
Surf Forecasts:
Keaulanas surf forecast from 11 Aug 2026:
- Best quality surf: Thursday 13 Aug, 5AM (local time) - 4.5ft (1.4m), 16s period, S swell with offshore winds.
- Most powerful swell: Thursday 13 Aug, 2AM (local time) - 4.5ft (1.4m), 16s period, S swell with 1,029 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 2AM (local time) - 2.5ft (0.7m), 15s 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 Tuesday (Aug 11) at 2AM. The primary swell is predicted to be 0.7m and 15s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Keaulanas in the next 16 days are 1.4m 16s and forecast to arrive on Thursday (Aug 13) 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 4.5m 9s period and expected on Sunday (Aug 16) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Tue 11th Aug) | 2.5ft (0.7m) 15s |
| Best Surf | 5AM (Thu 13th Aug) | 4.5ft (1.4m) 16s |
| Most Powerful | 2AM (Thu 13th Aug) | 4.5ft (1.4m) 16s |
Table - best surf conditions forecast for Keaulanas over the next 16 days.
The Lowdown
Alright, let’s take a look at what’s on offer for Keaulanas. First thing you’ll notice is that we’ve got a bit of a slow start. The beginning of the forecast period isn't exactly firing, but don't write it off too early. There’s a slow build through the middle of the month, and the back half of the forecast window actually starts to shape up nicely, especially if you’re willing to wait.
We’ve got an exposed west-facing setup here at Keaulanas; a beach and reef mix that needs a good push of south or southwest swell to really wake up. Water temp sits around 81°F with about a 0.6°F anomaly—so pretty much bang on average for this time of year. Nothing weird going on with the water temp, the ocean is in its normal rhythm.
Alright, let’s talk about the first stretch. From Monday the 10th through to Saturday the 15th, we’re looking at small south-southwest groundswell. The swell hangs around 2.3 ft to 3 ft with periods of 13 to 18 seconds. The energy is moderate, with combined swell energy readings between 262 and 1247. Tuesday morning the 11th has clean waves at 2.3 ft from the SSW, 15-second period, and light east winds—a nice little session for a longboard or a fish, nothing too exciting but pleasant enough. The standout in this early window is actually Wednesday afternoon the 12th. We see a pulse of S swell at 3.6 ft with an 18-second period; combined energy jumps to 1247 (moderate) and the wind is offshore from the ENE at 15.5 mph. It’s going to be clean, lined up, and that long period groundswell will be hitting the reef nicely. That said, with such a long period (18 seconds) at a beach and reef setup, expect the peaks to be a bit fat on the sand, but it’ll lean into the reef for some proper shapes. Keep an eye on the tide, though—the outlook flags possible tide issues.
Thursday morning the 13th is also worth a mention: 4.3 ft from the S, 16-second period, offshore ENE breeze at 15.5 mph, combined energy at 893. That’s clean head-high stuff, and the wind stays off all day. Good wave quality, moderate energy, and the sets will have some push. Thursday afternoon the breeze picks up to 18.6 mph but it’s still offshore, so it stays clean but gets a bit more textured.
Friday the 14th and Saturday the 15th are still surfable but dropping: 3.6 ft down to 2.6 ft, period shortening to 13 seconds, and the wind swings a bit more north-east, but still offshore. It’s rideable, but nothing to write home about—more of a fun morning session before the wind gets a bit fresh.
Now here’s where things get ugly. Sunday the 16th is a complete write-off. We’ve got a SSE gale blowing 40.4 mph with cross-shore winds, combined with rain and thunderstorms. Swell is down to 1.6 ft–2 ft and the conditions are poor. Not a day to be in the water. Keep the board in the car and go find something else to do.
Monday the 17th through Wednesday the 19th is a flat, mushy period. Swell stays tiny at 1.6 ft to 3 ft, periods are still decent (14 to 16 seconds) but the wind is mostly cross or light cross-off, and the energy is weak—combined swell energy readings are between 129 and 621. It’s surfable but ordinary. You’d be scratching for waves, and the quality just isn’t there.
But then we get the real standouts toward the end. From Thursday the 20th to Saturday the 22nd, things clean up nicely. Thursday the 20th: 2 ft SSW groundswell, 18-second period, and glassy light ENE winds in the morning. The combined energy is 204—still on the lower side, but the wave shape will be clean and the conditions will be super user-friendly. This is a good window for the intermediate crew. Friday the 21st morning is even better: 2.3 ft SW swell, 16-second period, and the wind goes glassy. Dead calm. That’s your dawn patrol sweet spot. Combined energy sits at 315, so it’s weak-to-moderate, but the quality will make up for it. Crowds are possible, but it’s worth it.
Saturday the 22nd morning keeps that clean theme: 2.3 ft from the SSW, 16-second period, light ENE breeze, cross-off but clean. Easy paddling, long period means longer lulls, better shape on the reef. Very pleasant.
Now, looking way out
Short Range ForecastMostly dry. Warm (max 28°C on Mon afternoon, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 37mm), heaviest during Sat night. Warm (max 28°C on Thu afternoon, min 25°C on Thu night). Winds increasing (moderate winds from the NE on Fri night, gales from the SSE by Sun morning). | |||||||||||||||||||
Mon 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | ||||||||||||||
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 15 | SSW 15 | SSW 15 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | S 17 | S 16 | S 7 |
Wave Graph | ||||||||||||||||||||
234 | 240 | 222 | 269 | 373 | 509 | 741 | 1029 | 868 | 773 | 636 | 503 | 411 | 315 | 280 | 222 | 219 | 195 | 127 | 537 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross-off | off | cross-off | off | cross-off | off | off | off | off | off | off | off | off | cross-off | cross | cross | cross |
High Tide | 2:45PM0.79m | 2:33AM0.27m | 3:24PM0.79m | 3:22AM0.32m | 4:00PM0.76m | 4:10AM0.37m | 4:33PM0.71m | 4:57AM0.42m | 5:03PM0.63m | 5:45AM0.46m | 5:29PM0.55m | 6:36AM0.49m | 5:51PM0.47m | |||||||
Low Tide | 10:06PM0.12m | 7:57AM0.01m | 10:31PM0.10m | 8:49AM0.02m | 10:56PM0.10m | 9:38AM0.06m | 11:20PM0.09m | 10:27AM0.12m | 11:44PM0.09m | 11:19AM0.18m | 00:07AM0.09m | 12:16PM0.25m | 00:30AM0.09m | |||||||
— | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | |
7:06 | — | — | 7:05 | — | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — | — | 7:01 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 24 | 13 | 27 | 2 |
Temp °C | 28 | 26 | 27 | 28 | 26 | 26 | 28 | 25 | 28 | 28 | 25 | 27 | 28 | 25 | 28 | 28 | 26 | 26 | 27 | 26 |
Feels °C | 29 | 26 | 28 | 28 | 26 | 26 | 27 | 24 | 26 | 26 | 25 | 25 | 26 | 24 | 27 | 26 | 24 | 27 | 25 | 26 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 13 | S 18 | S 13 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | E 14 | E 14 | S 13 | NNE 8 |
234 | 240 | 222 | 269 | 299 | 509 | 392 | 1029 | 868 | 773 | 636 | 503 | 411 | 315 | 280 | 222 | 302 | 988 | 117 | 92 | |
Swell 2 Height (m) Direction Period (s) | SSW 12 | ENE 7 | ENE 7 | SE 9 | S 20 | SSW 13 | S 18 | WNW 12 | W 12 | W 12 | W 11 | W 12 | SSW 18 | ESE 10 | E 13 | E 13 | S 13 | S 13 | S 16 | ENE 10 |
45 | 35 | 31 | 20 | 373 | 289 | 741 | 28 | 25 | 11 | 10 | 11 | 30 | 33 | 117 | 171 | 219 | 114 | 127 | 115 | |
Swell 3 Height (m) Direction Period (s) | NNW 8 | SSE 9 | SSW 11 | S 21 | ENE 7 | SE 9 | SW 18 | SE 9 | SE 9 | NNW 8 | NNW 7 | NNW 7 | W 12 | NNW 9 | NNW 8 | NNW 8 | S 18 | S 17 | WNW 12 | NE 9 |
24 | 33 | 40 | 79 | 29 | 19 | 12 | 13 | 12 | 6 | 5 | 5 | 11 | 16 | 14 | 13 | 99 | 195 | 27 | 50 | |
Wind waves Height (m) Direction Period (s) | NE 7 | — | E 7 | ENE 7 | E 7 | ENE 6 | N 12 | NE 6 | NE 6 | NE 6 | NE 6 | NE 7 | NE 7 | NE 7 | NE 7 | NE 7 | NNE 7 | NNE 8 | NE 9 | S 7 |
42 | — | 106 | 29 | 106 | 33 | 102 | 45 | 52 | 56 | 75 | 97 | 102 | 113 | 144 | 183 | 362 | 1261 | 3361 | 537 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 2 | 0 | 0 | 2 | 0 | 2 | 6 | 2 | 0 | 160 | 0 | 6 | 160 | 0 | 167 | 167 | 148 | 187 | 176 | 23 |
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.











