Nanakuli Blackrocks surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 7 pm Friday 22 May 2026 HST
Forecast update in hr  min  s Forecast update imminent
Nanakuli Blackrocks surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Nanakuli Blackrocks sea temperature is
25.6° C
(Which is normal for this time of year)

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 (May 24) at 5AM. The primary swell is predicted to be 0.7m and 13s period. 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 1.0m 19s and forecast to arrive on Friday (May 29) at 5PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.4m 8s period and expected on Saturday (May 23) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Sun 24th May)2.5ft (0.7m) 13s
Best Surf 8AM (Wed 27th May)3ft (0.9m) 15s
Most Powerful 5PM (Fri 29th May)3.5ft (1.0m) 19s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Mostly dry. Warm (max 25°C on Sat afternoon, min 22°C on Sat night). Mainly fresh winds.

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Tue afternoon, min 23°C on Mon night). Mainly fresh winds.

Saturday
23
Sunday
24
Monday
25
Tuesday
26
Wednesday
27
Thursday
28
Fri
29
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
1
0
1
1
1
1
1
1
0
0
0
1
1
1
1
2
1
1
3
3
2
Swell
Height Map
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
16
0.6
S
16
0.7
S
15
0.7
NW
13
0.7
NW
12
0.7
NW
12
0.6
S
14
0.6
S
14
0.5
S
13
0.5
S
13
0.4
S
16
0.5
NW
18
0.7
NW
16
0.8
NW
15
0.8
NW
14
0.8
NW
13
0.8
NW
12
0.9
NW
12
0.6
S
21
0.9
S
20
1
S
19
Wave Graph
Metric surfscale
Energy kJ
188
181
215
183
154
147
142
142
87
84
79
159
254
301
224
205
221
223
329
624
730
Wind (km/h)
35
ENE
40
ENE
35
ENE
30
ENE
30
ENE
35
ENE
25
ENE
25
ENE
30
ENE
25
ENE
30
ENE
30
ENE
30
ENE
30
ENE
25
ENE
25
ENE
30
ENE
30
ENE
25
E
25
E
30
ENE
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
High Tide
9:15PM0.60m
11:31AM0.34m
10:06PM0.53m
12:27PM0.43m
10:55PM0.47m
1:08PM0.51m
11:42PM0.41m
1:43PM0.59m
00:27AM0.36m
2:15PM0.64m
1:11AM0.31m
2:46PM0.68m
1:52AM0.28m
3:18PM0.71m
Low Tide
5:03AM0.11m
3:27PM0.28m
5:32AM0.09m
5:26PM0.31m
5:58AM0.08m
7:02PM0.30m
6:22AM0.07m
8:16PM0.27m
6:45AM0.07m
9:14PM0.24m
7:10AM0.06m
10:02PM0.21m
7:37AM0.05m
part cloud
part cloud
clear
clear
clear
clear
part cloud
clear
clear
part cloud
clear
clear
part cloud
part cloud
clear
part cloud
cloud
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:50
5:50
5:50
5:50
5:50
5:50
5:50
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:06
7:07
7:07
7:07
7:07
7:07
7:08
7:08
Temp °C
23
24
25
23
25
25
23
25
25
24
25
26
24
25
25
23
25
25
24
25
26
19
19
20
20
21
21
20
22
21
21
22
23
22
22
21
20
22
21
22
23
24
Swell 1
Height (m)
Direction
Period (s)
0.6
S
16
0.6
S
16
0.7
S
15
0.7
NW
13
0.7
NW
12
0.7
NW
12
0.6
NNW
11
0.6
S
14
0.5
S
13
0.5
S
13
0.9
NE
8
0.5
NW
18
0.7
NW
16
0.8
NW
15
0.8
NW
14
1.2
ENE
7
0.8
NW
12
0.9
NW
12
0.8
NW
12
0.9
S
20
1
S
19
Energy kJ
188
181
215
183
154
147
84
142
87
84
86
159
254
301
224
164
221
223
175
624
730
Swell 2
Height (m)
Direction
Period (s)
0.4
NNW
11
0.4
NNW
10
0.6
NNW
15
0.6
S
15
0.5
S
13
0.5
S
14
0.6
S
14
0.5
NW
11
0.5
NW
11
0.4
NW
10
0.4
S
13
0.5
S
12
0.6
S
14
0.6
S
14
0.6
S
13
0.8
NW
13
0.6
S
12
0.6
S
12
0.6
S
21
0.7
NW
12
0.7
NW
12
Energy kJ
45
41
146
155
92
93
142
58
56
27
51
73
148
144
127
205
105
103
329
144
140
Swell 3
Height (m)
Direction
Period (s)
0.4
SSW
13
0.4
NNW
16
0.4
NW
10
0.4
NW
10
0.3
S
16
0.3
S
16
0.2
SSE
11
0.2
SSE
9
0.2
SSE
10
0.3
S
17
0.4
S
16
0.3
S
16
0.2
NNW
9
0.3
SE
8
0.4
NW
17
0.6
S
13
0.3
SW
16
0.4
SSE
6
0.5
S
12
0.6
NNE
9
0.6
NNE
9
Energy kJ
59
103
26
24
46
46
11
8
10
49
79
45
8
11
77
121
40
15
67
66
61
Wind waves
Height (m)
Direction
Period (s)
2.1
ENE
8
2.4
ENE
8
2.2
ENE
8
2
ENE
8
1.8
ENE
8
1.9
ENE
8
1.7
ENE
8
1.6
ENE
8
1.7
ENE
7
1.6
ENE
7
1.1
E
7
1.7
E
7
1.5
E
7
1.7
E
7
1.4
ENE
7
1.6
ENE
7
1.4
E
7
1.4
ENE
7
1.3
ENE
7
1.1
E
7
1.2
E
7
Energy kJ
578
744
630
511
404
406
310
273
270
245
107
278
226
295
220
261
209
193
172
131
155
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
3
1
1
2
1
1
1
2
2
2
2
2
2
2
2
3
3
2
Distance (km)
162
169
177
17
159
159
17
7
13
8
8
16
7
10
7
0
10
8
0
0
8
Best forecast wave conditions in Oahu
Rating
(10 max)
3
2
2
2
1
2
2
2
3
3
2
2
2
3
3
3
Best forecast wave conditions in United States
Rating
(10 max)
3
2
2
3
1
1
2
2
2
3
2
2
5
3
3
4
2
2
4
4
3
Header Global
Rating
(10 max)
4
8
5
5
5
5
5
4
4
5
5
7
7
6
9
9
9
9
8
5
6
  • Map Icons:
  • Break
  • 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 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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