Rosapenna
Hourly
Confidence
Compare
⏱️s.
⚡️kJ
Sunday 14
Monday 15
Tuesday 16
Wednesday 17
Thursday 18
Timezone:
Europe/Dublin
Wind: ⭐ UNIFIED
(20251214 00z)
Waves: ⭐ UNIFIED
(20251214 00z)
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Rosapenna surf forecast characteristics

Swell window
NW - N
(Best from NW)
Swell size
2ft - 6ft
Swell breaks over
Sand
Wave types
Beach
Wave directions
Left, Right
Wind window
E - E
(Offshore from E)
Works at
Low, Mid, High
Skill Level
Beginner

Rosapenna surf forecast guide

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.

Surf schools and rentals

Surf reports and surf forecasts nearby Rosapenna

Magheroaty
County Donegal, Ireland
Reef break
Sun 14
Mon 15
Tue 16
Wed 17
Thu 18
Magheroaty Beach
County Donegal, Ireland
Beach break
Sun 14
Mon 15
Tue 16
Wed 17
Thu 18
Dunfanaghy
County Donegal, Ireland
Beach break
Sun 14
Mon 15
Tue 16
Wed 17
Thu 18
Rosapenna
County Donegal, Ireland
Beach break
Sun 14
Mon 15
Tue 16
Wed 17
Thu 18
Ballyheirnan Bay
County Donegal, Ireland
Beach break
Sun 14
Mon 15
Tue 16
Wed 17
Thu 18
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 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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