Keaulanas Surf Break

Lat Long: 21.38° N 158.15° W

Keaulanas Surf Forecast and Surf Report

Issued: 7 am 09 Aug 2026 (local time)

Forecast update in  hr  min

Today's Keaulanas sea temperature is
27.0° C
0.4° 

Keaulanas surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Keaulanas surf forecast from 9 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★+): Sunday 9 Aug, 5PM (local time) - 1.5ft (0.5m), 18s 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 Sunday (Aug 09) at 5PM. The primary swell is predicted to be 0.5m and 18s period with a secondary swell of 0.5m 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 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 1.5m 6s period and expected on Sunday (Aug 16) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5PM (Sun 9th Aug)1.5ft (0.5m) 18s
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 folks, Rusty here. Let’s have a look at what Keaulanas has got cookin’ over the next couple of weeks. It’s a bit of a slow burner, but there’s some real quality tucked in there if you’re patient.

The early part of the window is all about small but super clean surf. Sunday morning (August 9th) kicks things off with a tiny 1.6ft groundswell from the SW, but with a very long 16-second period pushing through. The wind is a gentle offshore from the ENE, so it’s gonna be glassy and tidy. The combined swell energy is weak (226), so don’t expect much push, but for a fun little longboard session, it’s a treat. Water temp is sitting at 80.6°, which is about average for this time of year, so you’re not gonna need a steamer.

We roll into Monday and Tuesday with similar vibes – waist-high swell around 2ft to 2.6ft, still that lovely long-period SSW groundswell, and clean conditions. The energy picks up a notch on Tuesday afternoon to moderate (348), but the winds start to go a bit cross-offshore. Still surfable, but the morning sessions are your best bet for that silky surface.

Now, Wednesday the 12th is where things start to rumble. The swell jumps to 3ft in the morning and hits 3.6ft by the afternoon, coming from the S with an 18-second period. The combined energy spikes hard – strong (804) in the morning, then very strong (1247) in the afternoon. That’s a serious step up in power. Winds stay offshore from the ENE, so it’s going to be lined up and clean. This is the first real standout: Wednesday afternoon is the best you’ll see all week for a proper session. That said, at 3.6ft with that kind of period, it’s still friendly for intermediates.

Thursday the 13th keeps that 4.3ft S swell going, with moderate offshore winds in the morning and a fresh offshore in the arvo. The energy is still strong (885) in the morning. But by Friday the 14th, the swell drops back to 3.6ft, and the period shortens to 14 seconds. The quality is still there – it’s clean and offshore – but it’s lost a bit of that Wednesday magic.

The second week gets a bit messy. From the 16th onward, the swell bounces around 2ft to 3ft, but the wind starts swinging onshore and cross-onshore on the 17th, which is a write-off. Keep an eye on Tuesday morning the 18th though – that’s a gem. It’s glassy, dead calm, with a 2.3ft S swell at 13 seconds. Combined energy is moderate (246). It’ll be small, but those dawny glass-offs are worth the paddle.

The very end of the window, around the 21st and 22nd of August, shows some promise again. A 2.6ft SSW groundswell with glassy conditions on Friday morning and Saturday morning. The energy sits in that moderate range (around 397 to 327), and with the wind flat, it’s going to be super clean. A nice way to bookend the outlook.

Overall, the clear standout is Wednesday afternoon, August 12th. That’s the one with the biggest push of S swell (3.6ft), a long 18-second period, and a clean offshore wind. The energy is proper strong (1247), and the break is consistent. Crowds can show up sometimes here, so if you can sneak out mid-week, you’ll have a good chance at some empty ones.

The second standout is Tuesday morning, August 18th – not for size, but for that rare glassy, zero-wind morning on a consistent break. Sometimes that’s all you need.

Short Range Forecast

Mostly dry. Warm (max 29°C on Mon afternoon, min 25°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 29°C on Thu afternoon, min 24°C on Wed night). Mainly fresh winds.

Sunday
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
2
1
2
1
1
2
1
3
2
3
3
3
2
3
3
3
2
2
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.5
SW
16
0.5
S
18
0.8
SSW
16
0.6
SSW
15
0.7
SSW
15
0.7
SSW
15
0.7
SSW
15
0.8
SSW
14
0.7
S
20
0.9
S
18
1.1
S
18
1.4
S
16
1.3
S
16
1.3
S
15
1.2
S
15
1.1
S
14
1.1
S
14
1
S
14
0.9
S
13
0.9
S
13
0.8
S
13
Wave Graph
Metric surfscale
Energy kJ
130
156
288
186
234
240
222
269
373
515
741
1029
868
773
636
496
496
383
280
276
215
Wind (km/h)
15
ENE
20
ENE
20
ENE
15
ENE
20
ENE
15
ENE
15
ENE
20
ENE
15
ENE
25
ENE
25
ENE
20
ENE
20
ENE
30
ENE
20
ENE
20
ENE
25
ENE
20
NE
25
ENE
30
NE
15
NE
Wind State
off
off
cross-off
off
cross-off
cross-off
cross-off
cross-off
off
cross-off
off
cross-off
off
off
off
off
off
off
off
off
off
High Tide
2:02PM0.77m
1:39AM0.23m
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
Low Tide
9:41PM0.14m
7:02AM0.01m
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
clear
part cloud
clear
part cloud
part cloud
clear
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:07
6:09
6:09
6:09
6:09
6:09
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:07
7:06
7:05
7:05
7:04
7:02
7:01
 mm
Temp °C
27
28
26
28
29
26
28
28
26
27
28
25
28
29
25
28
28
26
28
28
26
Feels °C
28
28
27
29
29
26
29
28
26
26
26
24
27
27
24
27
26
26
27
27
26
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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