Rosapenna Surf Forecast

Tide
⏱️s.
⚡️kJ
Tijdzone:
Europe/Dublin
Wind: SN UNITY Atmos
(20260317 15z)
Golven: SN UNITY WAVE
(20260317 15z)

Golfopbouw

Swell 1Swell 2Swell 3Wind waves

Rosapenna Surf Forecast Eigenschappen

Swell venster
NW - N
(Beste uit NW)
Swell hoogte
2ft - 6ft
Swell breekt over
Zand
Golftypes
Strand
Golfrichtingen
Links, Rechts
Wind venster
O - O
(Offshore uit O)
Werkende getijden
Laag, Mid, Hoog
Niveau
Beginner

Rosapenna Surf Forecast Gids

Rosapenna is a long, west-facing beach located in Ireland that really needs that NW swell to come alive. This spot is known to offer a fun session, but it can be a bit hit-or-miss depending on the conditions. It’s often referred to as Tra Beg and Tra More, giving you a couple of names to throw around when you’re chatting with other surfers. The beach tends to experience a strong drift running from north to south, which is something to keep in mind when you're out there.

The surf at Rosapenna is mostly beach breaks, making it accessible for surfers of various skills, including beginners. This spot functions best with swells coming from the Northwest and can handle wave sizes starting at about 0.6 meters (around 2 feet). You can catch waves breaking both left and right over the sandy bottom. If you’re planning to hit the waves, the wind from the east is preferable, and it works well at low, mid, or high tide. When the wind is offshore from the east, you might find some decent hollow sections, but it really depends on the swell and tide conditions.

Access to the beach is straightforward, with parking available in the area. Since it’s a long stretch of beach, there’s plenty of room to spread out, and you might find a less crowded spot if you wander a little further down. Just keep an eye on the conditions and adjust your time in the water as needed to make the most out of Rosapenna.

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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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