Surf Forecasts:
Kewalos surf forecast from 20 Aug 2026:
- Best quality surf: Thursday 20 Aug, 2AM (local time) - 4ft (1.2m), 7s period, ENE swell with cross-offshore winds.
- Most powerful swell: Wednesday 26 Aug, 8PM (local time) - 2.5ft (0.8m), 19s period, S swell with 450 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 2AM (local time) - 4ft (1.2m), 7s period with ENE swell.
Best Forecast Surf Conditions for Kewalos this week:
The surf forecast for Kewalos over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 2AM. The primary swell is predicted to be 1.2m and 7s period with a secondary swell of 0.5m and 16s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Kewalos in the next 16 days are 0.8m 19s and forecast to arrive on Wednesday (Aug 26) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 6s period and expected on Thursday (Aug 20) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Thu 20th Aug) | 4ft (1.2m) 7s |
| Best Surf | 2AM (Thu 20th Aug) | 4ft (1.2m) 7s |
| Most Powerful | 8PM (Wed 26th Aug) | 2.5ft (0.8m) 19s |
Table - best surf conditions forecast for Kewalos over the next 16 days.
The Lowdown
Alright folks, let’s talk about the next 16 days. The only wave on the map is Kewalos, a serious reef break for advanced surfers only, and it likes the swell coming from the SSE.
Starting off on Thursday, August 20th and Friday, August 21st, we’re looking at tiny surf, just 2 ft. The wind plays nice though – Thursday morning has a light cross-shore, and Friday afternoon goes dead glassy, which is a dream for clean face. Swell is coming from the SSW/SW, not the ideal direction, but the water temp is normal for this time of year. Energy is low, in the 261 to 312 range, so it’s weak. Friday afternoon is the only time worth paddling out in this first bit.
Then things go sour. From Saturday, August 22nd all the way to Sunday, August 30th, the trade winds roar at 15 to 25 mph from the ENE. The wave height climbs to 6 ft, and the energy gets strong (384 to 982), but it’s all short-period windswell. That’s blown-out, choppy junk. A long dry spell with nothing good to say – looks more like a kitesurfer’s playground.
Here’s the payoff: Monday, August 31st brings a big jump. Swell hits 8 ft to 8 ft from the ENE, with a very strong energy reading of 1986 to 2053. This is expert-only territory, no joke. The period stretches to 13 seconds – real groundswell – but the direction is cross-off for a reef that wants SSE, so it’s a little wonky.
The best window is Tuesday, September 1st and Wednesday, September 2nd. Still overhead at 7 ft from the ENE, strong energy (around 1597 to 1610), and the period settles to 10-12 seconds. The wind eases to a moderate 12 mph breeze. This is the cream of the crop – solid, powerful, and cleaner than anything else in the forecast. For the experts, that’s the call. By Thursday, September 3rd, it’s fading back to 5 ft and the energy drops quick.
So your one shot is that August 31st to September 2nd stretch. Big, powerful, expert swell with the cleanest wind we’ll see. The first two weeks are a wipeout from the trades. Crowds at Kewalos are often there, but with this size, only the grizzled locals will be out.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu morning, min 25°C on Wed night). Winds increasing (calm on Thu afternoon, fresh winds from the ENE by Sat afternoon). | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Mon afternoon. Warm (max 27°C on Mon afternoon, min 25°C on Sat night). Winds decreasing (strong winds from the ENE on Sun afternoon, moderate winds from the ENE by Mon night). | ||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | ENE 7 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SW 16 | SW 16 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 153 | 207 | 200 | 274 | 291 | 264 | 322 | 261 | 255 | 255 | 316 | 268 | 342 | 280 | 227 | 317 | 329 | 319 | 218 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross-off | cross-on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 11:25AM0.56m | 10:11PM0.21m | 12:25PM0.59m | 00:08AM0.21m | 1:12PM0.63m | 1:06AM0.23m | 1:52PM0.66m | 1:46AM0.26m | 2:26PM0.67m | 2:21AM0.29m | 2:56PM0.68m | 2:55AM0.33m | |||||||
Low Tide | 2:47AM0.12m | 8:27PM0.20m | 8:41PM0.17m | 5:06AM0.12m | 9:00PM0.16m | 6:08AM0.10m | 9:18PM0.14m | 6:59AM0.08m | 9:35PM0.13m | 7:43AM0.06m | 9:53PM0.11m | ||||||||
 |  | | | | | | | | | | | |  |  |  | |  | | |
 | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 6:58 | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 | — | 3 |
Temp °C | 25 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 25 | 26 | 26 | 25 | 26 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 25 | 30 | 31 | 30 | 31 | 30 | 29 | 25 | 24 | 23 | 23 | 23 | 22 | 24 | 26 | 26 | 27 | 25 | 27 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | E 8 | ENE 7 | ENE 7 | SW 17 | ENE 7 | ENE 7 | SW 16 | SW 16 | SSW 16 | SW 15 | SSW 15 | SW 14 | SSW 14 | E 8 | SSW 13 | SSW 12 | SSW 16 | SSW 15 |
| kJ | 153 | 54 | 131 | 108 | 291 | 48 | 85 | 261 | 255 | 212 | 115 | 191 | 100 | 166 | 51 | 93 | 86 | 142 | 121 |
Swell 2 Height (m) Direction Period (s) | SW 16 | NE 6 | SSW 17 | SW 16 | NNE 7 | SW 16 | SSW 16 | E 8 | W 11 | S 14 | S 13 | SSE 13 | SSE 13 | SSE 12 | SSW 13 | SSE 11 | SSW 16 | SSW 12 | SSE 10 |
| kJ | 129 | 43 | 200 | 274 | 31 | 264 | 322 | 43 | 62 | 104 | 90 | 34 | 96 | 50 | 156 | 43 | 146 | 56 | 52 |
Swell 3 Height (m) Direction Period (s) | S 12 | SSW 18 | W 11 | W 9 | W 11 | NNE 7 | WNW 10 | W 10 | S 12 | WNW 10 | SSW 15 | S 11 | SSW 15 | SSW 18 | SSE 12 | SSW 17 | SSE 7 | SSE 7 | SSW 12 |
| kJ | 45 | 207 | 37 | 27 | 57 | 26 | 32 | 51 | 47 | 33 | 76 | 22 | 71 | 62 | 48 | 94 | 18 | 9 | 55 |
Wind waves Height (m) Direction Period (s) | NNE 6 | — | — | — | — | — | — | ENE 6 | ENE 6 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 |
| kJ | 51 | — | — | — | — | — | — | 80 | 207 | 255 | 316 | 268 | 342 | 280 | 227 | 317 | 329 | 319 | 218 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 28 | 38 | 38 | 42 | 130 | 38 | 36 | 36 | 28 | 2 | 28 | 1 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the Kewalos Surf forecast
The above surf forecast table for Kewalos provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kewalos can be found by selecting the local surf guide option on the grey menu. Our Kewalos surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Kewalos) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Kewalos may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Kewalos is 5 km (3 miles) from Honolulu. If you plan a vacation in Oahu, look for hotels and other accommodation in Honolulu. Honolulu has rooms for a wide range of budgets as well as car hire and transport links.
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