Surf Forecasts:
Keaulanas surf forecast from 21 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 5PM (local time) - 2.5ft (0.8m), 18s period, S swell with offshore winds.
- Most powerful swell: Thursday 27 Aug, 11AM (local time) - 3.5ft (1.0m), 17s period, S swell with 579 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 8PM (local time) - 2ft (0.6m), 17s period with SSW 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 Thursday (Aug 20) at 8PM. The primary swell is predicted to be 0.6m and 17s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Keaulanas in the next 16 days are 1.0m 17s and forecast to arrive on Thursday (Aug 27) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 6s period and expected on Sunday (Aug 23) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Best Surf | 5PM (Wed 26th Aug) | 2.5ft (0.8m) 18s |
| Most Powerful | 11AM (Thu 27th Aug) | 3.5ft (1.0m) 17s |
Table - best surf conditions forecast for Keaulanas over the next 16 days.
The Lowdown
Hey folks, Rusty here. Let's talk about what's coming up for Keaulanas over the next couple of weeks.
It's a real mixed bag to start. We've got some small, clean surf on the way, but the first few days are looking pretty marginal with those moderate breezes. The standout window for the first week is shaping up for the afternoon of Wednesday, August 26th. We'll see a groundswell from the S, around 3ft, with a very long 18-second period – that's real energy from deep water. The combined swell energy is sitting at 571 (moderate), and with a moderate offshore wind from the ENE, it should be well-shaped and clean. This is the best bet for a proper session in the first week.
The water temperature is a pleasant 81°F, which is about average for this time of year.
For the second week, things get a lot more promising. Wednesday, September 2nd, is the pick of the whole outlook. The morning session has a clean 3ft swell from the SSW, with a long 18-second period, and the combined energy jumps to 413 (moderate). The wind? Glassy, absolutely flat calm. That means perfect, silky conditions. With the swell arriving from the SSW and the spot's optimum being from the W, it should wrap in nicely. After a week of trade winds, that glassy morning is a huge score.
The following week remains small and clean through to Friday, September 4th, with a few 2ft and 2ft swells from the S, but the energy drops off. It'll be rideable for the longboard or a foiling session, but nothing to get the heart pumping. The winds stay offshore, so it won't be messy, just underwhelming.
Overall, don't sleep on that Wednesday afternoon, August 26th, but the absolute gem is the glassy Wednesday morning on September 2nd. Mark it.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Thu afternoon, min 25°C on Thu night). Winds increasing (calm on Fri afternoon, fresh winds from the ENE by Sun morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Sun afternoon, min 25°C on Sun night). Mainly fresh winds. | |||||||||||||||||||
Thu 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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) | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SSW 16 | SW 16 | SW 16 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 16 | SSW 16 | SSW 15 | SSW 14 | S 18 | S 19 |
Wave Graph  | ||||||||||||||||||||
 kJ | 200 | 278 | 291 | 261 | 322 | 326 | 255 | 245 | 201 | 191 | 186 | 166 | 156 | 140 | 147 | 196 | 121 | 215 | 399 | 343 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross | glassy | cross-off | cross-off | cross-off | off | off | cross-off | off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | off | off |
High Tide | 12:17PM0.58m | 11:07PM0.20m | 1:05PM0.61m | 00:41AM0.22m | 1:43PM0.64m | 1:27AM0.24m | 2:17PM0.67m | 2:05AM0.28m | 2:47PM0.68m | 2:41AM0.32m | 3:14PM0.68m | 3:17AM0.36m | ||||||||
Low Tide | 3:07AM0.14m | 9:33PM0.20m | 9:13PM0.18m | 5:44AM0.11m | 9:21PM0.17m | 6:39AM0.09m | 9:34PM0.15m | 7:24AM0.08m | 9:50PM0.14m | 8:06AM0.07m | 10:06PM0.13m | |||||||||
 |  | |  | | | |  | | | | | | | | | | | | | |
 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — |
 | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 27 | 27 | 27 | 27 | 28 | 28 | 26 | 27 | 28 | 26 | 26 | 27 | 26 | 27 | 28 | 26 | 26 | 27 | 25 |
Feels °C | 31 | 31 | 31 | 31 | 31 | 28 | 27 | 26 | 25 | 27 | 25 | 25 | 26 | 26 | 27 | 27 | 26 | 24 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SSW 16 | SW 16 | WNW 12 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | SSW 15 | SSW 14 | S 18 | S 19 |
| kJ | 200 | 278 | 291 | 261 | 322 | 326 | 255 | 167 | 201 | 191 | 186 | 166 | 156 | 140 | 119 | 196 | 121 | 215 | 399 | 343 |
Swell 2 Height (m) Direction Period (s) | W 11 | NNE 7 | NNE 7 | NNE 7 | W 10 | NE 6 | W 11 | SW 16 | WNW 12 | NW 12 | NW 12 | NW 12 | SSE 12 | NW 11 | SSW 16 | SSW 12 | SSW 12 | S 18 | SSW 13 | SSW 13 |
| kJ | 55 | 42 | 42 | 32 | 50 | 33 | 58 | 245 | 121 | 142 | 106 | 112 | 81 | 56 | 147 | 81 | 81 | 165 | 135 | 178 |
Swell 3 Height (m) Direction Period (s) | S 11 | W 9 | W 11 | W 10 | S 11 | W 10 | WNW 12 | SE 8 | SSE 13 | SE 8 | S 13 | SSE 12 | NW 11 | SSW 17 | NW 11 | NW 11 | SSE 10 | NW 11 | NW 10 | SSW 16 |
| kJ | 39 | 42 | 56 | 49 | 21 | 73 | 61 | 16 | 101 | 16 | 86 | 85 | 59 | 94 | 57 | 60 | 38 | 40 | 37 | 87 |
Wind waves Height (m) Direction Period (s) | NE 7 | — | — | — | NE 7 | — | NE 6 | ENE 7 | NE 7 | NE 6 | ENE 6 | NE 6 | NE 6 | ENE 6 | ENE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 |
| kJ | 49 | — | — | — | 37 | — | 43 | 56 | 73 | 73 | 59 | 68 | 52 | 43 | 41 | 54 | 40 | 39 | 38 | 34 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 0 | 4 | 0 | 0 | 2 | 6 | 6 | 13 | 9 | 0 | 5 | 5 | 0 | 2 | 5 | 0 | 2 | 0 | 0 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
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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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