Surf Forecasts:
Keaulanas surf forecast from 16 Aug 2026:
- Best quality surf: Monday 17 Aug, 2AM (local time) - 2.5ft (0.8m), 14s period, S swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 8AM (local time) - 2.5ft (0.8m), 17s period, SSW swell with 364 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 2AM (local time) - 2.5ft (0.8m), 14s period with S swell.
Best Forecast Surf Conditions for Keaulanas this week:
The surf forecast for Keaulanas over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 2AM. The primary swell is predicted to be 0.8m and 14s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Keaulanas in the next 16 days are 0.8m 17s and forecast to arrive on Friday (Aug 21) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 7s period and expected on Saturday (Aug 15) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 17th Aug) | 2.5ft (0.8m) 14s |
| Best Surf | 2AM (Mon 17th Aug) | 2.5ft (0.8m) 14s |
| Most Powerful | 8AM (Fri 21st Aug) | 2.5ft (0.8m) 17s |
Table - best surf conditions forecast for Keaulanas over the next 16 days.
The Lowdown
Alright crew, Rusty here. Let's break down this forecast window.
First, I gotta say, the start of this run is a bit of a letdown. We're looking at a few days of pretty weak, small surf, and the wind just isn't doing us any favors. It's not a total washout, but you'll be working hard for anything marginal. This slow period sticks around for a few days.
Things start to look a little more promising as we head into next week. The surf stays small, but the wind is forecast to drop right out. We're talking glassy conditions by Thursday the 20th and into the weekend. That's the kind of clean, calm surface that makes even a smaller wave fun. The energy is still weak, but with that kind of surface, it'll be worth a paddle. The standout in this stretch is shaping up to be Saturday the 22nd. It's not big, just around 3ft, but it's from the SSW and the wind is forecast to be totally calm and glassy. That's about as clean as it gets and will be the pick of the first week.
There's a bit of a dip again early next week where the trade winds pick back up and make things messy. That Tuesday the 25th morning might be okay with a bit of an offshore puff, but it gets blown out again quickly.
Now, the one that has me looking further down the calendar. The last weekend of the run, particularly Sunday the 30th of August, is the one to circle. The models are hinting at a pulse of SSW energy that pushes the surf up to around 4ft, and, more importantly, the energy reading jumps way up. That’s a solid step up from the rest of the run. More than that, the wind is forecast to be light and glassy again. This looks like the best combination of size and clean conditions we’ve seen all forecast. For surfers who can handle a bit more push, this is the window. Just remember this is over a week and a half out, so it’s a promising idea rather than a guarantee.
So, to keep it simple: the first week is about small, clean waves on the glassy days, with Saturday the 22nd being the best of a modest bunch. The real one to watch is that Sunday the 30th, when we might finally get a bit of size and perfect conditions together. If you can only pick one day, that’s the one.
Stay salty.
Rusty
Short Range ForecastHeavy rain (total 32mm), heaviest during Sat night. Warm (max 27°C on Sat afternoon, min 23°C on Sat night). Winds decreasing (near gales from the ENE on Sat night, light winds from the E by Sun night). | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Thu afternoon, min 24°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | ||||||||||||||
PM | 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) | S 13 | S 13 | S 17 | S 13 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | SW 16 | SSW 16 | SSW 16 | SW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 |
Wave Graph  | ||||||||||||||||||||
 kJ | 171 | 173 | 145 | 121 | 239 | 338 | 329 | 225 | 165 | 166 | 158 | 129 | 100 | 175 | 249 | 200 | 278 | 291 | 261 | 322 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | cross-off | cross-off | glassy | glassy | glassy |
High Tide | 5:29PM0.55m | 6:36AM0.49m | 5:51PM0.47m | 7:32AM0.51m | 6:05PM0.40m | 8:37AM0.52m | 5:51PM0.34m | 9:54AM0.53m | 11:13AM0.55m | 12:17PM0.58m | 11:07PM0.20m | |||||||||
Low Tide | 00:07AM0.09m | 12:16PM0.25m | 00:30AM0.09m | 1:28PM0.30m | 00:54AM0.10m | 3:34PM0.33m | 1:22AM0.12m | 2:02AM0.13m | 3:07AM0.14m | 9:33PM0.20m | ||||||||||
 |  |  | | | | |  |  | | | | | | | | | | | | |
 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — |
mm | — | 11 | 15 | 5 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 25 | 27 | 26 | 27 | 27 | 25 | 26 | 27 | 25 | 26 | 27 | 26 | 27 | 28 | 26 | 27 | 27 | 26 |
Feels °C | 23 | 21 | 22 | 28 | 28 | 29 | 28 | 25 | 26 | 27 | 25 | 28 | 29 | 28 | 30 | 31 | 28 | 31 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 13 | SSE 10 | SSE 8 | S 7 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | NE 7 | NNE 6 | NNE 6 | SW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 |
| kJ | 171 | 173 | 749 | 376 | 100 | 338 | 329 | 225 | 165 | 166 | 158 | 36 | 26 | 26 | 249 | 200 | 278 | 291 | 261 | 322 |
Swell 2 Height (m) Direction Period (s) | W 13 | S 18 | S 13 | NE 8 | NE 8 | S 6 | NE 6 | NE 6 | SSW 17 | SSW 18 | SW 18 | SW 16 | S 12 | SSW 16 | NE 6 | NNE 6 | NNE 6 | NE 6 | NE 7 | NE 7 |
| kJ | 30 | 99 | 81 | 167 | 94 | 50 | 49 | 39 | 115 | 123 | 79 | 129 | 69 | 175 | 33 | 27 | 28 | 19 | 21 | 23 |
Swell 3 Height (m) Direction Period (s) | NNW 8 | WNW 13 | S 17 | S 13 | S 14 | WNW 11 | S 6 | SSW 5 | ENE 7 | WNW 13 | WNW 12 | S 12 | SSW 16 | SSW 12 | S 11 | SSE 11 | S 11 | S 11 | SSE 8 | SW 10 |
| kJ | 12 | 33 | 145 | 121 | 239 | 25 | 33 | 9 | 10 | 34 | 28 | 44 | 100 | 48 | 39 | 41 | 22 | 21 | 14 | 25 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 6 | ENE 8 | E 9 | — | NE 7 | — | E 7 | NE 5 | NE 6 | NE 5 | — | — | — | — | — | — | — | — | — |
| kJ | 531 | 571 | 412 | 393 | — | 69 | — | 106 | 18 | 20 | 22 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 167 | 176 | 92 | 24 | 0 | 2 | 2 | 0 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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Information about the Keaulanas Surf forecast
The above surf forecast table for Keaulanas provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Keaulanas can be found by selecting the local surf guide option on the grey menu. Our Keaulanas 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 (Keaulanas) 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 Keaulanas 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.
Keaulanas is 7 km (4 miles) from Makakilo City. If you plan a vacation in Oahu, look for hotels and other accommodation in Makakilo City. Makakilo City has rooms for a wide range of budgets as well as car hire and transport links.
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