
Surf Forecasts:
Keaulanas surf forecast from 13 Sep 2026:
- Best quality surf: Tuesday 15 Sep, 5AM (local time) - 2.5ft (0.7m), 21s period, SW swell with offshore winds.
- Most powerful swell: Friday 18 Sep, 2AM (local time) - 3.5ft (1.1m), 18s period, SSW swell with 768 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 2AM (local time) - 2ft (0.6m), 13s 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 Sunday (Sep 13) at 2AM. The primary swell is predicted to be 0.6m and 13s 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 1.1m 18s and forecast to arrive on Friday (Sep 18) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 7s period and expected on Thursday (Sep 17) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Sun 13th Sep) | 2ft (0.6m) 13s |
| Best Surf | 5AM (Tue 15th Sep) | 2.5ft (0.7m) 21s |
| Most Powerful | 2AM (Fri 18th Sep) | 3.5ft (1.1m) 18s |
Table - best surf conditions forecast for Keaulanas over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s take a look at what we’ve got cooking at Keaulanas over the next couple of weeks.
First up, we’re looking at a mellow start. The water temp is sitting right around average for this time of year, nothing wild. Keaulanas is a consistent, exposed beach-and-reef setup that likes a west swell, and we’ve got some long-period groundswell rolling in from the southwest.
Sunday the 13th is pretty quiet. We’re looking at tiny 2ft to 1ft waves with a very long 15-second period, but the wind is glassy. It’s surfable, but it’s not going to get your heart racing. The combined energy is weak (144). Monday the 14th sees a bit more life in the afternoon. The swell bumps to 2ft but the period jumps to a very long 22 seconds, and the energy starts to build (275). The wind is light and cross-off, so the setup is clean. It’s getting more interesting, but still small.
Now, Tuesday the 15th is where it starts to look good. Morning shows 3ft from the SSW with a long 20-second period and a solid bump in energy (531). The wind is glassy, turning to light offshore in the afternoon. This is clean and building. Wednesday the 16th is the real standout. The morning brings 3ft SSW swell with an 18-second period and strong energy (575). The wind is offshore and moderate, so expect clean, fun lines. This is the best of the first week – consistent, clean, and with enough push to make it interesting for the intermediate crew.
Thursday the 17th and Friday the 18th hold similar 3ft to 4ft SSW swell, but the wind freshens up. We’re looking at fresh offshore or moderate cross-off breezes, which keeps it clean, but the conditions get a bit more challenging with the stronger wind. The energy stays strong (up to 720 on Friday), but the quality is more marginal. It’s still surfable, but you’ll need to be on your game. Saturday the 19th and Sunday the 20th see the swell drop back to 2ft to 3ft, with energy fading and conditions turning poor by Sunday afternoon. The wind is still moderate cross-off, but the magic is gone.
We hit a real dry spell from Monday the 21st through Wednesday the 23rd. The swell is small, the period is short, and the conditions are poor. This is a gap of several days with nothing to write home about. Thursday the 24th and Friday the 25th show a slight uptick, with 3ft SSW swell and a return of longer period (14-15 seconds) and moderate energy (414-503). The wind is offshore or cross-off, so it’s clean, but it’s still marginal. Saturday the 26th and Sunday the 27th are a bit better, with 2ft to 3ft SSW swell and lighter winds. Expect good, clean surf, but nothing massive.
Finally, Monday the 28th brings a bit of a surprise. The swell is only 2ft, but it’s a long-period 18-second groundswell from the SSW with moderate energy (451). The wind goes glassy again. It’s small, but for the patient surfer, it could offer some clean, fun waves on the reef.
Overall, the best bet is Wednesday the 16th. It’s got the best combo of size, period, and clean offshore wind. After that, the second week is more of a watch-and-wait situation. It’s not terrible, but you’ll need to pick your moments.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Tue afternoon, min 24°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 4mm), mostly falling on Fri afternoon. Warm (max 28°C on Wed morning, min 26°C on Tue night). Mainly fresh winds. | ||||||||||||||||||
Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | ||||||||||||||
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 13 | SW 15 | SSW 15 | SSW 14 | SSW 14 | SW 22 | SW 21 | SSW 20 | SW 19 | SW 19 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 |
Wave Graph | |||||||||||||||||||
116 | 107 | 84 | 134 | 76 | 227 | 224 | 490 | 384 | 535 | 541 | 541 | 510 | 322 | 322 | 768 | 622 | 684 | 539 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | glassy | off | cross-off | cross-off | cross-off | cross-off | off | off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off |
High Tide | 5:14AM0.58m | 4:45PM0.44m | 5:56AM0.59m | 5:04PM0.37m | 6:41AM0.58m | 5:14PM0.32m | 7:35AM0.57m | 8:46AM0.55m | 10:11AM0.54m | ||||||||||
Low Tide | 10:36PM0.07m | 11:26AM0.20m | 10:56PM0.08m | 12:24PM0.24m | 11:16PM0.09m | 1:38PM0.27m | 11:37PM0.10m | 00:02AM0.12m | 00:34AM0.14m | 1:44AM0.17m | |||||||||
— | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | |
6:37 | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — |
Temp °C | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 27 | 28 | 27 | 28 | 28 | 26 | 27 | 28 | 26 | 27 | 28 | 26 |
Feels °C | 27 | 28 | 30 | 28 | 27 | 28 | 27 | 30 | 31 | 29 | 28 | 27 | 26 | 26 | 28 | 27 | 28 | 30 | 26 |
Swell 1 Height (m) Direction Period (s) | NE 9 | NE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NNE 8 | SSW 20 | SW 19 | SW 19 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 |
79 | 79 | 75 | 75 | 70 | 69 | 44 | 490 | 384 | 535 | 541 | 541 | 510 | 322 | 322 | 768 | 622 | 684 | 539 | |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SW 15 | SSW 15 | SSW 14 | SSW 14 | SW 22 | SW 21 | NNE 8 | NNE 8 | NNE 8 | SW 12 | SW 11 | SW 11 | SSW 20 | SSW 19 | E 10 | SSE 10 | SSE 7 | SSE 8 |
116 | 107 | 84 | 134 | 76 | 227 | 224 | 56 | 52 | 51 | 34 | 31 | 19 | 216 | 210 | 29 | 9 | 18 | 44 | |
Swell 3 Height (m) Direction Period (s) | SSW 16 | SW 12 | SW 12 | SW 24 | SSW 24 | SW 14 | SSW 13 | SW 13 | SW 12 | SW 12 | NNE 9 | ESE 10 | SSW 21 | SW 10 | E 10 | SSE 10 | W 9 | S 21 | S 20 |
98 | 37 | 37 | 87 | 54 | 48 | 68 | 41 | 38 | 37 | 8 | 10 | 42 | 17 | 18 | 10 | 2 | 36 | 67 | |
Wind waves Height (m) Direction Period (s) | — | — | — | E 4 | E 5 | E 5 | E 5 | — | — | E 5 | NE 7 | NE 9 | NE 7 | NE 7 | NE 7 | NE 7 | ENE 7 | ENE 7 | ENE 7 |
— | — | — | 8 | 11 | 15 | 12 | — | — | 19 | 43 | 112 | 105 | 134 | 130 | 105 | 127 | 134 | 114 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 160 | 0 | 160 | 160 | 2 | 9 | 2 | 0 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










