Sennen
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Hourly Forecast
Timezone: Europe/London
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Sennen surf guide

Sennen is a stunning beach located just north of Land’s End and is known as the most westerly beach in Britain. This crescent-shaped stretch of golden sand is a popular spot among surfers, especially during the peak summer months when the conditions can be fun and inviting. The beach is backed by a car park and has plenty of facilities nearby, making it easy to spend a day here.

The surf at Sennen usually breaks over sand and can handle swell sizes from about 2ft (0.6m) to 6ft (1.8m). The optimal swell direction is from the SouthWest, but it can also pick up waves coming from the South and NorthWest. When the conditions are right, surfers can find both left and right waves, with low to mid tides being preferable. It’s a decent spot for surfers of all abilities—beginners can find their feet here, while intermediates and experts can enjoy the fun waves too. The southern end of the beach tends to be more sheltered when the swell gets bigger. Just keep in mind that rip currents can be a hazard when the conditions are strong.

Access is straightforward; there's a car park right by the surf shop at the bottom of the hill. During summer, expect a crazy crowd, but things are more manageable in autumn and winter. The local vibe is generally tolerant, welcoming surfers who show humility and respect. The prime time to hit the waves is from September to November when the banks are typically more groomed, offering a chance for some classic sessions on long walls.

Surf reports and surf forecasts nearby Sennen

Sennen
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Beach break
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Gwenvor
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Beach break
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Gwenver
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Beach break
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Porthcurno
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Beach break
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Porthmeor
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Beach break
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Carbis Bay
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Beach break
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Hayle Rivermouth
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Rivermouth break
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Gwithian
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Beach break
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Perranuthanoe
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Beach break
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Praa Sands
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Beach break
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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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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.

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