
Surf Forecasts:
Keaulanas surf forecast from 8 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 2AM (local time) - 3ft (0.9m), 14s period, SSW swell with glassy winds.
- Most powerful swell: Tuesday 8 Sep, 11AM (local time) - 8ft (2.5m), 10s period, SSW swell with 1,348 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 2AM (local time) - 3ft (0.9m), 14s 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 Wednesday (Sep 09) at 2AM. The primary swell is predicted to be 0.9m and 14s period with a secondary swell of 1.2m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Keaulanas in the next 16 days are 2.5m 10s and forecast to arrive on Tuesday (Sep 08) at 11AM. Winds are predicted to be cross-onshore 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 10) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Wed 9th Sep) | 3ft (0.9m) 14s |
| Best Surf | 2AM (Wed 9th Sep) | 3ft (0.9m) 14s |
| Most Powerful | 11AM (Tue 8th Sep) | 8ft (2.5m) 10s |
Table - best surf conditions forecast for Keaulanas over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s talk about the stretch ahead.
The opening days are a bit of a washout. Tuesday’s got some bumpy, cross-onshore wind and a messy 8ft of short-period swell. Not worth your time. But hold on, because things glass off nicely from Wednesday morning. The wind drops right out, and we get a clean 3ft of long-period SSW groundswell rolling through Keaulanas (Big Island). It’s not huge, but it’s lined up and the water’s sitting at a normal 81°F for this time of year. That’s a decent window to get wet.
Wednesday afternoon stays glassy too, with a touch less energy. The swell dips a bit on Thursday, dropping to 2ft, even though the period stretches out. It’s clean with cross-offshore winds, but it’s marginal. Friday and Saturday look like more of the same – small but clean, with the swell holding around 2ft and periods in the sweet spot. These are good days for a longboard or a fish, just getting some nice lines.
Sunday’s still clean but the swell’s fading fast, down to 1ft to 2ft. It’s surfable, but ordinary. Then we hit that mid-week lull. Monday’s tiny. Then there’s a real standout hiding in the second week. Tuesday the 15th, the energy jumps back up, with a combined energy reading of 531, and we’ve got 3ft of SSW groundswell at 20 seconds. That’s proper groundswell. Winds are light cross-off, so it should be shaping up nicely. Wednesday the 16th looks even better – 3ft at 18 seconds, with a combined energy of 575 to 630, and a glassy afternoon session on the cards. That’s the pick of the bunch so far.
After that, the consistency gets more questionable. There’s a pulse of 4ft on Thursday the 17th, but it’s from the NW and the period drops to 12 seconds, and the wind picks up. Then we see a run of days with moderate cross-offshore winds and a lot of “marginal” surf. The swell stays around 3ft to 4ft, but it’s not as clean as the mid-week highlight. The wind stays pretty stiff – 15 to 18 mph at times – so the surface is going to get chopped up.
Right at the end of the window, on Tuesday the 22nd, there’s another glimmer. A moderate offshore wind kicks in and the swell turns to the NNW, with 3ft at 14 seconds and a combined energy of 509. That could be a fun, clean drop-in. And Wednesday the 23rd has a similar story, with a bit more push from the SSW.
So, bottom line: the first few days are a wash. The standout is definitely Wednesday the 16th – clean, glassy, with a solid SSW groundswell. The Tuesday the 15th is a close second. The stretches in between are small or windy, so pick your windows carefully. There are a few longer gaps of a couple days where it just won’t be worth paddling out.
Rusty out.
Short Range ForecastLight rain (total 5mm), mostly falling on Tue morning. Warm (max 28°C on Tue afternoon, min 24°C on Thu night). Winds decreasing (fresh winds from the SSW on Tue morning, calm by Wed afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Fri morning). Wind will be generally light. | ||||||||||||||||||||
Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | |||||||||||||||
AM | 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 10 | SSW 8 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 16 | SSW 18 | SW 16 | SW 16 | SW 15 | SSW 15 | SW 15 | SW 16 | SSW 13 | SW 15 | SSW 15 | SSW 14 | SSW 14 | SW 22 | SW 21 |
Wave Graph | |||||||||||||||||||||
1348 | 550 | 356 | 336 | 257 | 176 | 181 | 211 | 268 | 258 | 229 | 283 | 242 | 124 | 116 | 107 | 84 | 134 | 76 | 227 | 224 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | glassy | glassy | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | glassy | off | off | cross-off | cross-off |
High Tide | 2:17PM0.71m | 2:34AM0.38m | 2:53PM0.68m | 3:15AM0.44m | 3:25PM0.64m | 3:55AM0.50m | 3:54PM0.58m | 4:35AM0.55m | 4:21PM0.51m | 5:14AM0.58m | 4:45PM0.44m | 5:56AM0.59m | 5:04PM0.37m | ||||||||
Low Tide | 9:14PM0.10m | 8:03AM0.08m | 9:35PM0.09m | 8:55AM0.10m | 9:55PM0.08m | 9:44AM0.13m | 10:16PM0.07m | 10:34AM0.16m | 10:36PM0.07m | 11:26AM0.20m | 10:56PM0.08m | 12:24PM0.24m | 11:16PM0.09m | ||||||||
6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | |
mm | 1 | — | — | — | — | 2 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 28 | 27 | 28 | 28 | 27 | 27 | 28 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 28 | 27 |
Feels °C | 27 | 29 | 30 | 32 | 33 | 31 | 27 | 29 | 27 | 28 | 29 | 27 | 29 | 29 | 27 | 30 | 30 | 28 | 30 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | W 9 | W 8 | SSW 8 | SSW 14 | SSW 13 | NW 9 | NE 7 | SSW 12 | NE 7 | SW 16 | SW 15 | SSW 15 | SW 15 | NE 8 | NE 9 | NE 8 | NE 8 | NE 8 | SSW 14 | SW 22 | NNE 8 |
486 | 164 | 197 | 336 | 257 | 144 | 77 | 172 | 47 | 258 | 229 | 283 | 242 | 54 | 75 | 84 | 82 | 84 | 76 | 227 | 56 | |
Swell 2 Height (m) Direction Period (s) | SSW 15 | SSW 15 | SSW 14 | SSW 8 | SSW 7 | SSW 13 | SSW 13 | SSW 18 | SW 16 | NE 7 | NE 7 | NE 7 | NNE 8 | SW 16 | SSW 13 | SW 15 | SSW 15 | SSW 14 | SW 9 | SW 14 | SW 21 |
481 | 456 | 356 | 88 | 43 | 176 | 173 | 211 | 268 | 41 | 65 | 43 | 40 | 124 | 116 | 107 | 84 | 134 | 13 | 49 | 224 | |
Swell 3 Height (m) Direction Period (s) | ENE 11 | ENE 11 | NE 10 | NE 9 | NE 8 | NE 8 | SSW 16 | NW 7 | S 12 | SW 9 | SSW 11 | SW 8 | SSW 10 | SW 13 | SW 16 | SSW 12 | SW 12 | SW 24 | SSW 24 | SW 8 | SSW 13 |
100 | 154 | 122 | 50 | 42 | 45 | 181 | 13 | 73 | 29 | 43 | 18 | 22 | 87 | 64 | 57 | 37 | 87 | 54 | 11 | 68 | |
Wind waves Height (m) Direction Period (s) | SSW 10 | SSW 8 | — | — | — | — | E 7 | NE 7 | ENE 7 | E 7 | — | — | — | — | ENE 5 | — | — | — | NE 8 | NE 8 | — |
1348 | 550 | — | — | — | — | 127 | 75 | 79 | 57 | — | — | — | — | 22 | — | — | — | 70 | 98 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 146 | 35 | 0 | 0 | 0 | 0 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 |
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.










