Guana Bay
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Hourly Forecast
Timezone: America/Lower_Princes
⏱️s.
⚡️kJ
Saturday 13
Sunday 14
Monday 15
Tuesday 16
Wednesday 17
Thursday 18
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Guana Bay surf guide

Guana Bay is a casual beachbreak located on the eastern coast, known for its laid-back vibe. It's usually not too crowded, making it a chill spot for surfers looking to catch some waves without the hustle and bustle of more popular locales. The beach features sugary sands that create a nice environment for a day out in the sun, even when the surf isn't firing.

When it comes to surfing, Guana Bay mostly offers mediocre waves. It can handle swell sizes around 2ft (0.6m) and generally works best with an east swell. You’ll find waves breaking over sand and they tend to roll in from various directions, both left and right. The best conditions happen when the wind is coming from the west. It's great for beginners since it usually has some kind of breaking wave, making it a safe option for those just starting out. Tides don’t have a big effect, as it can work during low, mid, and high tides.

While it may not be the premier surf spot, Guana Bay is a solid choice for beginners wanting to practice. Plus, the waves here can be a good warm-up before heading to more challenging breaks elsewhere. Just be ready to find better surf if you’re looking for something more exciting!

Surf reports and surf forecasts nearby Guana Bay

Friar's Bay
Collectivite De Saint Martin, Saint Martin
Beach break
Sat 13
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Mon 15
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Fri 19
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Wilderness
Collectivite De Saint Martin, Saint Martin
Point break
Sat 13
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Sun 21
Mon 22
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Cupecoy
Sint Maarten, Sint Maarten
Reef break
Sat 13
Sun 14
Mon 15
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Thu 18
Fri 19
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Sun 21
Mon 22
Tue 23
Wed 24
Mullet Bay
Sint Maarten, Sint Maarten
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
Le Galion
Collectivity Of Saint Martin, Saint Martin
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
The Bowl
Collectivity Of Saint Martin, Saint Martin
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
Guana Bay
Sint Maarten, Sint Maarten
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
Anse des Lézards
Unknown Region, Unknown Country
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
Anse des Cayes
Unknown Region, Unknown Country
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
St Jean
Unknown Region, Unknown Country
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
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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"Great Forecasts. Nothing more, nothing less."

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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