Nanakuli Blackrocks surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 7 am Monday 25 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 Wednesday (May 27) at 5AM. The primary swell is predicted to be 0.9m and 15s 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 1.0m 19s and forecast to arrive on Friday (May 29) 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 1.9m 7s period and expected on Tuesday (May 26) at 2AM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Wed 27th May)3ft (0.9m) 15s
Best Surf 5AM (Wed 27th May)3ft (0.9m) 15s
Most Powerful 2PM (Fri 29th May)3.5ft (1.0m) 19s

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

Days 4-6 Weather Summary

Mostly dry. Warm (max 26°C on Fri afternoon, min 22°C on Thu night). Wind will be generally light.

Monday
25
Tuesday
26
Wednesday
27
Thursday
28
Friday
29
Saturday
30
Sunday
31
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
0
0
0
1
1
3
1
2
2
1
3
3
2
3
3
3
2
2
2
3
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
S
14
0.6
S
13
0.5
S
13
0.4
S
16
0.6
NW
18
0.7
NW
16
0.9
NW
14
0.9
NW
14
0.8
NW
13
0.8
NW
12
0.8
NW
12
0.7
S
21
0.9
S
20
1
S
19
1
S
18
1
S
17
0.9
S
16
0.9
SSW
16
0.8
SSW
15
0.8
SSW
14
0.7
S
19
Wave Graph
Metric surfscale
Energy kJ
142
125
84
79
201
251
341
313
242
175
175
445
618
730
627
589
422
416
296
280
365
Wind (km/h)
30
ENE
30
ENE
25
ENE
25
ENE
30
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
25
ENE
20
ENE
25
ENE
25
ENE
20
ENE
15
ENE
15
ENE
15
ENE
10
ENE
15
ENE
15
ENE
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
High Tide
1:08PM0.51m
11:42PM0.41m
1:43PM0.59m
00:27AM0.36m
2:15PM0.64m
1:11AM0.31m
2:46PM0.68m
1:52AM0.28m
3:18PM0.71m
2:31AM0.26m
3:51PM0.72m
3:07AM0.24m
4:26PM0.72m
3:42AM0.23m
Low Tide
7:02PM0.30m
6:22AM0.07m
8:16PM0.27m
6:45AM0.07m
9:14PM0.24m
7:10AM0.06m
10:02PM0.21m
7:37AM0.05m
10:44PM0.19m
8:06AM0.05m
11:25PM0.17m
8:36AM0.04m
00:07AM0.17m
clear
clear
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
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>
7:07
7:07
7:07
7:08
7:08
7:09
7:09
Temp °C
24
25
23
25
25
23
25
25
23
24
25
24
25
26
24
25
26
24
25
26
24
21
21
21
22
22
20
23
21
21
22
23
23
23
23
22
24
24
23
26
26
23
Swell 1
Height (m)
Direction
Period (s)
0.7
NNE
8
0.6
S
13
0.5
S
13
0.4
S
13
0.6
NW
18
0.7
NW
16
0.9
NW
14
0.9
NW
14
0.8
NW
13
1.1
ENE
7
0.8
NW
12
0.7
NW
12
1
E
7
1
S
19
1
S
18
1.1
E
7
0.9
S
16
0.9
SSW
16
0.8
SSW
15
0.8
SSW
14
0.9
S
14
Energy kJ
72
125
84
51
201
251
341
313
242
132
175
137
93
730
627
124
422
416
296
280
333
Swell 2
Height (m)
Direction
Period (s)
0.6
S
14
0.5
NW
11
0.4
NW
10
0.4
S
16
0.5
S
12
0.6
S
15
0.6
S
14
0.6
S
14
0.6
S
13
0.8
NW
12
0.6
S
12
0.7
S
21
0.9
S
20
0.6
NNW
11
0.6
S
13
1
S
17
0.9
E
7
0.9
E
7
0.8
E
7
0.7
E
8
0.7
S
19
Energy kJ
142
56
27
79
73
150
144
129
121
175
103
445
618
84
114
589
88
88
70
55
365
Swell 3
Height (m)
Direction
Period (s)
0.5
NW
11
0.2
SSE
10
0.3
S
17
0.3
NW
10
0.3
S
16
0.3
SE
9
0.4
SSE
6
0.4
SE
6
0.3
N
11
0.6
S
12
0.4
S
23
0.6
N
11
0.7
NW
12
0.5
N
10
0.6
NNW
11
0.6
NNW
10
0.8
NNW
10
0.6
N
9
0.6
N
8
0.5
N
8
0.6
E
8
Energy kJ
58
9
49
15
45
12
15
9
23
105
167
82
135
47
78
77
125
53
47
34
41
Wind waves
Height (m)
Direction
Period (s)
1.3
E
7
1.6
ENE
7
1.9
ENE
7
1.5
ENE
7
1.8
ENE
7
1.6
E
7
1.2
ENE
7
1.3
ENE
7
1.3
ENE
7
1.4
ENE
7
1.1
E
7
1.3
E
6
1.1
ENE
6
1.1
ENE
7
0.8
ENE
6
0.7
E
7
0.6
ENE
4
Energy kJ
178
254
352
215
299
272
160
181
186
183
117
118
101
132
45
54
16
Nearest Offshore or Glassy
Rating
(10 max)
1
1
2
1
2
2
3
2
2
2
2
3
3
1
3
3
3
2
2
2
3
Distance (km)
161
13
8
7
17
7
0
7
0
0
7
0
0
7
0
0
0
0
0
0
0
Best forecast wave conditions in Oahu
Rating
(10 max)
2
2
2
2
2
3
3
2
2
2
3
3
3
3
3
3
2
2
2
3
Best forecast wave conditions in United States
Rating
(10 max)
1
2
3
2
2
2
5
3
4
2
2
4
4
3
4
3
3
4
3
3
4
Header Global
Rating
(10 max)
5
5
9
6
7
9
6
7
6
6
5
5
4
5
4
7
4
5
6
5
6
  • 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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