Humboldt Harbor Entrance Surf Forecast

Tide
⏱️s.
⚡️kJ
Tijdzone:
America/Los_Angeles
Wind: SN UNITY Atmos
(20260406 10z)
Golven: SN UNITY WAVE
(20260406 10z)
Morgen ma 06/04 tot di 07/04
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Golfopbouw

Swell 1Swell 2Swell 3Wind waves

Humboldt Harbor Entrance Surf Forecast Eigenschappen

Swell venster
W - NNW
Swell hoogte
6ft - 20ft
Swell breekt over
Zand
Golfrichtingen
Rechts, Links
Wind venster
NNO - N
Werkende getijden
Laag
(Beste met Laag, Beter met opkomend)
Beste getij
Laag
Niveau
Expert
Seizoenen
Herfst, Winter
Boardtypes
Gun, Tow

Humboldt Harbor Entrance Surf Forecast Gids

The Humboldt Harbor Entrance is a prime surf spot located at Humboldt Bay, a crucial area for the local surfing community, largely thanks to Humboldt State University nearby. Arcata, often compared to Santa Cruz, serves as a vibrant hub for surfers in Northern California. The harbor entrance, found between the North and South jetties, can really light up when the conditions are right. This spot is mainly known for its ability to handle big swells, making it a favorite for those looking for challenging surf.

This spot breaks well with swell coming from the west and northwest, handling sizes from about 2 meters (6 feet) up to 6 meters (20 feet). Generally, surfers can expect both left and right waves here, with the rights often barreling into the boat channel, which is quite deep at 13.7 meters (45 feet). The bottom is sandy, which can change the wave shape, but when it’s firing, you can score a solid Pipeline-like left along with steep rights. It’s vital to surf it during low tide, as you'll want to hit it about one hour before to one hour after low tide to avoid getting sucked out to sea. The wave can be quite powerful, so this is really for experienced surfers only.

Access is pretty straightforward; just take Samoa Boulevard (Route 255) until you reach the ocean. Expect a persistent crowd, and the local vibe is pretty heavy, so it's not the best spot for those not familiar with the lineup. Watch out for strong currents and keep your distance from the locals. The peak season here runs from September through February, and really, it’s best suited for surfers riding longer boards like guns or those into tow-in surfing when the swells are massive.

Confidence

Confidence tells you how much the weather models agree on the forecast.

  • High confidence: Models agree closely; forecast is reliable.
  • Medium confidence: Some disagreement; conditions may shift slightly.
  • Low confidence: Models diverge; treat forecast with caution.

We calculate the wind confidence by comparing wind speed, gust and direction from multiple models (like GFS, ECMWF, Arome, and Harmonie) and seeing how closely they match. For wave certainty we compare height, period and direction, also on multiple models. 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 chooses the "dominant wave" using spot-adjusted surf energy (depth + directional fit). This is usually the first swell partition, but during local storms it can switch to wind waves. If that happens, values are shown in gray and italic.

🌒 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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