Nanakuli Blackrocks surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 1 am Tuesday 12 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 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 Thursday (May 14) at 2AM. The primary swell is predicted to be 0.6m 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 1.2m 14s and forecast to arrive on Thursday (May 14) 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 1.8m 7s period and expected on Wednesday (May 13) at 5AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Thu 14th May)2ft (0.6m) 16s
Best Surf 2PM (Thu 14th May)3.5ft (1.1m) 15s
Most Powerful 5PM (Thu 14th May)4ft (1.2m) 14s

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 Tue afternoon, min 23°C on Tue night). Mainly fresh winds.

Days 4-6 Weather Summary

Light rain (total 8mm), mostly falling on Fri night. Warm (max 26°C on Fri morning, min 24°C on Fri morning). Wind will be generally light.

Tuesday
12
Wednesday
13
Thursday
14
Friday
15
Saturday
16
Sunday
17
Monday
18
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
0
0
2
2
2
3
2
1
2
1
1
2
1
2
2
2
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.5
SSW
16
1
NNW
10
0.9
NNW
10
0.5
S
14
0.4
SSW
14
0.6
NW
16
1
NW
15
1.2
NW
14
1.2
NW
13
1
NW
12
0.9
NW
12
0.7
SSE
11
0.5
SW
15
0.6
NNW
11
0.6
SSW
15
0.6
SSW
14
0.8
SSW
15
0.7
SSW
14
0.7
SSW
14
0.7
SSW
14
0.7
SSW
14
Wave Graph
Metric surfscale
Energy kJ
144
214
135
103
82
216
435
606
517
301
209
101
104
79
144
138
249
183
180
212
161
Wind (km/h)
25
E
30
ENE
25
ENE
30
ENE
30
ENE
25
ENE
20
ENE
25
ENE
15
E
15
E
20
E
10
NE
15
E
20
E
10
E
5
S
10
E
20
ENE
25
ENE
30
ENE
25
ENE
off
off
off
off
off
off
off
off
off
off
cross-off
off
off
off
cross-off
glassy
off
off
off
off
off
High Tide
1:29PM0.52m
00:28AM0.44m
2:05PM0.62m
1:12AM0.39m
2:43PM0.71m
1:56AM0.34m
3:24PM0.78m
2:40AM0.29m
4:08PM0.82m
3:24AM0.25m
4:54PM0.83m
4:11AM0.22m
5:43PM0.81m
Low Tide
7:21PM0.26m
6:58AM0.04m
8:30PM0.23m
7:24AM0.01m
9:33PM0.20m
7:55AM-0.01m
10:33PM0.17m
8:28AM-0.03m
11:34PM0.15m
9:05AM-0.03m
00:36AM0.15m
9:45AM-0.02m
1:40AM0.14m
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
thunderstorm
thunderstorm
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:54
5:54
5:54
5:54
5:52
5:52
5:52
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:01
7:01
7:02
7:02
7:04
7:04
7:04
2
6
Temp °C
25
26
23
25
26
24
25
26
24
26
26
24
26
26
25
26
26
25
26
26
24
22
22
20
22
23
22
23
24
23
26
25
24
27
26
26
30
29
24
25
23
23
Swell 1
Height (m)
Direction
Period (s)
0.7
NNW
11
1
NNW
10
0.9
NNW
10
0.7
NNW
9
0.6
NNW
9
1.5
E
8
1.3
E
7
1.2
NW
14
1.2
NW
13
1.1
E
8
1.1
E
8
1.1
E
8
1.1
ENE
8
1.1
E
8
1.1
E
8
1
ENE
8
1
ENE
8
0.7
SSW
14
1.1
E
8
0.7
SSW
14
1.3
E
8
Energy kJ
123
214
135
73
64
253
183
606
517
153
153
157
171
165
169
147
151
183
165
166
191
Swell 2
Height (m)
Direction
Period (s)
0.7
N
6
0.5
S
16
0.4
SSE
15
0.5
S
14
0.5
SE
9
0.7
N
8
1
NW
15
0.6
N
8
1.1
E
8
1
NW
12
0.9
NW
12
0.6
NW
11
0.6
NNW
11
0.6
SSE
10
0.6
SSW
15
0.7
SSE
7
0.8
SSW
15
0.5
SSE
7
0.7
SSW
14
0.5
SSW
19
0.7
SSW
14
Energy kJ
40
124
73
103
41
66
435
49
138
301
209
101
79
65
144
48
249
26
180
212
161
Swell 3
Height (m)
Direction
Period (s)
0.5
SSW
16
0.4
SE
9
0.4
SW
16
0.4
SE
9
0.4
SSW
14
0.6
NW
16
0.6
N
8
0.5
SE
10
0.5
SW
16
0.5
SSE
11
0.6
SSW
16
0.7
SSE
11
0.5
SW
15
0.6
NNW
11
0.5
NNW
10
0.6
SSW
14
0.7
SSE
7
0.4
SSE
10
0.7
SSE
10
0.4
SSE
7
0.5
NW
12
Energy kJ
144
28
65
28
82
216
49
45
132
68
169
101
104
79
60
138
42
40
88
20
77
Wind waves
Height (m)
Direction
Period (s)
1.2
E
7
1.3
E
6
1.7
E
7
1.6
E
7
1.7
E
7
1.2
E
8
1.2
E
8
1.3
ENE
8
Energy kJ
128
128
262
246
255
169
205
235
Nearest Offshore or Glassy
Rating
(10 max)
2
1
1
1
1
2
2
3
3
2
2
2
1
1
2
1
2
2
2
2
2
Distance (km)
7
10
7
7
13
0
0
7
0
0
13
0
0
0
0
0
0
0
0
10
7
Best forecast wave conditions in Oahu
Rating
(10 max)
2
1
1
1
1
2
3
3
3
3
2
2
2
2
2
2
2
2
2
2
2
Best forecast wave conditions in United States
Rating
(10 max)
2
1
2
1
2
4
3
3
3
3
2
4
4
2
5
4
4
7
5
4
4
Header Global
Rating
(10 max)
9
9
6
8
9
5
5
5
5
5
5
4
6
5
5
4
4
7
5
5
4
  • 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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