Banyans
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Hourly Forecast
Timezone: Pacific/Honolulu
โฑ๏ธs.
โšก๏ธkJ
Tuesday 16
Wednesday 17
Thursday 18
Friday 19
Saturday 20
Sunday 21
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Banyans surf guide

Banyans is one of the most popular surf spots on the Kailua-Kona side of the Big Island. It's right off the main road, making it easy to access, and sits in front of the Kona Bali Kai condos. This location gets a lot of traffic, especially when the waves are chest high or above, attracting both locals and visitors. The environment here is pretty pristine, but expect it to be crowded, especially with the best surfers around. Itโ€™s a place where humility and respect go a long way.

The surf at Banyans can be a bit tricky but rewarding. It breaks year-round, usually clean in the mornings thanks to an easterly wind pattern. The break offers both lefts and rights, with the right tending to offer good turn sections and the possibility of a barrel. It empties into deeper water, while the left can provide a nice open barrel on takeoff but often ends in a closeout over shallower reef. On the summer S to SW swells, you can expect fun waves ranging from 1 to 3 meters (3 to 10 feet). In the winter, the NW to WNW swells deliver solid, manageable surf when other spots are maxed out. The ideal swell direction is SW, and it handles various sizes from 1 to 3 meters. Tides can be low, mid, or high, and paddling varies from fairly short on smaller days to more challenging when the surf picks up.

If you're planning to surf here, be mindful of the local vibe; it's competitive but can also be fun once you know the lay of the land. The spot caters mainly to expert surfers, so be prepared to show your skills. The bottom is uneven reef, so watch for urchins and keep a keen eye on your surroundings. Surfboards of all types are welcome, including shortboards, funboards, longboards, and even bodyboards, but do keep in mind that showing respect to locals and other surfers is key to enjoying your time at Banyans.

Surf reports and surf forecasts nearby Banyans

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Readme

Welcome! If youโ€™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:

๐Ÿ”ฎ 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.

๐Ÿ’จ Wind section

The first row on the table (with the ๐Ÿ’จ icon) shows wind speed, direction and gust. The more the wind speed the more aggressive the color (from blue, green, orange to red).

๐ŸŒŠ 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.

๐ŸŒ’ 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 โ€” handy when arrows overlap.

Forecast Cheat Sheet

Short on time? Focus on wave energy. Itโ€™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. Hereโ€™s the scale:

Perfect
Good
Average
Bad or No Data

Session logs also feed the algorithm โ€” 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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