Surf Forecasts:
Keaulanas surf forecast from 30 Aug 2026:
- Best quality surf: Sunday 30 Aug, 5AM (local time) - 2ft (0.6m), 16s period, SSW swell with offshore winds.
- Most powerful swell: Wednesday 2 Sep, 5AM (local time) - 3ft (0.9m), 16s period, S swell with 438 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 5AM (local time) - 2ft (0.6m), 16s 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 (Aug 30) at 5AM. The primary swell is predicted to be 0.6m and 16s period with a secondary swell of 0.6m and 12s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Keaulanas in the next 16 days are 0.9m 16s and forecast to arrive on Wednesday (Sep 02) at 5AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 7s period and expected on Saturday (Sep 05) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Sun 30th Aug) | 2ft (0.6m) 16s |
| Best Surf | 5AM (Sun 30th Aug) | 2ft (0.6m) 16s |
| Most Powerful | 5AM (Wed 2nd Sep) | 3ft (0.9m) 16s |
Table - best surf conditions forecast for Keaulanas over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what we’ve got.
First up, we’re at Keaulanas (Big Island). This spot is a consistent beach and reef setup that’s exposed to the swell, and it’s best with a west-northwest direction. The water temp is right about average for the time of year, so nothing wild.
The start of the period is quiet. Over Sunday and Monday, we’ve got some small, long-period swell from the SSW, barely 2ft, and the wind is a fresh cross-offshore. It’s clean, but the energy is weak (around 272), so not much to write home about.
Tuesday the 1st of September brings a change. Offshore wind blows in, the swell stays at 2ft, but the period stretches to 18 seconds. The energy jumps to a moderate 455, and the surf starts looking good. That long period groundswell will wrap into the reef nicely.
Wednesday the 2nd keeps the good run. Offshore wind in the morning, 3ft of S swell, 16-second period, and energy at 427. Clean, solid intermediate waves. Wednesday the 9th is a standout: *glassy* conditions with a near-calm breeze, 3ft SSW swell at 14 seconds, and energy at 345. For a reef spot, that’s picture-perfect.
The real highlight, though, is Monday the 8th of September. Morning offshore winds, 4ft of SSW swell at 15 seconds, and the energy jumps to a strong 519. That’s the day Keaulanas will have some proper, lined-up sets with good push. Best on offer across the whole 16 days.
Later in the second week, Thursday the 11th and Friday the 12th offer smaller but clean cross-offshore surf with 2ft and long periods. Nice for a mellow paddle.
There’s a lull around Thursday the 10th with rain showers and choppy onshore winds, and again near the 13th and 14th, the swell drops to almost nothing—1ft to 2ft. Not worth the effort.
So, the best window is Tuesday the 1st through Wednesday the 9th, with Monday the 8th as the big standout. After that, it fades fast. Offshore winds and a moderate SSW swell will give you clean, long rides at the reef. Keep an eye on that glassy morning of the 9th.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Sun afternoon, min 25°C on Sat night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Wed afternoon, min 25°C on Tue night). Mainly fresh winds. | ||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | ||||||||||||||
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 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | S 19 | SSW 18 | S 18 | S 17 | S 16 | S 16 | S 15 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 186 | 226 | 162 | 199 | 191 | 183 | 273 | 333 | 314 | 373 | 427 | 406 | 352 | 268 | 250 | 229 | 170 | 165 | 119 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | off | off | off | off | off |
High Tide | 5:15AM0.50m | 4:54PM0.51m | 6:01AM0.54m | 5:16PM0.44m | 6:54AM0.57m | 5:35PM0.37m | 8:00AM0.58m | 5:33PM0.31m | 9:21AM0.60m | 10:46AM0.63m | |||||||||
Low Tide | 11:00PM0.09m | 11:03AM0.19m | 11:21PM0.08m | 12:00PM0.24m | 11:44PM0.07m | 1:15PM0.28m | 00:13AM0.07m | 3:27PM0.30m | 00:49AM0.08m | 1:42AM0.09m | 3:07AM0.10m | ||||||||
 |  | |  |  | | | | | | | | | | | | | | | |
 | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 6:51 | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 27 | 28 | 26 | 27 | 28 | 25 | 27 | 28 | 26 | 28 | 29 | 26 | 26 | 27 | 25 | 27 | 27 | 26 |
Feels °C | 23 | 25 | 24 | 25 | 25 | 26 | 24 | 26 | 27 | 25 | 28 | 27 | 26 | 25 | 25 | 23 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | S 12 | SSW 16 | S 12 | SSW 15 | SSW 15 | SSW 14 | S 19 | SSW 18 | S 18 | S 17 | NE 8 | S 16 | NE 7 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 |
| kJ | 103 | 226 | 100 | 199 | 191 | 183 | 273 | 333 | 314 | 373 | 94 | 406 | 89 | 268 | 250 | 229 | 170 | 165 | 119 |
Swell 2 Height (m) Direction Period (s) | SSW 17 | SSW 12 | SSW 16 | S 11 | S 11 | S 11 | SSW 14 | SSW 14 | S 12 | SW 14 | S 16 | S 12 | S 15 | S 10 | SSE 10 | E 12 | E 14 | SSW 13 | ESE 8 |
| kJ | 186 | 46 | 162 | 87 | 57 | 82 | 127 | 78 | 77 | 50 | 427 | 69 | 352 | 52 | 33 | 11 | 14 | 17 | 26 |
Swell 3 Height (m) Direction Period (s) | W 12 | SSE 12 | W 11 | SE 6 | S 8 | SSW 19 | S 10 | S 10 | SW 14 | S 10 | SSE 10 | SW 13 | S 11 | SW 13 | SSW 13 | SW 18 | SE 14 | E 14 | SE 12 |
| kJ | 11 | 48 | 9 | 10 | 11 | 123 | 53 | 44 | 53 | 33 | 33 | 27 | 59 | 27 | 17 | 12 | 8 | 14 | 22 |
Wind waves Height (m) Direction Period (s) | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NE 8 | NE 7 | NE 7 | NE 7 | NE 7 | ENE 8 | NE 8 | ENE 8 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 |
| kJ | 156 | 109 | 121 | 91 | 174 | 160 | 137 | 137 | 137 | 134 | 197 | 108 | 181 | 104 | 115 | 84 | 143 | 169 | 149 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 16 | 5 | 14 | 2 | 5 | 6 | 2 | 0 | 160 | 0 | 0 | 6 | 2 | 6 | 164 | 0 | 162 | 167 | 167 |
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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