The LineUp at Wai Kai
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Hourly Forecast
Timezone: Pacific/Honolulu
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⚡️kJ
Saturday 13
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Monday 15
Tuesday 16
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Thursday 18
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The LineUp at Wai Kai surf guide

The LineUp at Wai Kai is a surf park located in the Wai Kai community of Ewa Beach, about 22 miles from Honolulu. It features the Wai Kai Wave, a 100-foot-wide standing surf wave that offers a variety of water-based activities on a 52-acre lagoon. This spot attracts both locals and visitors, making it a social hub for surfers in the area. The LineUp also hosts surf competitions and provides a relaxed vibe where surfers can enjoy their time before or after hitting the waves.

The surf at The LineUp consists of a deep-water standing wave offering adjustable, glassy waves that range from two feet up to head-high, suitable for all skill levels. Surfers can ride both left and right directions, making it fun for everyone from beginners to experts. There's no paddling involved here, so you can get right into the action. The wave is also good for progression, allowing surfers to practice carving turns and top-to-bottom surfing on boards like shortboards, fish, funboards, and even bodyboards. This spot is usable year-round, so whether it’s spring, summer, autumn, or winter, there are waves to enjoy.

Accessing The LineUp is easy with a big parking lot available, and you can expect lighter crowds on weekdays, while afternoons and weekends can get busier. The atmosphere is friendly, with a good mix of skill levels among surfers, and the surf ops team is helpful in accommodating everyone to the wave. Just keep in mind the potential hazards like getting held down after bailing, so wearing a helmet is a good idea. It’s best to use the boards provided at The LineUp instead of bringing your own, as they shoot back at you quickly when you fall.

Surf reports and surf forecasts nearby The LineUp at Wai Kai

Kewalo's
Hawaii, United States
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
Sand Island
Hawaii, United States
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
Ewa Beach Park
Hawaii, United States
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
Ewa Beach
Hawaii, United States
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
Coves
Hawaii, United States
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
The LineUp at Wai Kai
Hawaii, United States
Unknown 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
White Plains Beach
Hawaii, United States
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
Tracks
Hawaii, United States
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
Maili Point
Hawaii, United States
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
Barbers Point
Hawaii, United States
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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