Surf Forecasts:
Keaulanas surf forecast from 18 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 11AM (local time) - 2.5ft (0.7m), 13s 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 368 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 11AM (local time) - 2.5ft (0.7m), 13s 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 Tuesday (Aug 18) at 11AM. The primary swell is predicted to be 0.7m 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 0.8m 17s and forecast to arrive on Friday (Aug 21) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 7s period and expected on Monday (Aug 24) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Tue 18th Aug) | 2.5ft (0.7m) 13s |
| Best Surf | 11AM (Tue 18th Aug) | 2.5ft (0.7m) 13s |
| 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 folks, Rusty here. Let’s check out the next couple of weeks. Only one spot in the game – Keaulanas – and it’s gonna be a tale of two halves.
The vibe is small, clean, but surprisingly consistent early on, with one killer window. The water temp is pretty normal for this time of year.
Tuesday the 18th gets us going with 2ft of south swell, a 13-second period, and a nice cross-offshore breeze. Combined energy is moderate (280). By the afternoon the wind goes straight offshore, still clean. Not big, but it’s the start of the good stuff.
Wednesday the 19th drops to 2ft, but the period jumps to 16 seconds – real groundswell. Morning is cross-off and clean, afternoon goes glassy. Combined energy moderate (232 then 169). Keaulanas is a beach and reef setup, so that long period will wrap onto the reef nicely. Could get a few others out there – crowds are possible.
Thursday the 20th – this is the one. The swell is 2ft from the south-west, with an 18-second period in the morning – that’s very long period groundswell. Glassy conditions all day. Combined energy moderate (288). If you’re paddling out only once, this is your session. Clean, lined up, proper waves on the reef.
Then the wheels fall off. Friday the 21st goes cross-onshore, messy. Saturday the 22nd the wind howls to 18 mph cross-offshore by the afternoon, and it’s no good. From Saturday the 22nd all the way through to the end of the month, the wind stays strong from the ENE, 15 to 21 mph, and the surf is small and blown out. Combined energy drops as low as 42 by the 30th. There’s a little window Thursday the 27th afternoon when the wind goes offshore, but the swell is still 2ft with a 16-second period – rideable, but not worth the hype.
The last few days of August into September are a bust. A tiny spike to 4ft on Monday the 31st, but it’s short-period (9 seconds) and the wind is cranking. Choppy mess. Not worth the leash pull.
So, bottom line: get on it early. Thursday the 20th is the standout. After that, it’s a waiting game for the next clean run. Forecasts can change, so keep your board ready.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Thu afternoon, min 24°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Sat morning, min 24°C on Thu night). Winds increasing (calm on Thu night, fresh winds from the ENE by Sun afternoon). | ||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 13 | S 13 | SW 16 | SSW 16 | SSW 16 | SW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SSW 16 | SW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 |
Wave Graph  | |||||||||||||||||||
 kJ | 225 | 165 | 162 | 155 | 129 | 100 | 175 | 249 | 200 | 278 | 291 | 261 | 322 | 326 | 255 | 212 | 201 | 191 | 186 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-off | cross-off | glassy | cross-off | glassy | glassy | glassy | cross-on | cross-on | off | cross-off | cross-off | cross-off | cross-off | off | off |
High Tide | 8:37AM0.52m | 5:51PM0.34m | 9:54AM0.53m | 11:13AM0.55m | 12:17PM0.58m | 11:07PM0.20m | 1:05PM0.61m | 00:41AM0.22m | 1:43PM0.64m | 1:27AM0.24m | |||||||||
Low Tide | 00:54AM0.10m | 3:34PM0.33m | 1:22AM0.12m | 2:02AM0.13m | 3:07AM0.14m | 9:33PM0.20m | 9:13PM0.18m | 5:44AM0.11m | 9:21PM0.17m | ||||||||||
 |  |  | | | | | | | | | | | | | | | |  | |
 | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — |
 | 7:00 | — | 7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 27 | 25 | 26 | 27 | 25 | 27 | 28 | 26 | 26 | 27 | 26 | 28 | 28 | 26 | 27 | 28 | 25 |
Feels °C | 26 | 26 | 27 | 25 | 28 | 30 | 27 | 30 | 31 | 30 | 29 | 30 | 30 | 28 | 26 | 26 | 25 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 13 | S 13 | S 13 | NNE 6 | NNE 6 | SSW 16 | SW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SSW 16 | SW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 |
| kJ | 225 | 165 | 162 | 155 | 28 | 26 | 175 | 249 | 200 | 278 | 291 | 261 | 322 | 326 | 255 | 212 | 201 | 191 | 186 |
Swell 2 Height (m) Direction Period (s) | NE 6 | NE 6 | NE 6 | SW 18 | S 12 | S 12 | NNE 6 | NNE 6 | NNE 7 | NE 7 | NNE 7 | NNE 7 | NE 7 | NE 6 | WNW 13 | WNW 12 | NW 11 | NW 11 | SSE 13 |
| kJ | 47 | 28 | 32 | 79 | 103 | 69 | 24 | 28 | 29 | 38 | 31 | 31 | 36 | 42 | 62 | 121 | 99 | 94 | 98 |
Swell 3 Height (m) Direction Period (s) | S 5 | SSW 17 | SSW 18 | WNW 12 | SW 16 | SSW 16 | S 12 | S 11 | S 11 | S 11 | W 10 | W 10 | W 10 | W 10 | WNW 10 | SSE 12 | SSE 13 | SE 7 | NW 10 |
| kJ | 4 | 115 | 123 | 28 | 129 | 100 | 45 | 39 | 39 | 22 | 35 | 49 | 49 | 52 | 34 | 50 | 101 | 14 | 54 |
Wind waves Height (m) Direction Period (s) | — | — | — | NE 5 | — | — | — | — | — | — | — | — | — | — | ENE 6 | ENE 6 | NE 6 | NE 6 | ENE 6 |
| kJ | — | — | — | 17 | — | — | — | — | — | — | — | — | — | — | 52 | 88 | 76 | 62 | 94 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 24 | 5 | 0 | 2 | 5 | 5 | 9 | 160 | 5 |
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)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Keaulanas surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest