Nanakuli Blackrocks surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 7 pm Monday 25 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
25.3° 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 Wednesday (May 27) at 2AM. The primary swell is predicted to be 0.7m and 16s 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 2PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 7s period and expected on Tuesday (May 26) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Wed 27th May)2.5ft (0.7m) 16s
Best Surf 5AM (Wed 27th May)3ft (0.9m) 15s
Most Powerful 2PM (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 26°C on Thu afternoon, min 23°C on Mon night). Mainly fresh winds.

Days 5-7 Weather Summary

Mostly dry. Warm (max 26°C on Fri afternoon, min 23°C on Thu night). Wind will be generally light.

Tuesday
26
Wednesday
27
Thursday
28
Friday
29
Saturday
30
Sunday
31
Mon
1
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
0
0
1
2
2
1
2
2
1
3
3
3
3
3
2
2
2
2
3
3
3
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)
0.5
S
13
0.4
S
16
0.6
NW
18
0.7
NW
16
0.9
NW
14
0.9
NW
14
0.8
NW
13
0.8
NW
12
0.8
NW
12
0.7
S
21
0.9
S
20
1
S
19
1
S
18
1
S
17
0.9
SSW
16
0.9
SSW
16
0.9
SSW
15
0.8
SSW
14
0.7
S
19
0.9
S
18
1
S
18
Wave Graph
Metric surfscale
Energy kJ
84
79
201
251
341
313
242
175
175
445
618
730
627
589
437
416
370
280
365
515
632
Wind (km/h)
30
ENE
25
ENE
30
ENE
25
ENE
25
ENE
30
ENE
20
ENE
25
ENE
25
ENE
15
ENE
25
ENE
25
ENE
15
ENE
15
ENE
25
NE
10
ENE
5
E
10
E
15
ENE
5
ESE
10
ESE
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
glassy
cross-off
High Tide
11:42PM0.41m
1:43PM0.59m
00:27AM0.36m
2:15PM0.64m
1:11AM0.31m
2:46PM0.68m
1:52AM0.28m
3:18PM0.71m
2:31AM0.26m
3:51PM0.72m
3:07AM0.24m
4:26PM0.72m
3:42AM0.23m
5:03PM0.71m
Low Tide
6:22AM0.07m
8:16PM0.27m
6:45AM0.07m
9:14PM0.24m
7:10AM0.06m
10:02PM0.21m
7:37AM0.05m
10:44PM0.19m
8:06AM0.05m
11:25PM0.17m
8:36AM0.04m
00:07AM0.17m
9:08AM0.05m
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
part cloud
<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>
7:07
7:07
7:07
7:08
7:08
7:09
7:09
7:09
Temp °C
23
25
25
23
24
25
23
25
26
24
25
26
24
25
26
24
26
26
25
26
26
21
23
22
20
22
22
21
23
24
23
23
24
22
24
25
23
28
28
27
29
28
Swell 1
Height (m)
Direction
Period (s)
0.5
S
13
0.4
S
13
0.6
NW
18
1.5
E
7
1.3
ENE
7
0.9
NW
14
0.8
NW
13
1.1
ENE
7
0.8
NW
12
0.7
NW
12
1
E
7
1
S
19
1
S
18
1
S
17
0.9
SSW
16
0.9
SSW
16
0.9
SSW
15
0.8
SSW
14
0.9
SSW
14
0.9
S
18
1
E
7
Energy kJ
84
51
201
239
167
313
242
128
175
137
93
730
627
589
437
416
370
280
346
515
106
Swell 2
Height (m)
Direction
Period (s)
0.4
NW
10
0.4
S
16
0.5
S
12
0.7
NW
16
0.9
NW
14
0.6
S
14
0.6
S
13
0.8
NW
12
0.6
S
12
0.7
S
21
0.9
S
20
0.6
NNW
11
0.6
S
13
0.9
E
7
0.8
E
8
0.6
N
8
0.9
E
8
0.8
E
8
0.8
E
8
0.7
S
14
1
S
18
Energy kJ
27
79
73
251
341
129
121
175
103
445
618
84
114
88
72
50
93
76
74
195
632
Swell 3
Height (m)
Direction
Period (s)
0.3
S
17
0.3
NW
10
0.4
SE
8
0.6
S
15
0.6
S
14
0.3
SSE
6
0.3
N
11
0.6
S
12
0.4
S
23
0.5
N
11
0.7
NW
12
0.5
N
10
0.6
NNW
11
0.6
NNW
10
0.8
N
10
0.4
NNW
10
0.5
N
8
0.5
N
8
0.7
S
19
0.7
N
10
0.7
N
10
Energy kJ
49
15
18
150
144
7
23
105
167
57
135
47
78
77
120
38
33
30
365
96
90
Wind waves
Height (m)
Direction
Period (s)
1.7
ENE
7
1.4
ENE
7
1.7
ENE
7
1.4
ENE
7
1.4
E
7
1.1
NE
7
1.3
ENE
7
1.1
E
7
1.1
E
7
1.1
E
7
1.1
E
7
1
ENE
8
0.9
E
8
0.9
ENE
5
0.9
E
8
Energy kJ
293
208
268
193
192
119
158
111
120
127
113
120
90
32
90
Nearest Offshore or Glassy
Rating
(10 max)
1
2
1
1
2
2
2
2
2
2
3
1
3
3
3
3
2
2
2
3
3
Distance (km)
159
17
7
159
7
0
7
0
0
10
0
7
0
0
0
0
0
0
0
0
0
Best forecast wave conditions in Oahu
Rating
(10 max)
2
2
2
3
3
2
2
2
3
3
3
3
3
3
3
2
2
3
3
Best forecast wave conditions in United States
Rating
(10 max)
1
3
2
1
3
4
3
4
2
2
4
4
4
4
3
3
4
2
3
4
3
Header Global
Rating
(10 max)
4
9
9
7
6
6
9
9
9
9
5
5
5
4
7
7
7
5
4
4
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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