Witches Rock (Roca Bruja) Surf Forecast

Tide
⏱️s.
⚡️kJ
Tijdzone:
America/Costa_Rica
Wind: SN UNITY Atmos
(20260418 21z)
Golven: SN UNITY WAVE
(20260418 21z)
Morgen za 18/04 tot zo 19/04
Geen surfvensters (2 dagen)
Ontgrendel 3 extra dagen in de tijdlijn
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Golfopbouw

Swell 1Swell 2Swell 3Wind waves

Witches Rock (Roca Bruja) Surf Forecast Eigenschappen

Swell venster
Z - W
(Beste uit ZW)
Swell hoogte
4ft - 12ft
Swell breekt over
Zand
Golftypes
Strand
Golfrichtingen
Links, Rechts
Wind venster
NO - NO
(Offshore uit NO)
Werkende getijden
Mid, Hoog
Niveau
Beginner

Witches Rock (Roca Bruja) Surf Forecast Gids

Witches Rock, also known as Roca Bruja, is a surf spot located near Playa Naranjo. This place is famous for its striking rock formation that juts out into the ocean, creating a unique backdrop. The beach itself stretches about 6 km and is part of a stunning natural environment. The area is mostly accessible by boat from Playa del Coco or via a rough 4X4 track during the dry season, making it a bit of an adventure to get there. Just keep in mind that there’s no accommodation nearby, so if you plan to stay overnight, you'll need to camp.

When it comes to surfing, Witches Rock serves up some pretty decent waves. The optimal swell direction is from the Southwest, with South and West swells also working well. You can expect to handle swell sizes around 4 ft (about 1.2 meters), which makes it suitable for beginners looking to improve their skills. The waves break over sand and can come in both left and right directions. The best time to catch waves here is during mid to high tides, especially with a favorable NorthEast wind. Most surfers tend to gather just south of the rivermouth, where the sandbars create good peaks, but there are always more waves if you head further south.

Over the past few years, Witches Rock has seen a significant increase in crowds, so be prepared to share the waves. Also, keep in mind that there are some saltwater crocodiles around the rivermouths, so stay aware of your surroundings while enjoying the surf. Overall, it’s a fun spot with a mix of waves that can cater to different skill levels, but it can get busy, so you might want to plan your visit accordingly.

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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 chooses the "dominant wave" using spot-adjusted surf energy (depth + directional fit). This is usually the first swell partition, but during local storms it can switch to wind waves. If that happens, values are shown in gray and italic.

🌒 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.

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

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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