Rossnowlagh
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Hourly Forecast
Timezone: Europe/Dublin
⏱️s.
⚡️kJ
Saturday 13
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Tuesday 16
Wednesday 17
Thursday 18
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Rossnowlagh surf guide

Rossnowlagh is nestled deep into Donegal Bay and is known for its long, flat sandy beach stretching over 3km. It’s a popular spot, especially for families and beginners looking for a friendly wave. The vibe here is pretty laid-back, making it a great spot for a day out at the beach. Parking is available in the town lot, but while you can park on the beach, it’s usually not recommended due to high tide concerns.

The surf at Rossnowlagh is generally smaller and less powerful than surrounding breaks, which makes it a go-to for those just starting out or for anyone wanting a relaxed session. The waves typically range from knee to head high (about 0.5 to 2.1 meters), with more clean, rolling peaks forming at mid to high tide. You can expect to catch some fun lefts and rights, especially in the rip at the south end near the cliffs. The best conditions hit with southwesterly to northwesterly swells (optimal is west), and it can handle swell sizes from about 4ft to 7ft (1.2 to 2.1 meters). The beach breaks over sand, offering plenty of options for shortboarders, longboarders, funboarders, or even fish surfers. If you’re up for it, get out here in any season—summer, autumn, winter, or spring—and you’ll likely find something fun to ride.

The crowd factor can be pretty busy on sunny weekends, but it's mostly well spread out, so it doesn’t feel too cramped. There’s a friendly, happy-go-lucky vibe here, making it perfect for kids and families. Just keep an eye out for weeverfish while you’re enjoying your surf session, and watch for the rip currents at the south end of the beach.

Surf reports and surf forecasts nearby Rossnowlagh

Mullaghmore Head
County Sligo, Ireland
Reef break
Sat 13
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Mon 15
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Tullaghan Left
County Leitrim, Ireland
Point break
Sat 13
Sun 14
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Mon 22
Tue 23
Wed 24
Tullaghan Right
County Leitrim, Ireland
Reef break
Sat 13
Sun 14
Mon 15
Tue 16
Wed 17
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Fri 19
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Tue 23
Wed 24
Black Spot
County Leitrim, Ireland
Reef break
Sat 13
Sun 14
Mon 15
Tue 16
Wed 17
Thu 18
Fri 19
Sat 20
Sun 21
Mon 22
Tue 23
Wed 24
Pampa
County Leitrim, Ireland
Reef break
Sat 13
Sun 14
Mon 15
Tue 16
Wed 17
Thu 18
Fri 19
Sat 20
Sun 21
Mon 22
Tue 23
Wed 24
Bundoran - The Peak
County Donegal, Ireland
Reef break
Sat 13
Sun 14
Mon 15
Tue 16
Wed 17
Thu 18
Fri 19
Sat 20
Sun 21
Mon 22
Tue 23
Wed 24
Tullan Strand
County Donegal, Ireland
Beach break
Sat 13
Sun 14
Mon 15
Tue 16
Wed 17
Thu 18
Fri 19
Sat 20
Sun 21
Mon 22
Tue 23
Wed 24
Bundoran - 3D's
County Donegal, Ireland
Reef break
Sat 13
Sun 14
Mon 15
Tue 16
Wed 17
Thu 18
Fri 19
Sat 20
Sun 21
Mon 22
Tue 23
Wed 24
Bundoran - Tullan Strand
County Donegal, Ireland
Beach break
Sat 13
Sun 14
Mon 15
Tue 16
Wed 17
Thu 18
Fri 19
Sat 20
Sun 21
Mon 22
Tue 23
Wed 24
Rossnowlagh
County Donegal, Ireland
Beach break
Sat 13
Sun 14
Mon 15
Tue 16
Wed 17
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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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