Nanakuli Blackrocks Surf Break

Lat Long: 21.37° N 158.14° W

Nanakuli Blackrocks Surf Forecast and Surf Report

Issued: 1 pm 19 Jul 2026 (local time)

Forecast update in  hr  min

Today's Nanakuli Blackrocks sea temperature is
26.6° C
0.3° 

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


Nanakuli Blackrocks surf forecast from 20 Jul 2026:

  • Best quality surf: Tuesday 21 Jul, 11PM (local time) - 3ft (0.9m), 13s period, S swell with offshore winds.
  • Most powerful swell: Saturday 25 Jul, 8PM (local time) - 3.5ft (1.1m), 18s period, SSW swell with 790 kJ wave energy.
  • Next surfable swell (1★+): Sunday 19 Jul, 8PM (local time) - 1.5ft (0.5m), 18s period with S swell.

Best Forecast Surf Conditions for Nanakuli Blackrocks this week:

The surf forecast for Nanakuli Blackrocks over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Jul 19) at 8PM. 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 Nanakuli Blackrocks in the next 16 days are 1.1m 18s and forecast to arrive on Saturday (Jul 25) at 8PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.1m 7s period and expected on Friday (Jul 24) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Sun 19th Jul)1.5ft (0.5m) 18s
Best Surf11PM (Tue 21st Jul)3ft (0.9m) 13s
Most Powerful 8PM (Sat 25th Jul)3.5ft (1.1m) 18s

Table - best surf conditions forecast for Nanakuli Blackrocks over the next 16 days.


The Lowdown

Alright folks, Rusty here. Let's talk about the surf outlook for Nanakuli Blackrocks.

First up, this spot is a bit of a tricky one. It's a rarely breaks kinda place, so when it's on, it's special, but you gotta be patient. The water's sitting about average for this time of year, so no surprises there.

We're looking at a pretty long stretch ahead. The first real action kicks off from Sunday the 19th, but honestly, it's a slow start. The swell is tiny at 2ft from the south, and while the wind is offshore, the wave energy is moderate (233). It's more of a paddle and a hope than a session to write home about.

Things pick up a notch on Monday the 20th and Tuesday the 21st. The swell stays small, around 3ft, but it's got some serious grunt with a period of 16 seconds from the south. That's a proper groundswell, which means better shaped waves, but for a spot like this, it might be a bit too straight. The wind is offshore and light, staying clean. The energy is moderate (417 and 402), feeling a bit more alive.

Now, the standout for the first week is shaping up for Wednesday the 22nd. The swell is still only 2ft, but the period jumps to a massive 24 seconds from the SSW. That's a very long period groundswell, bringing in heaps of energy (714). The wind is offshore and clean. It's a rare setup for a spot that rarely breaks, so if you're a local who knows the peak, this could be the window. The strong energy (714) backs up the quality.

Thursday the 23rd and Friday the 24th see the swell direction holding from the SSW, with periods dropping from 20 down to 17 seconds. The height stays around 2ft to 3ft, but the wind picks up to a fresh 30 km/h offshore. The energy is still strong, hitting 849 on Friday afternoon, but that fresh breeze will have the surface a bit textured.

Moving into the second week, the pattern holds. Saturday the 25th has a solid 3ft swell from the SSW with a 19-second period and strong energy (746), but that strong offshore wind is still there. Sunday the 26th through Tuesday the 28th keep the same story: small south swell, 2ft to 3ft, with periods from 16 down to 13 seconds, and mostly offshore winds. The energy drops off a bit, settling into moderate territory (288-187).

The real potential for a true standout arrives at the end of the month. Friday the 31st of July looks like a gem. The wind goes glassy calm, and the swell jumps to 4ft from the SSE with a 12-second period. That's a solid, fun size for intermediates, and the energy is high (739). With glassy conditions and that swell, this is the best on offer in the whole outlook. The only downside is the SSE direction might not be the absolute sweet spot for this spot, which prefers a WSW swell, but the quality of the conditions is too good to ignore.

The first few days of August are a bit of a fade-out, with small 3ft swell and moderate energy, but it's still rideable with offshore winds.

So, to wrap it up, the best session is locked in for Friday the 31st of July in the afternoon with that glassy 4ft swell. For a rare break, the Wednesday the 22nd with the 24-second period is a close second for the sheer novelty. The rest of the window is small but consistent, so keep your expectations in check.

Rusty, signing off.

Short Range Forecast

Mostly dry. Warm (max 28°C on Sun afternoon, min 24°C on Sun night). Wind will be generally light.

Days 5-7 Weather Summary

Mostly dry. Warm (max 27°C on Wed afternoon, min 24°C on Fri night). Mainly fresh winds.

Sun
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
2
2
2
2
2
3
3
2
3
2
2
2
2
2
3
3
2
3
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
S
13
0.5
SSW
11
0.9
S
16
0.6
S
16
0.9
S
15
0.9
S
14
0.9
S
14
0.9
S
13
0.6
SSW
24
0.6
SSW
23
0.7
SSW
22
0.8
SSW
20
0.7
SSW
20
0.9
SSW
18
0.7
SSW
18
0.9
SSW
17
0.8
SSW
16
0.8
SSW
19
1
SSW
18
1
SSW
18
Wave Graph
Metric surfscale
Energy kJ
126
71
417
186
343
329
311
281
437
426
480
523
399
464
329
423
298
502
685
662
Wind (km/h)
25
ENE
15
ENE
10
NE
25
ENE
15
ENE
15
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
30
ENE
30
ENE
25
ENE
30
ENE
30
ENE
25
ENE
25
ENE
30
ENE
25
ENE
Wind State
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
High Tide
7:08PM0.48m
9:44AM0.47m
7:23PM0.40m
10:58AM0.52m
12:00PM0.57m
12:51PM0.61m
1:33PM0.64m
00:26AM0.22m
2:12PM0.67m
1:26AM0.22m
Low Tide
2:19AM0.10m
3:17PM0.35m
2:50AM0.11m
3:27AM0.11m
4:14AM0.11m
5:08AM0.10m
9:51PM0.20m
6:03AM0.09m
10:04PM0.18m
clear
clear
clear
part cloud
clear
part cloud
part cloud
part cloud
clear
clear
part cloud
part cloud
clear
part cloud
clear
clear
clear
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
6:01
6:01
6:01
6:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:15
7:15
7:15
7:15
7:15
7:15
7:14
 mm
Temp °C
28
25
27
28
25
27
28
25
27
27
25
27
27
25
27
27
25
27
27
25
Feels °C
25
24
28
28
25
28
28
24
26
24
24
25
24
23
24
24
23
25
24
23
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  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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Information about the Nanakuli Blackrocks Surf forecast

The above surf forecast table for Nanakuli Blackrocks provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Nanakuli Blackrocks can be found by selecting the local surf guide option on the grey menu. Our Nanakuli Blackrocks 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 (Nanakuli Blackrocks) 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 Nanakuli Blackrocks 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.

Nanakuli Blackrocks is 6 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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