Nanakuli Blackrocks surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 1 am Friday 15 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
25.4° 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 Friday (May 15) at 11AM. The primary swell is predicted to be 1.1m and 12s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Nanakuli Blackrocks in the next 16 days are 0.9m 18s and forecast to arrive on Tuesday (May 19) at 5AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 8s period and expected on Wednesday (May 20) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)11AM (Fri 15th May)3.5ft (1.1m) 12s
Best Surf11AM (Fri 15th May)3.5ft (1.1m) 12s
Most Powerful 5AM (Tue 19th May)3ft (0.9m) 18s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Moderate rain (total 13mm), heaviest on Fri afternoon. Warm (max 26°C on Sat afternoon, min 23°C on Fri afternoon). Wind will be generally light.

Days 4-6 Weather Summary

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

Friday
15
Saturday
16
Sunday
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
0
1
2
2
2
1
2
2
2
2
1
1
1
1
1
1
1
1
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.1
NW
12
0.9
NW
12
0.7
NW
11
0.6
SSW
15
0.6
SSW
14
0.6
SSW
15
0.7
SSE
11
0.8
SSW
15
0.8
SSW
14
0.8
SSW
14
0.8
SSW
14
0.7
SSW
14
0.6
SSW
18
0.8
SSW
15
0.8
SSW
15
0.6
SSW
14
0.6
SSW
14
0.5
S
16
0.5
S
16
0.5
S
16
0.6
S
15
Wave Graph
Metric surfscale
Energy kJ
353
209
128
152
140
148
103
249
236
233
213
161
207
249
252
163
149
137
134
126
157
Wind (km/h)
5
NW
15
WSW
10
ENE
5
SE
5
E
5
ESE
5
ENE
10
E
15
ENE
15
E
25
ENE
20
ENE
25
ENE
25
ENE
25
ENE
25
ENE
30
ENE
30
ENE
30
ENE
35
ENE
25
ENE
glassy
on
off
cross-off
off
cross-off
off
cross-off
off
off
off
off
off
off
off
off
off
off
off
off
off
High Tide
3:24PM0.78m
2:40AM0.29m
4:08PM0.82m
3:24AM0.25m
4:54PM0.83m
4:11AM0.22m
5:43PM0.81m
5:06AM0.20m
6:35PM0.78m
6:18AM0.19m
7:28PM0.72m
8:01AM0.20m
8:22PM0.66m
Low Tide
10:33PM0.17m
8:28AM-0.03m
11:34PM0.15m
9:05AM-0.03m
00:36AM0.15m
9:45AM-0.02m
1:40AM0.14m
10:27AM0.02m
2:45AM0.14m
11:14AM0.07m
3:42AM0.13m
12:10PM0.14m
4:27AM0.12m
thunderstorm
thunderstorm
thunderstorm
clear
thunderstorm
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:54
5:52
5:52
5:52
5:52
5:52
5:52
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:02
7:04
7:04
7:04
7:05
7:05
7:06
2
8
1
2
Temp °C
25
25
24
25
26
25
26
26
25
26
26
24
24
25
24
25
26
24
25
26
24
28
26
26
28
29
27
29
29
25
27
26
23
23
23
23
23
24
22
22
23
21
Swell 1
Height (m)
Direction
Period (s)
1.2
E
8
1
E
8
1
E
8
1
E
8
1.1
ENE
8
1
ENE
8
0.9
ENE
8
0.9
ENE
8
1
E
8
1
E
8
1
E
8
1.2
E
8
0.7
SSW
14
0.8
SSW
15
0.8
SSW
15
0.6
SSW
14
0.6
SSW
14
0.4
NNW
10
0.5
S
16
0.5
S
16
0.6
S
15
Energy kJ
164
120
127
134
171
144
112
115
144
140
133
186
178
249
252
163
149
38
134
126
157
Swell 2
Height (m)
Direction
Period (s)
1.1
NW
12
0.9
NW
12
0.7
NW
11
0.6
NW
11
0.6
NNW
11
0.6
NNW
10
0.7
SSE
7
0.8
SSW
15
0.8
SSW
14
0.8
SSW
14
0.8
SSW
14
0.7
SSW
14
0.6
SSW
18
0.6
NNW
12
0.7
NNW
11
0.6
NNW
10
0.5
NNW
10
0.5
S
16
0.4
SSW
14
0.4
NNW
10
0.4
SSE
13
Energy kJ
353
209
128
96
78
69
47
249
236
233
213
161
207
91
103
69
59
137
73
38
63
Swell 3
Height (m)
Direction
Period (s)
0.6
SSW
16
0.6
SSW
16
0.5
N
6
0.6
SSW
15
0.6
SSW
14
0.6
SSW
15
0.7
SSE
11
0.7
SSE
7
0.5
SSE
7
0.7
SSE
10
0.5
SSE
7
0.4
SSE
7
0.6
NNW
12
0.4
SE
7
0.4
SSE
9
0.3
SSW
18
0.4
SE
7
0.4
SSW
13
0.4
NNW
10
0.4
SE
13
0.2
NNW
9
Energy kJ
169
169
22
152
140
148
103
46
27
86
27
18
91
13
32
63
12
68
37
44
8
Wind waves
Height (m)
Direction
Period (s)
1
ENE
8
1.1
ENE
8
1
ENE
8
1.2
ENE
8
1.2
E
8
1.3
ENE
8
1.5
E
7
1.5
E
8
1.6
ENE
8
2
E
8
1.7
E
8
2
E
8
1.8
E
8
Energy kJ
128
157
125
197
186
218
246
259
295
526
383
459
428
Nearest Offshore or Glassy
Rating
(10 max)
3
2
1
2
2
2
1
2
2
2
2
1
2
2
2
2
1
2
1
3
1
Distance (km)
0
12
0
0
0
0
0
0
0
0
0
0
7
7
7
7
159
17
7
169
8
Best forecast wave conditions in Oahu
Rating
(10 max)
3
2
2
2
3
2
2
2
2
2
2
2
2
2
2
2
2
2
1
Best forecast wave conditions in United States
Rating
(10 max)
4
2
2
4
4
3
2
4
5
4
3
4
4
3
4
3
3
3
3
3
3
Header Global
Rating
(10 max)
6
5
4
6
4
5
7
4
6
4
4
4
4
4
4
6
5
4
7
5
5
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
submit an eyeball surf report

Quick surf report for Nanakuli Blackrocks:

join our community of surf reporters

FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Nanakuli Blackrocks surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


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.

Nearest locationNearest
Nearest locationNearest
Nearest locationNearest