Nanakuli Blackrocks surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 7 am Wednesday 20 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
25.8° C
(Which is slightly warmer than usual)

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 Monday (May 25) at 5AM. The primary swell is predicted to be 0.6m and 14s period with a secondary swell of 0.6m and 11s. 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 0.7m 16s and forecast to arrive on Saturday (May 23) 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 2.5m 8s period and expected on Thursday (May 21) at 11AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Mon 25th May)2ft (0.6m) 14s
Best Surf 5AM (Mon 25th May)2ft (0.6m) 14s
Most Powerful 2PM (Sat 23rd May)2.5ft (0.7m) 16s

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 Wed morning, min 23°C on Wed night). Mainly fresh winds.

Days 4-6 Weather Summary

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

Wednesday
20
Thursday
21
Friday
22
Saturday
23
Sunday
24
Monday
25
Tuesday
26
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
1
1
0
0
1
0
1
0
0
1
1
1
1
1
0
1
0
0
0
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
SSW
14
0.6
SSW
14
0.5
S
16
0.5
S
16
0.5
S
16
0.6
S
15
0.4
S
18
0.4
S
18
0.6
S
16
0.6
S
16
0.7
S
15
0.7
NW
13
0.7
NW
12
0.6
S
14
0.6
S
14
0.6
S
14
0.6
S
13
0.5
S
13
0.5
S
13
0.4
S
16
0.6
S
15
Wave Graph
Metric surfscale
Energy kJ
163
149
137
134
126
157
107
97
188
181
215
183
154
132
142
142
125
84
80
80
150
Wind (km/h)
30
ENE
30
ENE
35
ENE
35
ENE
35
ENE
30
ENE
35
ENE
35
ENE
25
ENE
35
ENE
35
ENE
25
ENE
30
ENE
30
ENE
25
ENE
30
ENE
30
ENE
25
ENE
30
ENE
30
ENE
25
ENE
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
High Tide
7:28PM0.72m
8:01AM0.20m
8:22PM0.66m
10:01AM0.25m
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
Low Tide
11:14AM0.07m
3:42AM0.13m
12:10PM0.14m
4:27AM0.12m
1:30PM0.22m
5:03AM0.11m
3:27PM0.28m
5:32AM0.09m
5:26PM0.31m
5:58AM0.08m
7:02PM0.30m
6:22AM0.07m
8:16PM0.27m
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:52
5:52
5:50
5:50
5:50
5:50
5:50
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:05
7:06
7:06
7:07
7:07
7:07
7:07
Temp °C
25
25
23
24
25
23
24
25
23
24
24
23
25
25
23
25
25
24
25
25
24
23
22
20
20
20
19
20
21
19
19
19
20
21
21
20
22
22
22
22
21
22
Swell 1
Height (m)
Direction
Period (s)
0.6
SSW
14
0.6
SSW
14
0.4
NNW
10
0.5
S
16
0.5
S
16
0.6
S
15
0.5
S
14
0.5
S
14
0.6
S
16
0.6
S
16
0.7
S
15
0.7
NW
13
0.7
NW
12
0.6
NW
12
0.6
S
14
0.6
S
14
0.6
S
13
0.5
S
13
0.9
ENE
8
0.5
S
12
0.6
S
15
Energy kJ
163
149
39
134
126
157
107
93
188
181
215
183
154
116
142
142
125
84
99
73
150
Swell 2
Height (m)
Direction
Period (s)
0.6
NNW
10
0.5
NNW
11
0.5
S
16
0.4
SSW
13
0.4
SE
13
0.4
SE
13
0.4
NW
10
0.4
S
18
0.4
NNW
11
0.4
NNW
10
0.6
NNW
15
0.6
S
15
0.6
S
13
0.6
S
14
0.6
NNW
11
0.5
NW
11
0.5
NW
11
0.4
NW
10
0.5
S
13
0.4
SE
6
0.3
NW
14
Energy kJ
69
64
137
60
44
40
27
97
45
40
146
155
130
132
84
58
56
27
80
10
31
Swell 3
Height (m)
Direction
Period (s)
0.3
SSW
18
0.3
S
18
0.4
SSW
13
0.4
NW
10
0.3
NNW
10
0.3
NNW
10
0.4
S
18
0.4
NNW
11
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
9
0.2
SSE
9
0.1
SE
10
0.3
SSE
6
0.4
N
6
0.4
S
16
0.2
NNW
9
Energy kJ
63
56
67
24
19
19
101
46
59
103
26
24
46
46
8
8
4
7
12
80
8
Wind waves
Height (m)
Direction
Period (s)
1.6
E
8
1.6
E
8
2.1
E
8
2.5
E
8
2.5
E
8
2.2
E
9
2.1
ENE
9
2
ENE
8
2
ENE
8
2
ENE
8
2.3
ENE
8
2
ENE
8
1.9
ENE
8
1.9
ENE
8
1.7
E
8
1.6
ENE
7
1.8
ENE
6
1.3
ENE
7
1.4
ENE
5
1.4
ENE
7
Energy kJ
334
341
597
809
935
732
616
562
511
527
655
523
395
450
329
259
229
193
102
203
Nearest Offshore or Glassy
Rating
(10 max)
2
2
1
1
1
1
3
3
1
1
1
3
3
2
1
1
1
1
1
1
1
Distance (km)
10
15
159
162
161
159
169
169
10
161
177
8
171
17
7
7
15
0
13
17
8
Best forecast wave conditions in Oahu
Rating
(10 max)
2
2
2
3
2
2
2
2
1
1
1
1
Best forecast wave conditions in United States
Rating
(10 max)
4
2
3
3
2
3
3
3
2
1
2
3
3
2
3
2
2
4
1
1
4
Header Global
Rating
(10 max)
4
5
5
5
7
6
5
5
9
6
5
5
4
4
4
5
4
4
4
4
5
  • 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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