Nanakuli Blackrocks surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 1 pm Tuesday 19 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 Wednesday (May 20) at 2AM. The primary swell is predicted to be 0.7m and 15s 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 0.8m 15s and forecast to arrive on Tuesday (May 19) at 8PM. 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 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Wed 20th May)2.5ft (0.7m) 15s
Best Surf 2AM (Wed 20th May)2.5ft (0.7m) 15s
Most Powerful 8PM (Tue 19th May)2.5ft (0.8m) 15s

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 27°C on Tue afternoon, min 22°C on Thu night). Mainly fresh winds.

Days 5-7 Weather Summary

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

Tue
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
Sunday
24
Monday
25
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
Rating
(10 max)
1
2
1
1
1
0
0
0
0
1
1
1
1
1
1
1
1
1
0
0
0
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)
0.8
SSW
15
0.7
SSW
15
0.6
SSW
14
0.6
SSW
14
0.4
SSW
17
0.5
S
16
0.5
S
16
0.6
S
15
0.5
S
14
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
NW
12
0.6
S
14
0.6
S
14
0.5
S
13
0.6
S
13
0.4
S
16
Wave Graph
Metric surfscale
Energy kJ
246
222
163
149
102
134
126
157
107
97
188
181
215
183
154
116
142
142
87
121
79
Wind (km/h)
25
ENE
25
ENE
30
ENE
30
ENE
35
ENE
35
ENE
35
ENE
30
ENE
30
ENE
35
ENE
30
ENE
35
ENE
35
ENE
30
ENE
35
E
30
ENE
30
ENE
30
ENE
30
ENE
25
ENE
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
6:35PM0.78m
6:18AM0.19m
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
Low Tide
2:45AM0.14m
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
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
part cloud
clear
part cloud
clear
<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
7:05
7:06
7:06
7:07
7:07
7:07
7:07
Temp °C
27
24
25
25
23
24
25
23
25
25
23
25
25
23
25
25
23
25
25
23
25
26
23
23
22
20
20
21
19
21
21
19
21
21
19
21
20
20
21
21
20
22
Swell 1
Height (m)
Direction
Period (s)
1
E
8
0.7
SSW
15
0.6
SSW
14
0.6
SSW
14
0.5
SSW
13
0.5
S
16
0.5
S
16
0.6
S
15
0.6
N
7
0.5
S
14
1.9
ENE
8
0.6
S
16
0.7
S
15
0.7
NW
13
0.7
NW
12
0.6
NW
12
0.6
NNW
11
0.6
S
14
0.5
S
13
0.6
S
13
1.5
ENE
7
Energy kJ
131
222
163
149
102
134
126
157
33
93
460
181
215
183
154
116
84
142
87
121
228
Swell 2
Height (m)
Direction
Period (s)
0.8
SSW
15
0.6
NNW
11
0.6
NNW
10
0.5
NNW
11
0.4
NNW
10
0.4
SSW
13
0.4
SE
13
0.4
SE
13
0.5
S
14
0.4
S
18
0.6
S
16
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
0.4
NW
11
0.4
NW
10
0.4
S
16
Energy kJ
246
75
69
64
39
60
44
40
107
97
188
40
146
155
92
93
142
58
40
26
79
Swell 3
Height (m)
Direction
Period (s)
0.5
NW
10
0.4
SSE
9
0.3
SSW
18
0.3
S
18
0.4
SSW
17
0.4
NW
10
0.3
NNW
10
0.3
NNW
10
0.4
NW
10
0.4
NNW
11
0.4
NNW
11
0.4
NW
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
0.4
SE
6
0.2
SSE
6
0.4
S
12
Energy kJ
54
33
63
56
92
24
18
19
27
46
45
67
26
24
46
46
11
9
10
4
47
Wind waves
Height (m)
Direction
Period (s)
1.3
ENE
8
1.8
E
7
1.8
E
8
2.1
E
8
2.3
E
8
2.4
E
8
2.2
E
9
1.9
E
8
2
ENE
8
2.1
ENE
8
2.1
ENE
8
2
ENE
8
1.8
ENE
8
1.6
ENE
8
1.9
E
8
1.6
E
8
1.7
ENE
8
1.5
ENE
8
Energy kJ
223
324
408
597
703
809
715
517
521
547
534
497
406
333
408
292
331
256
Nearest Offshore or Glassy
Rating
(10 max)
2
2
1
2
1
1
3
1
1
3
2
1
1
3
1
1
1
2
2
1
1
Distance (km)
7
0
8
15
159
161
177
13
159
169
13
159
162
17
162
10
7
17
17
1
15
Best forecast wave conditions in Oahu
Rating
(10 max)
2
2
2
2
2
2
3
2
2
2
2
2
1
Best forecast wave conditions in United States
Rating
(10 max)
4
4
4
3
3
3
3
3
1
3
2
1
2
3
3
2
3
2
2
3
1
Header Global
Rating
(10 max)
5
4
4
4
5
4
5
7
7
5
6
9
6
5
5
5
5
4
4
4
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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