Surf Forecasts:
Keaulanas surf forecast from 13 Aug 2026:
- Best quality surf: Thursday 13 Aug, 8AM (local time) - 4.5ft (1.4m), 16s period, S swell with offshore winds.
- Most powerful swell: Thursday 13 Aug, 8AM (local time) - 4.5ft (1.4m), 16s period, S swell with 1,004 kJ wave energy.
- Next surfable swell (1★+): Thursday 13 Aug, 8AM (local time) - 4.5ft (1.4m), 16s 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 Thursday (Aug 13) at 8AM. The primary swell is predicted to be 1.4m and 16s period with a secondary swell of 0.3m 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 1.4m 16s and forecast to arrive on Thursday (Aug 13) at 8AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 8s period and expected on Sunday (Aug 16) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Thu 13th Aug) | 4.5ft (1.4m) 16s |
| Best Surf | 8AM (Thu 13th Aug) | 4.5ft (1.4m) 16s |
| Most Powerful | 8AM (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 run through what’s on the table. It’s a quiet stretch, no doubt. The only spot doing anything this whole period is Keaulanas, and the good news is, there are a couple of sessions that’ll get you wet.
Right out of the gate, Thursday August 13th morning is the pick of the whole two weeks. We’ve got a 4ft southerly groundswell, a long 16-second interval, and a clean offshore breeze out of the ENE. The combined energy is moderate (899), and it’s clean, offshore conditions. Waves will be in the waist-to-shoulder range. Water temp is about average for the season.
That’s the high point, though. By that afternoon, the swell holds but wind picks up a bit, and from Friday afternoon through the weekend it gets small. Saturday and Sunday see 3ft to 2ft southerly swell with strong offshore to cross-off winds. It’s clean but tiny and hard to paddle into. Big boards or a nap – your call.
There’s a lull in quality from the 16th to the 19th, but Tuesday August 20th morning shows a little 2ft SSW groundswell with an 18-second period and glassy conditions on the 21st. That Friday morning is the second clear standout: flat calm, 0 ft wind, and a 2ft SW groundswell rolling in. It’ll be clean, glassy, and lined up – perfect for a longboard.
After that, it’s back to tiny 2-3ft waves with cross-off winds through the final week. By August 28th, it’s marginal and not worth burning a day off.
So, bottom line: Thursday August 13th morning and Friday August 21st morning are your two windows for truly clean, fun surf at Keaulanas. The rest is small and either windy or fading. This is a normal flat spell for the area, but forecasts can change. I’m not calling it dead yet.
– Rusty
Short Range ForecastMostly dry. Warm (max 28°C on Thu morning, min 25°C on Thu night). Mainly strong winds. | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Sun afternoon. Warm (max 28°C on Tue afternoon, min 25°C on Sun afternoon). Winds decreasing (strong winds from the NE on Sun morning, light winds from the ENE by Tue night). | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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) | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | S 16 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | SW 16 | SSW 16 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 868 | 773 | 636 | 503 | 496 | 311 | 280 | 168 | 225 | 158 | 183 | 239 | 338 | 329 | 285 | 215 | 162 | 114 | 129 | 100 | 175 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | off | off | off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off |
High Tide | 4:33PM0.71m | 4:57AM0.42m | 5:03PM0.63m | 5:45AM0.46m | 5:29PM0.55m | 6:36AM0.49m | 5:51PM0.47m | 7:32AM0.51m | 6:05PM0.40m | 8:37AM0.52m | 5:51PM0.34m | 9:54AM0.53m | |||||||||
Low Tide | 9:38AM0.06m | 11:20PM0.09m | 10:27AM0.12m | 11:44PM0.09m | 11:19AM0.18m | 00:07AM0.09m | 12:16PM0.25m | 00:30AM0.09m | 1:28PM0.30m | 00:54AM0.10m | 3:34PM0.33m | 1:22AM0.12m | 2:02AM0.13m | ||||||||
 | |  | | |  | | | |  |  |  | | | | | | | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — |
mm | — | — | — | — | — | — | — | — | — | — | 6 | 3 | 2 | 2 | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 26 | 28 | 28 | 26 | 27 | 28 | 26 | 26 | 27 | 26 | 26 | 27 | 26 | 27 | 28 | 26 | 27 | 28 | 26 |
Feels °C | 26 | 25 | 26 | 26 | 26 | 25 | 25 | 25 | 24 | 23 | 26 | 24 | 27 | 28 | 27 | 27 | 27 | 26 | 28 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | SSE 11 | NE 8 | S 14 | S 14 | S 13 | S 13 | S 13 | NE 6 | NE 7 | S 12 | NE 7 |
| kJ | 868 | 773 | 636 | 503 | 496 | 311 | 280 | 168 | 225 | 158 | 419 | 147 | 338 | 329 | 285 | 215 | 162 | 26 | 35 | 69 | 37 |
Swell 2 Height (m) Direction Period (s) | W 12 | ESE 7 | ESE 8 | ESE 8 | ESE 10 | ESE 10 | W 11 | NNW 8 | S 18 | S 17 | S 16 | SSE 8 | SSE 7 | SSE 6 | WNW 11 | NE 6 | SSW 18 | S 13 | SW 16 | SSW 16 | SSW 16 |
| kJ | 25 | 11 | 26 | 24 | 22 | 21 | 22 | 12 | 99 | 138 | 183 | 149 | 54 | 23 | 24 | 45 | 123 | 114 | 129 | 100 | 175 |
Swell 3 Height (m) Direction Period (s) | NNW 8 | W 12 | W 11 | W 12 | NNW 8 | NNW 8 | NNW 8 | S 16 | WNW 13 | SE 12 | S 13 | S 14 | WNW 11 | WNW 11 | SSW 19 | SSW 17 | WNW 13 | SSE 6 | S 12 | SSE 8 | S 12 |
| kJ | 6 | 11 | 10 | 11 | 6 | 12 | 6 | 43 | 33 | 73 | 125 | 239 | 24 | 24 | 37 | 115 | 34 | 17 | 69 | 28 | 45 |
Wind waves Height (m) Direction Period (s) | NE 6 | NE 5 | NE 6 | NE 6 | NE 7 | NE 7 | ENE 7 | ENE 6 | ENE 8 | ENE 8 | ENE 8 | — | NE 7 | NE 7 | NE 6 | E 7 | NE 6 | ENE 8 | ENE 8 | NE 7 | E 8 |
| kJ | 54 | 47 | 64 | 94 | 102 | 149 | 274 | 288 | 560 | 547 | 326 | — | 99 | 79 | 56 | 106 | 42 | 110 | 107 | 42 | 64 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 11 | 13 | 0 | 11 | 161 | 11 | 163 | 167 | 161 | 167 | 160 | 16 | 2 | 2 | 2 | 2 | 2 | 2 | 0 | 0 | 0 |
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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