ECMWF, Arome, and Harmonie) and seeing how closely they match. For wave certainty we compare height, period and direction, also on multiple models. 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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Readme

Welcome! If youโ€™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:

๐Ÿ”ฎ 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.

๐Ÿ’จ Wind section

The first row on the table (with the ๐Ÿ’จ icon) shows wind speed, direction and gust. The more the wind speed the more aggressive the color (from blue, green, orange to red).

๐ŸŒŠ 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.

๐ŸŒ’ 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 โ€” handy when arrows overlap.

Forecast Cheat Sheet

Short on time? Focus on wave energy. Itโ€™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. Hereโ€™s the scale:

Perfect
Good
Average
Bad or No Data

Session logs also feed the algorithm โ€” the more you log, the smarter your forecasts get.

With Surfnerd, no more "you should have been here yesterday"

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