Nanakuli Blackrocks surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 1 pm Thursday 21 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 Wednesday (May 27) at 11PM. The primary swell is predicted to be 0.8m and 13s period with a secondary swell of 0.6m and 13s. 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 0.9m 14s and forecast to arrive on Wednesday (May 27) 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 2.3m 8s period and expected on Thursday (May 21) at 5PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)11PM (Wed 27th May)2.5ft (0.8m) 13s
Best Surf 8PM (Thu 28th May)1.5ft (0.5m) 23s
Most Powerful 2PM (Wed 27th May)3ft (0.9m) 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 25°C on Thu afternoon, min 22°C on Sat night). Mainly fresh winds.

Days 5-7 Weather Summary

Mostly dry. Warm (max 25°C on Sun afternoon, min 23°C on Sun night). Mainly fresh winds.

Thu
21
Friday
22
Saturday
23
Sunday
24
Monday
25
Tuesday
26
Wednesday
27
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
Rating
(10 max)
0
0
1
0
1
0
1
1
1
1
1
1
0
0
0
1
1
1
1
2
2
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
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
0.7
NW
12
0.6
S
14
0.6
S
14
0.5
S
13
0.5
S
13
0.4
S
16
0.4
NW
18
0.7
NW
16
0.8
NW
15
0.9
NW
14
0.8
NW
13
0.8
NW
12
Wave Graph
Metric surfscale
Energy kJ
126
157
107
97
188
181
215
183
154
147
142
142
87
84
79
118
257
301
327
246
181
Wind (km/h)
40
ENE
30
ENE
35
ENE
35
ENE
30
ENE
35
ENE
30
ENE
30
ENE
35
ENE
30
ENE
30
ENE
30
ENE
30
ENE
25
ENE
30
ENE
30
ENE
30
ENE
25
ENE
30
ENE
20
ENE
25
E
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
High Tide
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
2:15PM0.64m
1:11AM0.31m
Low Tide
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
6:45AM0.07m
9:14PM0.24m
7:10AM0.06m
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
part cloud
clear
clear
part cloud
clear
<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>
7:06
7:06
7:07
7:07
7:07
7:07
7:07
7:08
Temp °C
25
23
24
25
23
23
24
23
25
25
23
24
25
23
25
25
24
25
26
24
25
20
19
20
20
19
19
19
20
21
20
20
20
21
20
21
21
22
23
23
22
23
Swell 1
Height (m)
Direction
Period (s)
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
0.7
NW
12
0.6
S
14
0.6
S
14
0.5
S
13
0.5
S
13
0.4
S
13
0.4
NW
18
0.7
NW
16
1.4
E
7
0.9
NW
14
0.8
NW
13
0.8
NW
12
Energy kJ
126
157
107
93
188
181
215
183
154
147
142
142
87
84
51
118
257
203
327
246
181
Swell 2
Height (m)
Direction
Period (s)
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
0.5
S
14
0.5
S
14
0.6
NNW
11
0.5
NW
11
0.5
NW
11
0.4
NW
10
0.4
S
16
0.4
S
12
0.6
S
14
0.8
NW
15
0.6
S
13
0.6
S
13
0.6
S
12
Energy kJ
44
40
27
97
45
41
146
155
93
93
84
58
56
27
79
47
148
301
127
119
105
Swell 3
Height (m)
Direction
Period (s)
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
11
0.2
SSE
9
0.2
SSE
10
0.2
S
17
0.4
SE
9
0.3
S
16
0.4
SE
8
0.6
S
14
0.4
SE
8
0.2
SSW
16
0.4
SSE
7
Energy kJ
18
19
101
46
59
103
26
24
46
46
11
8
9
22
20
45
18
142
18
25
18
Wind waves
Height (m)
Direction
Period (s)
2.3
E
8
2.2
E
9
1.9
ENE
8
2.1
ENE
8
2.1
ENE
8
2
ENE
8
2.2
ENE
8
1.7
ENE
8
2
ENE
8
2
ENE
8
1.9
ENE
8
1.6
ENE
8
2
ENE
7
1.6
ENE
7
1.6
ENE
7
1.6
ENE
7
1.6
ENE
7
1.4
ENE
7
1.4
E
7
1.2
ENE
7
Energy kJ
736
732
534
578
560
497
612
385
502
426
385
300
349
252
247
247
254
208
209
164
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
3
3
1
1
1
1
1
1
1
1
1
1
2
1
2
2
2
2
Distance (km)
161
162
159
169
169
159
162
162
7
10
159
10
162
159
13
171
159
0
7
8
0
Best forecast wave conditions in Oahu
Rating
(10 max)
2
2
2
2
3
3
2
2
Best forecast wave conditions in United States
Rating
(10 max)
4
2
2
3
3
2
3
2
2
2
1
3
2
1
3
9
2
4
3
2
4
Header Global
Rating
(10 max)
5
7
6
5
6
8
5
5
6
5
5
4
4
5
5
5
5
5
9
8
9
  • Map Icons:
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  • 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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