San Blas
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Hourly Forecast
Timezone: America/Mazatlan
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⚡️kJ
Saturday 13
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San Blas surf guide

San Blas is located about 80 miles north of Vallarta, where the coastline shifts to catch some nice swell during the spring and summer months. This area is known for its various surf spots, with Stoner's Point being a well-known gem just south of the town. It's a mellow, cobblestone righthand pointbreak that many surfers enjoy. Besides Stoner's Point, there’s also Santa Cruz on the opposite side of the bay, which offers a lefthand point. In general, if you’re around San Blas, you’ll find yourself surrounded by a lot of beachbreak options.

The surf here can range from waist high to double overhead (about 1 to 2.5 meters). San Blas is great for catching waves from different swell directions including South, SouthWest, and WestSouthWest, and it handles swell sizes typically between 3ft to 8ft (approximately 1 to 2.5 meters). The waves break over sand, providing both lefts and rights. You can surf at all tides, but low to mid and mid to high tides work best for various spots. With manageable paddling, it caters to all skill levels from beginner to expert, making it accessible for most surfers. The preferred wind directions here are North, NorthNorthEast, and East, which can really make your session enjoyable.

Access to the beach breaks is pretty easy, and while the crowd can get a bit busy at the main spots, the overall vibe is laid-back and friendly. You can expect a clean environment most of the time, but after heavy rains, it may not be as fresh. Generally, the surf season runs from March to October, so plan your trip accordingly. Most surfers bring shortboards, fishes, funboards, or longboards, depending on their style and the conditions.

Surf reports and surf forecasts nearby San Blas

Aticama
Nayarit, Mexico
Point break
Sat 13
Sun 14
Mon 15
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Wed 17
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Sat 20
Sun 21
Mon 22
Tue 23
Wed 24
Los Corchos
Nayarit, Mexico
Beach break
Sat 13
Sun 14
Mon 15
Tue 16
Wed 17
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Fri 19
Sat 20
Sun 21
Mon 22
Tue 23
Wed 24
Las Islitas
Nayarit, Mexico
Point break
Sat 13
Sun 14
Mon 15
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Wed 17
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Fri 19
Sat 20
Sun 21
Mon 22
Tue 23
Wed 24
Stoner's Point
Nayarit, Mexico
Point break
Sat 13
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Sun 21
Mon 22
Tue 23
Wed 24
San Blas
Nayarit, Mexico
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
Santa Cruz - Nayarit
Nayarit, Mexico
Point break
Sat 13
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Fri 19
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Sun 21
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Tue 23
Wed 24
Lolas
Nayarit, Mexico
Point break
Sat 13
Sun 14
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Sun 21
Mon 22
Tue 23
Wed 24
San Pancho
Nayarit, Mexico
Point break
Sat 13
Sun 14
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Fri 19
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Sun 21
Mon 22
Tue 23
Wed 24
Ostiones
Nayarit, Mexico
Reef break
Sat 13
Sun 14
Mon 15
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Wed 17
Thu 18
Fri 19
Sat 20
Sun 21
Mon 22
Tue 23
Wed 24
Punta Sayulita
Nayarit, Mexico
Reef break
Sat 13
Sun 14
Mon 15
Tue 16
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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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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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